Nissan Qashqai J11. Manual - part 1153

HAC-248

< SYSTEM DESCRIPTION >

[MANUAL HEATER ]

SYSTEM

• When PTC relay turns ON, power supply is supplied to PTC heater. Heating element is heated and air flow

temperature is increased. Heating is available for a period of time until engine coolant temperature is
increased when engine starts cold in cold climate.

• Idle up request signal is transmitted from BCM to ECM while PTC heater operates. Idle speed is increased,

warming-up is facilitated, and battery electric power is obtained.

• Electric power supplied to PTC heating element is subject to PTC relay control conditions. 

NOTE:
PTC heater operation depends on ambient temperature and battery voltage. PTC heater is ON when ambient
temperature is 8

°

C or less. PTC heater is OFF when ambient temperature is 12

°

C (53.6

°

F) or more. PTC

heater is ON when battery voltage is 11.5 V or more. PTC heater is OFF when battery voltage is 11 V or less.

PTC heater

Operation

PTC relay-1

PTC relay-2

PTC relay-3

Electric power (W)

OFF

OFF

OFF

OFF

OFF

Approx. 0

PTC heater-1

LOW

ON

OFF

OFF

Approx. 333

PTC heater-2

MID

ON

ON

OFF

Approx. 666

PTC heater-3

HI

ON

ON

ON

Approx. 999

OPERATION

HAC-249

< SYSTEM DESCRIPTION >

[MANUAL HEATER ]

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OPERATION

Switch Name and Function

INFOID:0000000010433415

OPERATION AND DISPLAY OF AUTOMATIC AIR CONDITIONING SYSTEM

Operation: Heater control

MODE D/F switch

MODE FOOT switch

MODE B/L switch

MODE VENT switch

Fan control dial

MODE DEF switch

INTAKE switch

Temperature control dial

Switch name

Function

INTAKE switch

Air inlet changes between recirculation (REC) 

⇔

 fresh air intake (FRE) each time this switch is pressed.

• Switch indicator lamp ON: Recirculation
• Switch indicator lamp OFF: Fresh air intake

Fan control dial

The air flow can be manually set within the range of speeds 1st - 24th by operating the dial.

Temperature control 
dial

The air flow temperature can be adjusted by operating the dial.
• Clockwise: Raise the air flow temperature.
• Counterclockwise: Lower the air flow temperature.

MODE VENT switch

• Air outlet mode is changed by pushing these switches.
• When MODE D/F switch or MODE DEF switch is pushed, air inlet is changed to fresh air intake (FRE)
• When MODE DEF switch is pushed while air outlet is set on DEF position, air outlet mode is controlled 

to setting before air outlet is set to DEF position. 

MODE B/L switch

MODE FOOT switch

MODE D/F switch

MODE DEF switch

JMIIA3581ZZ

HAC-250

< SYSTEM DESCRIPTION >

[MANUAL HEATER ]

DIAGNOSIS SYSTEM (A/C AMP.)

DIAGNOSIS SYSTEM (A/C AMP.)

Description

INFOID:0000000010433416

Air conditioning system performs self-diagnosis, operation check, function diagnosis, and various settings
using diagnosis function of each control unit.

CONSULT Function

INFOID:0000000010433417

CONSULT performs the following functions via CAN communication with A/C amp. 

NOTE:
Diagnosis should be performed with engine running. Door motor operation speeds become slower and NO
results may be returned even for normal operation if battery voltage drops below 12 V during self-diagnosis. 

ECU IDENTIFICATION

Part number of A/C amp. can be checked.

SELF-DIAGNOSIS RESULTS

Diagnosis result that is judged by A/C amp. can be checked. Refer to 

HAC-256, "DTC Index"

.

DATA MONITOR

Input/output signal of A/C amp. can be checked.
NOTE:
The following table includes information (items) inapplicable to this vehicle. For information (items) applicable
to this vehicle, refer to CONSULT display items.

Display item list

ECU

Diagnostic item

(CONSULT)

A/C amp.

HVAC

Self Diagnostic Result

Data Monitor

Active Test

Work support

BCM

BCM-AIR CONDITIONER

Self Diagnostic Result

Data Monitor

ECM

ENGINE

Self Diagnostic Result

Data Monitor

Diagnostic mode

Description

Ecu Identification

Displays the part number of A/C amp. 

Self Diagnostic Result

Displays the diagnosis results judged by A/C amp. 

Data Monitor

Displays the input/output signal of A/C amp. 

Active Test

The signals used to activate each device are forcibly supplied from A/C amp. 

Work support

Changes the setting for each setting function and performs automatic adjustment of 
components.

Monitor item [Unit]

Description

AMB TEMP SEN

[

°

C (

°

F)]

Ambient temperature value converted from ambient temperature signal received from 
combination meter via CAN communication.

INT TEMP SEN

[

°

C (

°

F)]

NOTE:
This item is indicated, but not monitored.

AMB SEN CAL

[

°

C (

°

F)]

Ambient temperature value calculated by A/C amp.

INT TEMP CAL

[

°

C (

°

F)]

NOTE:
This item is indicated, but not monitored.

COMP REQ SIG

[On/Off]

NOTE:
This item is indicated, but not monitored.

DIAGNOSIS SYSTEM (A/C AMP.)

HAC-251

< SYSTEM DESCRIPTION >

[MANUAL HEATER ]

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ACTIVE TEST

The signals used to activate each device forcibly supplied from A/C amp. operation check of air conditioning
system can be performed.

Check each output device

NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operated. 

WORK SUPPORT

Setting change of each setting functions and automatic adjustment of components can be performed.

COMP ECV DUTY

[%]

NOTE:
This item is indicated, but not monitored.

FAN REQ SIG

[On/Off]

Displays blower fan ON signal ON/OFF status transmitted to ECM.

FAN DUTY

Target duty ratio of voltage (applied voltage) applied to blower motor by A/C amp.

VEHICLE SPEED

[km/h

(mph)]

Vehicle speed signal value received from combination meter via CAN communication.

Monitor item [Unit]

Description

Test item

Description

HVAC TEST

The operation check of air conditioning system can be performed by selecting the mode. 
Refer to the following table for the conditions of each mode. 

Test item

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

MODE 7

Mode door motor position

VENT

VENT

B/L

B/L

FOOT

D/F

DEF

Intake door motor position

REC

REC

20% FRE

20% FRE

FRE

FRE

FRE

Air mix door motor position

FULL COLD

FULL COLD

FULL COLD

FULL HOT

FULL HOT

FULL HOT

FULL HOT

Blower motor (duty ratio)

35%

35%

60%

60%

90%

90%

35%

Work item

Description

Refer to

Door Motor Starting Position Reset

Starting position reset of air mix door motor and mode door 
motor can be performed. 

HAC-272, "Work Procedure"