Qashqai J11. Heater & Air conditioning Control System - part 1

 

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Qashqai J11. Heater & Air conditioning Control System - part 1

 

 

HAC-1

VENTILATION, HEATER & AIR CONDITIONER

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SECTION 

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HAC

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CONTENTS

HEATER & AIR CONDITIONING CONTROL SYSTEM

AUTOMATIC AIR CONDITIONING

PRECAUTION ...............................................

7

PRECAUTIONS ...................................................

7

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
..

7

Precautions for Removing Battery Terminal  .............

7

SYSTEM DESCRIPTION  ..............................

9

COMPONENT PARTS  ........................................

9

AUTOMATIC AIR CONDITIONING SYSTEM  .............

9

AUTOMATIC AIR CONDITIONING SYSTEM : 
Component Parts Location ......................................
..

9

PTC HEATER CONTROL SYSTEM ..........................

10

PTC HEATER CONTROL SYSTEM : Component 
Parts Location  .........................................................

11

STOP/START SYSTEM .............................................

12

STOP/START SYSTEM : Component Parts Loca-
tion ..........................................................................

13

A/C UNIT ASSEMBLY ...............................................

14

A/C UNIT ASSEMBLY : Aspirator ...........................

14

A/C UNIT ASSEMBLY : Intake Sensor  ...................

14

A/C UNIT ASSEMBLY : Air Mix Door Motor (Driver 
Side) ........................................................................

14

A/C UNIT ASSEMBLY : Air Mix Door Motor (Pas-
senger Side) ............................................................

15

A/C UNIT ASSEMBLY : Mode Door Motor  .............

15

A/C UNIT ASSEMBLY : Intake Door Motor .............

16

A/C UNIT ASSEMBLY : Blower Motor  ....................

17

A/C UNIT ASSEMBLY : Power Transistor ..............

17

A/C UNIT ASSEMBLY : PTC Heater  ......................

17

COMPRESSOR .........................................................

18

COMPRESSOR : Magnet Clutch  ............................

18

COMPRESSOR : ECV (Electrical Control Valve) ....

18

A/C Control ..............................................................

18

A/C Auto Amp. .........................................................

19

Ambient Sensor  .......................................................

19

In-vehicle Sensor .....................................................

19

Sunload Sensor  .......................................................

19

Refrigerant Pressure Sensor  ...................................

19

SYSTEM ............................................................

21

AUTOMATIC AIR CONDITIONING SYSTEM  ...........

21

AUTOMATIC AIR CONDITIONING SYSTEM : 
System Description ..................................................

21

AUTOMATIC AIR CONDITIONING SYSTEM : 
Temperature Control  ...............................................

22

AUTOMATIC AIR CONDITIONING SYSTEM : Air 
Outlet Control  ..........................................................

23

AUTOMATIC AIR CONDITIONING SYSTEM : Air 
Flow Control  ............................................................

23

AUTOMATIC AIR CONDITIONING SYSTEM : Air 
Inlet Control  .............................................................

24

AUTOMATIC AIR CONDITIONING SYSTEM : 
Compressor Control  ................................................

24

AUTOMATIC AIR CONDITIONING SYSTEM : 
Door Control  ............................................................

25

AUTOMATIC AIR CONDITIONING SYSTEM : 
Cooling Fan Control .................................................

29

AUTOMATIC AIR CONDITIONING SYSTEM : 
Door Motor Starting Position Reset Control  ............

30

AUTOMATIC AIR CONDITIONING SYSTEM : 
Fail-safe ...................................................................

31

PTC HEATER CONTROL SYSTEM  ..........................

31

PTC HEATER CONTROL SYSTEM : System De-
scription ...................................................................

31

STOP/START SYSTEM  .............................................

31

STOP/START SYSTEM : System Description  ........

32

OPERATION .....................................................

34

Switch Name and Function ......................................

34

DIAGNOSIS SYSTEM (A/C AUTO AMP.)  ........

42

Description ...............................................................

42

HAC-2

CONSULT Function ................................................

42

DIAGNOSIS SYSTEM (A/C CONTROL)  ...........

45

Diagnosis Description  .............................................

45

DIAGNOSIS SYSTEM (BCM)  ............................

46

COMMON ITEM  ........................................................

46

COMMON ITEM : CONSULT Function (BCM - 
COMMON ITEM)  ...................................................
.

46

AIR CONDITIONER  ..................................................

47

AIR CONDITIONER : CONSULT Function (BCM - 
AIR CONDITIONER)  .............................................
.

47

ECU DIAGNOSIS INFORMATION ..............

48

A/C AUTO AMP.  ................................................

48

Reference Value  .....................................................

48

Fail-safe ..................................................................

53

DTC Index  ..............................................................

53

BCM, ECM, IPDM E/R  .......................................

55

List of ECU Reference  ............................................

55

WIRING DIAGRAM  .....................................

56

AUTOMATIC AIR CONDITIONING SYSTEM ...

56

Wiring Diagram  .......................................................

56

BASIC INSPECTION ...................................

68

DIAGNOSIS AND REPAIR WORK FLOW  ........

68

Work Flow ...............................................................

68

OPERATION INSPECTION ...............................

71

Work Procedure ......................................................

71

SYSTEM SETTING ............................................

75

Temperature Setting Trimmer  ................................

75

Inlet Port Memory Function (REC)  .........................

75

Inlet Port Memory Function (FRE)  ..........................

76

Setting of Target Evaporator Temperature Upper 
Limit Value  .............................................................
.

76

DOOR MOTOR STARTING POSITION RE-
SET ....................................................................

78

Description ..............................................................

78

Work Procedure ......................................................

78

DTC/CIRCUIT DIAGNOSIS .........................

79

U1000 CAN COMM CIRCUIT  ............................

79

Description ..............................................................

79

DTC Logic ...............................................................

79

Diagnosis Procedure  ..............................................

79

B24A0 A/C AUTO AMP.  ....................................

80

DTC Logic ...............................................................

80

Diagnosis Procedure  ..............................................

80

B24A1 A/C AUTO AMP. POWER SUPPLY  ......

81

DTC Logic ...............................................................

81

Diagnosis Procedure ...............................................

81

B24A4 INTAKE SENSOR  .................................

82

DTC Logic  ...............................................................

82

Diagnosis Procedure ...............................................

82

Component Inspection  ............................................

84

B24A6 IN-VEHICLE SENSOR  ..........................

85

DTC Logic  ...............................................................

85

Diagnosis Procedure ...............................................

85

Component Inspection  ............................................

87

B24A9 SUNLOAD SENSOR  .............................

88

DTC Logic  ...............................................................

88

Diagnosis Procedure ...............................................

88

B24B4 A/C CONTROL  ......................................

91

DTC Logic  ...............................................................

91

Diagnosis Procedure ...............................................

91

B24B7 INTAKE DOOR MOTOR  .......................

92

DTC Logic  ...............................................................

92

Diagnosis Procedure ...............................................

92

Component Inspection  ............................................

94

B24B9 MODE DOOR MOTOR  ..........................

95

DTC Logic  ...............................................................

95

Diagnosis Procedure ...............................................

95

Component Inspection  ............................................

97

B24BB LEFT AIR MIX DOOR MOTOR .............

98

DTC Logic  ...............................................................

98

Diagnosis Procedure ...............................................

98

Component Inspection  ..........................................

100

B24BD RIGHT AIR MIX DOOR MOTOR  .........

101

DTC Logic  .............................................................

101

Diagnosis Procedure .............................................

101

Component Inspection  ..........................................

103

B24D4 A/C CONTROL COMMUNICATION .....

104

DTC Logic  .............................................................

104

Diagnosis Procedure .............................................

104

POWER SUPPLY AND GROUND CIRCUIT  ....

106

A/C AUTO AMP. ......................................................

106

A/C AUTO AMP. : Diagnosis Procedure  ...............

106

A/C CONTROL  ........................................................

106

A/C CONTROL : Diagnosis Procedure  .................

106

BLOWER MOTOR ............................................

108

Diagnosis Procedure .............................................

108

Component Inspection (Blower Motor)  .................

110

Component Inspection (Blower Relay)  .................

111

MAGNET CLUTCH  ...........................................

112

Component Function Check  .................................

112

Diagnosis Procedure .............................................

112

ECV (ELECTRICAL CONTROL VALVE)  .........

114

Diagnosis Procedure .............................................

114

HAC-3

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HAC

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Component Inspection  ..........................................

114

PTC HEATER  ...................................................

116

Component Function Check ..................................

116

Diagnosis Procedure .............................................

116

Component Inspection (PTC Relay)  .....................

117

Component Inspection (PTC Heater)  ....................

118

SYMPTOM DIAGNOSIS  ............................

119

AUTOMATIC AIR CONDITIONER SYSTEM  ...

119

Symptom Table  .....................................................

119

INSUFFICIENT COOLING  ...............................

121

Description ............................................................

121

Diagnosis Procedure .............................................

121

INSUFFICIENT HEATING  ................................

123

Description ............................................................

123

Diagnosis Procedure .............................................

123

COMPRESSOR DOES NOT OPERATE  ..........

125

Description ............................................................

125

Diagnosis Procedure .............................................

125

REMOVAL AND INSTALLATION .............

126

A/C CONTROL  .................................................

126

Exploded View  ......................................................

126

Removal and Installation .......................................

126

A/C AUTO AMP. ...............................................

127

Removal and Installation .......................................

127

AMBIENT SENSOR  .........................................

128

Removal and Installation .......................................

128

IN-VEHICLE SENSOR  .....................................

129

Removal and Installation .......................................

129

SUNLOAD SENSOR  ........................................

130

Removal and Installation .......................................

130

INTAKE SENSOR  ............................................

131

Exploded View  ......................................................

131

Removal and Installation .......................................

131

REFRIGERANT PRESSURE SENSOR  ...........

132

Exploded View  ......................................................

132

Removal and Installation .......................................

132

PTC HEATER  ...................................................

133

Removal and Installation .......................................

133

POWER TRANSISTOR  ....................................

134

Exploded View  ......................................................

134

Removal and Installation .......................................

134

DOOR MOTOR .................................................

135

Exploded View  ......................................................

135

AIR MIX DOOR MOTOR  .........................................

136

AIR MIX DOOR MOTOR : Removal and Installa-
tion .........................................................................

136

INTAKE DOOR MOTOR  ..........................................

137

INTAKE DOOR MOTOR : Removal and Installa-
tion .........................................................................

137

MODE DOOR MOTOR .............................................

138

MODE DOOR MOTOR : Removal and Installation ..

138

MANUAL AIR CONDITIONING

PRECAUTION ............................................

139

PRECAUTIONS ...............................................

139

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...............................................................

139

Precautions for Removing Battery Terminal ..........

139

SYSTEM DESCRIPTION  ...........................

141

COMPONENT PARTS  ....................................

141

MANUAL AIR CONDITIONING SYSTEM  ...............

141

MANUAL AIR CONDITIONING SYSTEM : Com-
ponent Parts Location ............................................

141

PTC HEATER CONTROL SYSTEM  ........................

142

PTC HEATER CONTROL SYSTEM : Component 
Parts Location ........................................................

143

A/C UNIT ASSEMBLY  .............................................

144

A/C UNIT ASSEMBLY : Intake Sensor ..................

144

A/C UNIT ASSEMBLY : Air Mix Door Motor ..........

144

A/C UNIT ASSEMBLY : Mode Door Motor ............

145

A/C UNIT ASSEMBLY : Intake Door Motor  ...........

145

A/C UNIT ASSEMBLY : Blower Motor ...................

146

A/C UNIT ASSEMBLY : Fan Control Amp. ............

146

A/C UNIT ASSEMBLY : PTC Heater .....................

147

COMPRESSOR ........................................................

147

COMPRESSOR : Magnet Clutch ..........................

147

COMPRESSOR : ECV (Electrical Control Valve) ..

147

A/C Control (A/C Amp.)  .........................................

148

Ambient Sensor  .....................................................

148

Refrigerant Pressure Sensor  .................................

148

SYSTEM ..........................................................

149

MANUAL AIR CONDITIONING SYSTEM  ...............

149

MANUAL AIR CONDITIONING SYSTEM : Sys-
tem Description ......................................................

149

MANUAL AIR CONDITIONING SYSTEM : Air In-
let Control  ..............................................................

150

MANUAL AIR CONDITIONING SYSTEM : Com-
pressor Control  ......................................................

150

MANUAL AIR CONDITIONING SYSTEM : Door 
Control ...................................................................

151

MANUAL AIR CONDITIONING SYSTEM : Cool-
ing Fan Control  ......................................................

155

MANUAL AIR CONDITIONING SYSTEM : Door 
Motor Starting Position Reset Control  ...................

156

HAC-4

PTC HEATER CONTROL SYSTEM ........................

156

PTC HEATER CONTROL SYSTEM : System De-
scription .................................................................

157

OPERATION ....................................................

158

Switch Name and Function ....................................

158

DIAGNOSIS SYSTEM (A/C AMP.)  ..................

162

Description .............................................................

162

CONSULT Function ...............................................

162

DIAGNOSIS SYSTEM (BCM)  ..........................

164

COMMON ITEM  .......................................................

164

COMMON ITEM : CONSULT Function (BCM - 
COMMON ITEM)  ...................................................

164

AIR CONDITIONER  .................................................

165

AIR CONDITIONER : CONSULT Function (BCM - 
AIR CONDITIONER)  .............................................

165

ECU DIAGNOSIS INFORMATION .............

166

A/C AMP.  .........................................................

166

Reference Value  ....................................................

166

DTC Index  .............................................................

169

BCM, ECM, IPDM E/R  .....................................

170

List of ECU Reference  ...........................................

170

WIRING DIAGRAM  ....................................

171

MANUAL AIR CONDITIONER SYSTEM .........

171

Wiring Diagram  ......................................................

171

BASIC INSPECTION ..................................

182

DIAGNOSIS AND REPAIR WORK FLOW  ......

182

Work Flow ..............................................................

182

OPERATION INSPECTION .............................

185

Work Procedure .....................................................

185

SYSTEM SETTING ..........................................

187

Setting of Target Evaporator Temperature Upper 
Limit Value  .............................................................

187

DOOR MOTOR STARTING POSITION RE-
SET ..................................................................

188

Description .............................................................

188

Work Procedure .....................................................

188

DTC/CIRCUIT DIAGNOSIS ........................

189

U1000 CAN COMM CIRCUIT  ..........................

189

Description .............................................................

189

DTC Logic ..............................................................

189

Diagnosis Procedure  .............................................

189

U1010 CONTROL UNIT (CAN)  .......................

190

Description .............................................................

190

DTC Logic ..............................................................

190

Diagnosis Procedure  .............................................

190

B24A4 INTAKE SENSOR  ................................

191

DTC Logic  .............................................................

191

Diagnosis Procedure .............................................

191

Component Inspection  ..........................................

193

B24B7 INTAKE DOOR MOTOR  ......................

194

DTC Logic  .............................................................

194

Diagnosis Procedure .............................................

194

Component Inspection  ..........................................

196

B24B9 MODE DOOR MOTOR  .........................

197

DTC Logic  .............................................................

197

Diagnosis Procedure .............................................

197

Component Inspection  ..........................................

199

B24BB LEFT AIR MIX DOOR MOTOR ............

200

DTC Logic  .............................................................

200

Diagnosis Procedure .............................................

200

Component Inspection  ..........................................

202

POWER SUPPLY AND GROUND CIRCUIT  ....

203

A/C AMP.  .................................................................

203

A/C AMP. : Diagnosis Procedure ..........................

203

BLOWER MOTOR ............................................

204

Diagnosis Procedure .............................................

204

Component Inspection (Blower Motor)  .................

207

Component Inspection (Blower Relay)  .................

207

Component Inspection (Fan Control Amp.)  ..........

207

MAGNET CLUTCH  ...........................................

209

Component Function Check  .................................

209

Diagnosis Procedure .............................................

209

ECV (ELECTRICAL CONTROL VALVE)  .........

211

Diagnosis Procedure .............................................

211

Component Inspection  ..........................................

211

PTC HEATER  ...................................................

213

Component Function Check  .................................

213

Diagnosis Procedure .............................................

213

Component Inspection (PTC Relay)  .....................

214

Component Inspection (PTC Heater) ....................

215

SYMPTOM DIAGNOSIS  ...........................

216

MANUAL AIR CONDITIONING SYSTEM  ........

216

Symptom Table .....................................................

216

INSUFFICIENT COOLING ................................

218

Description ............................................................

218

Diagnosis Procedure .............................................

218

INSUFFICIENT HEATING  ................................

219

Description ............................................................

219

Diagnosis Procedure .............................................

219

COMPRESSOR DOES NOT OPERATE  ..........

221

Description ............................................................

221

Diagnosis Procedure .............................................

221

HAC-5

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HAC

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REMOVAL AND INSTALLATION .............

222

A/C CONTROL (A/C AUTO AMP.)  ..................

222

Exploded View  ......................................................

222

Removal and Installation .......................................

222

AMBIENT SENSOR  .........................................

223

Removal and Installation .......................................

223

INTAKE SENSOR  ............................................

224

Exploded View  ......................................................

224

Removal and Installation .......................................

224

REFRIGERANT PRESSURE SENSOR  ...........

225

Exploded View  ......................................................

225

Removal and Installation .......................................

225

PTC HEATER  ...................................................

226

Removal and Installation .......................................

226

FAN CONTROL AMPLIFIER  ...........................

227

Exploded View  ......................................................

227

Removal and Installation .......................................

227

DOOR MOTOR .................................................

228

Exploded View  ......................................................

228

AIR MIX DOOR MOTOR  .........................................

229

AIR MIX DOOR MOTOR : Removal and Installa-
tion ........................................................................

229

INTAKE DOOR MOTOR ..........................................

230

INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................

230

MODE DOOR MOTOR  ............................................

230

MODE DOOR MOTOR : Removal and Installation 

..

230

MANUAL HEATER 

PRECAUTION ............................................

231

PRECAUTIONS ................................................

231

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...............................................................

231

Precautions for Removing Battery Terminal  .........

231

SYSTEM DESCRIPTION  ...........................

233

COMPONENT PARTS  .....................................

233

MANUAL HEATER SYSTEM  ..................................

233

MANUAL HEATER SYSTEM : Component Parts 
Location .................................................................

233

PTC HEATER CONTROL SYSTEM ........................

234

PTC HEATER CONTROL SYSTEM : Component 
Parts Location  .......................................................

235

A/C UNIT ASSEMBLY .............................................

236

A/C UNIT ASSEMBLY : Air Mix Door Motor  .........

236

A/C UNIT ASSEMBLY : Mode Door Motor  ...........

236

A/C UNIT ASSEMBLY : Intake Door Motor ...........

237

A/C UNIT ASSEMBLY : Blower Motor ...................

237

A/C UNIT ASSEMBLY : Fan Control Amp. ............

238

A/C UNIT ASSEMBLY : PTC Heater .....................

238

Heater Control (A/C Amp.)  ....................................

238

Ambient Sensor  .....................................................

239

SYSTEM ..........................................................

240

MANUAL HEATER SYSTEM  ..................................

240

MANUAL HEATER SYSTEM : System Descrip-
tion .........................................................................

240

MANUAL HEATER SYSTEM : Air Inlet Control  ....

240

MANUAL HEATER SYSTEM : Door Control .........

241

MANUAL HEATER SYSTEM : Door Motor Start-
ing Position Reset Control  .....................................

243

PTC HEATER CONTROL SYSTEM  ........................

243

PTC HEATER CONTROL SYSTEM : System De-
scription .................................................................

243

OPERATION ...................................................

245

Switch Name and Function ....................................

245

DIAGNOSIS SYSTEM (A/C AMP.)  .................

246

Description .............................................................

246

CONSULT Function ...............................................

246

DIAGNOSIS SYSTEM (BCM)  .........................

248

COMMON ITEM  .......................................................

248

COMMON ITEM : CONSULT Function (BCM - 
COMMON ITEM)  ...................................................

248

AIR CONDITIONER  .................................................

249

AIR CONDITIONER : CONSULT Function (BCM - 
AIR CONDITIONER)  .............................................

249

ECU DIAGNOSIS INFORMATION ............

250

A/C AMP. .........................................................

250

Reference Value ....................................................

250

DTC Index  .............................................................

252

BCM, ECM, IPDM E/R .....................................

253

List of ECU Reference ...........................................

253

WIRING DIAGRAM  ....................................

254

MANUAL HEATER SYSTEM ..........................

254

Wiring Diagram ......................................................

254

BASIC INSPECTION  .................................

261

DIAGNOSIS AND REPAIR WORK FLOW  .....

261

Work Flow ..............................................................

261

OPERATION INSPECTION  ............................

264

Work Procedure .....................................................

264

DOOR MOTOR STARTING POSITION RE-
SET ..................................................................

266

Description .............................................................

266

Work Procedure .....................................................

266

HAC-6

DTC/CIRCUIT DIAGNOSIS ........................

267

U1000 CAN COMM CIRCUIT  ..........................

267

Description .............................................................

267

DTC Logic ..............................................................

267

Diagnosis Procedure  .............................................

267

U1010 CONTROL UNIT (CAN)  .......................

268

Description .............................................................

268

DTC Logic ..............................................................

268

Diagnosis Procedure  .............................................

268

B24B7 INTAKE DOOR MOTOR ......................

269

DTC Logic ..............................................................

269

Diagnosis Procedure  .............................................

269

Component Inspection ...........................................

271

B24B9 MODE DOOR MOTOR  ........................

272

DTC Logic ..............................................................

272

Diagnosis Procedure  .............................................

272

Component Inspection ...........................................

274

B24BB LEFT AIR MIX DOOR MOTOR  ...........

275

DTC Logic ..............................................................

275

Diagnosis Procedure  .............................................

275

Component Inspection ...........................................

277

POWER SUPPLY AND GROUND CIRCUIT  ...

278

A/C AMP. ..................................................................

278

A/C AMP. : Diagnosis Procedure  ..........................

278

BLOWER MOTOR  ...........................................

279

Diagnosis Procedure  .............................................

279

Component Inspection (Blower Motor)  ..................

282

Component Inspection (Blower Relay)  ..................

282

Component Inspection (Fan Control Amp.)  ...........

282

PTC HEATER  ..................................................

284

Component Function Check  ..................................

284

Diagnosis Procedure  .............................................

284

Component Inspection (PTC Relay)  .....................

285

Component Inspection (PTC Heater) ....................

286

SYMPTOM DIAGNOSIS  ...........................

287

MANUAL HEATER SYSTEM  ...........................

287

Symptom Table .....................................................

287

INSUFFICIENT HEATING  ................................

288

Description ............................................................

288

Diagnosis Procedure .............................................

288

REMOVAL AND INSTALLATION .............

289

HEATER CONTROL (A/C AMP.)  .....................

289

Exploded View  ......................................................

289

Removal and Installation .......................................

289

AMBIENT SENSOR ..........................................

290

Removal and Installation .......................................

290

PTC HEATER  ...................................................

291

Removal and Installation .......................................

291

FAN CONTROL AMPLIFIER ............................

292

Exploded View  ......................................................

292

Removal and Installation .......................................

292

DOOR MOTOR  .................................................

293

Exploded View  ......................................................

293

AIR MIX DOOR MOTOR  .........................................

294

AIR MIX DOOR MOTOR : Removal and Installa-
tion ........................................................................

294

INTAKE DOOR MOTOR  .........................................

295

INTAKE DOOR MOTOR : Removal and Installa-
tion ........................................................................

295

MODE DOOR MOTOR  ............................................

295

MODE DOOR MOTOR : Removal and Installation .

295

PRECAUTIONS

HAC-7

< PRECAUTION >

[AUTOMATIC AIR CONDITIONING]

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PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000010432151

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the “SRS AIR BAG” and
“SEAT BELT” of this Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precautions for Removing Battery Terminal

INFOID:0000000010521162

• With the adoption of Auto ACC function, ACC power is automatically supplied by operating the intelligent key

or remote keyless entry or by opening/closing the driver side door. In addition, ACC power is supplied even
after the ignition switch is turned to the OFF position, i.e. ACC power is supplied for a certain fixed time.

• When disconnecting the 12V battery terminal, turn off the ACC

power before disconnecting the 12V battery terminal, observing
“How to disconnect 12V battery terminal” described below.
NOTE:
Some ECUs operate for a certain fixed time even after ignition
switch is turned OFF and ignition power supply is stopped. If the
battery terminal is disconnected before ECU stops, accidental DTC
detection or ECU data damage may occur.

•  For vehicles with the 2-batteries, be sure to connect the main bat-

tery and the sub battery before turning ON the ignition switch.
NOTE:
If the ignition switch is turned ON with any one of the terminals of
main battery and sub battery disconnected, then DTC may be detected.

•  After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC.

NOTE:
The removal of 12V battery may cause a DTC detection error.

HOW TO DISCONNECT 12V BATTERY TERMINAL

Disconnect 12V battery terminal according to instruction described below.
1.

Open the hood.

2.

Turn ignition switch to the ON position.

3.

Turn ignition switch to the OFF position with the driver side door opened.

4.

Get out of the vehicle and close the driver side door.

SEF289H

HAC-8

< PRECAUTION >

[AUTOMATIC AIR CONDITIONING]

PRECAUTIONS

5.

Wait at least 3 minutes. For vehicle with the engine listed below, remove the battery terminal after a lapse
of the specified time.

CAUTION:

While waiting, never operate the vehicle such as locking, opening, and closing doors. Violation of
this caution results in the activation of ACC power supply according to the Auto ACC function.

6.

Remove 12V battery terminal.

CAUTION:

After installing 12V battery, always check self-diagnosis results of all ECUs and erase DTC.

D4D engine

: 20 minutes

HRA2DDT

: 12 minutes

K9K engine

: 4 minutes

M9R engine

: 4 minutes

R9M engine

: 4 minutes

V9X engine

: 4 minutes

COMPONENT PARTS

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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SYSTEM DESCRIPTION

COMPONENT PARTS

AUTOMATIC AIR CONDITIONING SYSTEM

AUTOMATIC AIR CONDITIONING SYSTEM : Component Parts Location

INFOID:0000000010432153

Left side of A/C unit assembly

Right side of A/C unit assembly

JMIIA3541ZZ

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

PTC HEATER CONTROL SYSTEM

No.

Component

Function

Compressor

Magnet clutch

HAC-18, "COMPRESSOR : Magnet Clutch"

ECV (electrical control 
valve)

HAC-18, "COMPRESSOR : ECV (Electrical Control Valve)"

Refrigerant pressure sensor

HAC-19, "Refrigerant Pressure Sensor"

Ambient sensor

HAC-19, "Ambient Sensor"

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when 
receiving A/C compressor request signal from ECM via CAN communica-
tion line.
Refer to 

PCS-5, "Component Parts Location"

 for detailed installation loca-

tion.

ECM

ECM, when receiving A/C ON signal and blower fan ON signal from BCM, 
transmits A/C compressor request signal to IPDM E/R via CAN communi-
cation according to status of the engine and refrigerant pressure.
ECM transmits engine coolant temperature signal to combination meter via 
CAN communication line.
Refer to 

ECH-13, "Component Parts Location"

 (HR engine models), 

ECM-

25, "ENGINE CONTROL SYSTEM : Component Parts Location"

 

(MR16DDT engine models), 

ECM-627, "ENGINE CONTROL SYSTEM : 

Component Parts Location"

 (MR20DD engine models), 

ECK-12, "Compo-

nent Parts Location"

 (K9K engine models) or 

EC9-14, "Component Parts 

Location"

 (R9M engine models) for detailed installation location.

Sunload sensor

HAC-19, "Sunload Sensor"

In-vehicle sensor

HAC-19, "In-vehicle Sensor"

Combination meter

Combination meter transmits ambient temperature signal and vehicle 
speed signal to A/C auto amp. via CAN communication line.

A/C control

HAC-18, "A/C Control"

Power transistor

HAC-17, "A/C UNIT ASSEMBLY : Power Transistor"

Intake sensor

HAC-14, "A/C UNIT ASSEMBLY : Intake Sensor"

Air mix door motor (Driver side)

HAC-14, "A/C UNIT ASSEMBLY : Air Mix Door Motor (Driver Side)"

Aspirator

HAC-14, "A/C UNIT ASSEMBLY : Aspirator"

Intake door motor

HAC-16, "A/C UNIT ASSEMBLY : Intake Door Motor"

A/C auto amp.

HAC-19, "A/C Auto Amp."

Air mix door motor (Passenger side)

HAC-15, "A/C UNIT ASSEMBLY : Air Mix Door Motor (Passenger Side)"

Mode door motor

HAC-15, "A/C UNIT ASSEMBLY : Mode Door Motor"

Blower motor

HAC-17, "A/C UNIT ASSEMBLY : Blower Motor"

COMPONENT PARTS

HAC-11

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[AUTOMATIC AIR CONDITIONING]

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PTC HEATER CONTROL SYSTEM : Component Parts Location

INFOID:0000000010499384

Right side of A/C unit assembly

JMIIA3545ZZ

No.

Component

Function

Ambient sensor

HAC-19, "Ambient Sensor"

PTC relay-1/2/3

PTC relay is controlled by BCM, and supplies power supply to PTC heater.

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

STOP/START SYSTEM

ECM

ECM transmits engine speed signal, engine coolant temperature signal, 
cooling fan speed request signal, and electrical power cut freeze signal to 
BCM via CAN communication line.
Refer to 

ECH-13, "Component Parts Location"

 (HR engine models), 

ECM-

25, "ENGINE CONTROL SYSTEM : Component Parts Location"

 

(MR16DDT engine models), 

ECM-627, "ENGINE CONTROL SYSTEM : 

Component Parts Location"

 (MR20DD engine models), 

ECK-12, "Compo-

nent Parts Location"

 (K9K engine models) or 

EC9-14, "Component Parts Lo-

cation"

 (R9M engine models) for detailed installation location.

Combination meter

Combination meter transmits ambient temperature signal to BCM via CAN 
communication line.

BCM

BCM receives each signals, and controls PTC relay.
BCM transmits idle up signal to ECM according to electrical load condition.
Refer to 

BCS-6, "BODY CONTROL SYSTEM : Component Parts Location"

 

for detailed installation location.

PTC heater

HAC-17, "A/C UNIT ASSEMBLY : PTC Heater"

Blower motor

HAC-17, "A/C UNIT ASSEMBLY : Blower Motor"

No.

Component

Function

COMPONENT PARTS

HAC-13

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[AUTOMATIC AIR CONDITIONING]

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STOP/START SYSTEM : Component Parts Location

INFOID:0000000010499374

Left side of A/C unit assembly

Right side of A/C unit assembly

JMIIA3544ZZ

HAC-14

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

A/C UNIT ASSEMBLY

A/C UNIT ASSEMBLY : Aspirator

INFOID:0000000010432154

The aspirator generates the vacuum by the air blown from the A/C
unit assembly and draws the air of the passenger room to the in-
vehicle sensor area via the aspirator duct.

A/C UNIT ASSEMBLY : Intake Sensor

INFOID:0000000010432155

Intake sensor measures evaporator temperature (through air tem-
perature). The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

A/C UNIT ASSEMBLY : Air Mix Door Motor (Driver Side)

INFOID:0000000010432156

DESCRIPTION

No.

Component

Function

Ambient sensor

Refer to 

HAC-19, "Ambient Sensor"

.

ECM

ECM transmits engine coolant temperature signal and stop/start status sig-
nal to A/C auto amp. via CAN communication line.
ECM receives stop/start permit signal from A/C auto amp. via CAN commu-
nication line.
Refer to 

ECH-13, "Component Parts Location"

 (HR engine models), 

ECM-

25, "ENGINE CONTROL SYSTEM : Component Parts Location"

 

(MR16DDT engine models), 

ECK-12, "Component Parts Location"

 (K9K 

engine models) or 

EC9-14, "Component Parts Location"

 (R9M engine 

models) for detailed installation location.

Sunload sensor

HAC-19, "Sunload Sensor"

In-vehicle sensor

HAC-19, "In-vehicle Sensor"

Combination meter

Combination meter transmits ambient temperature signal to A/C auto amp. 
via CAN communication line.

A/C control

HAC-18, "A/C Control"

Power transistor

HAC-17, "A/C UNIT ASSEMBLY : Power Transistor"

Intake sensor

HAC-14, "A/C UNIT ASSEMBLY : Intake Sensor"

Intake door motor

HAC-16, "A/C UNIT ASSEMBLY : Intake Door Motor"

A/C auto amp.

HAC-19, "A/C Auto Amp."

Blower motor

HAC-17, "A/C UNIT ASSEMBLY : Blower Motor"

RJIA1804E

JMIIA3561GB

COMPONENT PARTS

HAC-15

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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• The step motor system is adopted for air mix door motor (driver side).
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position.

• Rotation of motor is transmitted to air mix door (driver side) by link and lever, then air flow temperature

(driver side) is switched.

AIR MIX DOOR MOTOR (DRIVER SIDE) DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

A/C UNIT ASSEMBLY : Air Mix Door Motor (Passenger Side)

INFOID:0000000010432157

DESCRIPTION

• The step motor system is adopted for air mix door motor (passenger side).
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position.

• Rotation of motor is transmitted to air mix door (passenger side) by link and lever, then air flow temperature

(passenger side) is switched.

AIR MIX DOOR MOTOR (PASSENGER SIDE) DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

A/C UNIT ASSEMBLY : Mode Door Motor

INFOID:0000000010432158

DESCRIPTION

• The step motor system is adopted for mode door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position.

JMIIA3562GB

JMIIA3563GB

HAC-16

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

• Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side

ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.

MODE DOOR MOTOR DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

A/C UNIT ASSEMBLY : Intake Door Motor

INFOID:0000000010432159

DESCRIPTION

• The step motor system is adopted for intake door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates

according to the drive signal, and then stops at the target door position.

• Rotation of motor is transmitted to intake door by lever, then air inlet is switched.

INTAKE DOOR MOTOR (DRIVER SIDE) DRIVE METHOD

• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.

JMIIA3564GB

JMIIA3565GB

 

 

 

 

 

 

 

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