Nissan Maxima. Manual - part 745

HAC-156

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

B263D, B263E, B263F INTAKE DOOR MOTOR

Diagnosis Procedure

INFOID:0000000010051160

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK INTAKE DOOR MOTOR POWER SUPPLY

1. Turn ignition switch ON.

2. Check voltage between intake door motor harness connector

M126 terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair harness or connector.

2.

CHECK SIGNAL FOR INTAKE DOOR MOTOR

Confirm A/C LAN signal between intake door motor harness connec-

tor M126 terminal 3 and ground using an oscilloscope.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK INTAKE DOOR MOTOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect intake door motor connector.

3. Check continuity between intake door motor harness connector

M126 terminal 2 and ground.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to 

HAC-210, "INTAKE

DOOR MOTOR : Removal and Installation"

.

NO

>> Repair harness or connector.

1 - Ground

: Battery Voltage

AWIIA1151ZZ

(+)

(

−)

Voltage

Intake door motor

—

Connector

Terminal

M126

3

Ground

AWIIA1152ZZ

SJIA1453J

2 - Ground

: Continuity should exist.

AWIIA1153ZZ

BLOWER MOTOR

HAC-157

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

BLOWER MOTOR

Description

INFOID:0000000010051161

COMPONENT DESCRIPTION

Brush-less Motor

The blower motor utilizes a brush-less motor with a rotating magnet.

Quietness is improved over previous motors where the brush was

the point of contact and the coil rotated.

Blower Motor Circuit

Component Function Check

INFOID:0000000010051162

1.

CHECK OPERATION

1. Warm up the engine.

2. Operate the fan control dial. Check that the fan speed and indicator are switched for all fan speeds. 
Does it operate normally?

YES

>> Inspection End.

NO

>> Perform trouble diagnosis for the blower motor. Refer to 

HAC-157, "Diagnosis Procedure"

.  

Diagnosis Procedure

INFOID:0000000010051163

Regarding Wiring Diagram information, refer to 

HAC-173, "Wiring Diagram - With Monochrome Display"

.

1.

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT

1. Using CONSULT, perform “SELF-DIAGNOSIS RESULTS” of HVAC. 

2. Check if any DTC No. is displayed in the self-diagnosis results. 

NOTE:

If DTC is displayed along with DTC U1000 or U1010, first diagnose the DTC U1000 or U1010. Refer to 

HAC-

133, "DTC Logic"

 or 

HAC-134, "DTC Logic"

. 

Is any DTC No. displayed?

YES

>> Perform diagnosis for the applicable DTC. Refer to 

HAC-171, "DTC Index"

. 

NO

>> GO TO 2.

2.

CHECK WITH ACTIVE TEST OF CONSULT

ZHA152H

AWIIA1094GB

HAC-158

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

BLOWER MOTOR

1. Using CONSULT, perform “HVAC TEST”“ACTIVE TEST” of HVAC to check each output device. Refer to

HAC-129, "CONSULT Function"

. 

NOTE:

Perform the ACTIVE TEST after starting the engine, because the A/C compressor is operating. 

2. Check that the blower motor control signal changes according to each indicator signal. 

NOTE:
Perform the inspection of each output device after starting the engine because the A/C compressor is operating. 

Does it operate normally?

YES

>> Inspection End.

NO

>> GO TO 3.

3.

CHECK FUSE

Check 15A fuses (Nos. 21 and 22) located in fuse block (J/B). 

NOTE:

Refer to 

PG-62, "Terminal Arrangement"

 for fuse location. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 8. 

4.

CHECK POWER SUPPLY FOR BLOWER MOTOR

1. Turn ignition switch OFF.

2. Disconnect blower motor connector.

3. Turn ignition switch ON.

4. Check voltage between blower motor harness connector M31

terminal 4 and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 10.

5.

CHECK BLOWER MOTOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check continuity between blower motor harness connector M31

terminal 1 and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK BLOWER MOTOR CIRCUIT CONTINUITY

Test item

MODE 1

MODE 2

MODE 3

MODE 4

MODE 5

MODE 6

Mode door position

VENT1

B/L1

B/L2

FOOT

D/F

DEF

Intake door position

REC

REC

20%FRE

FRE

FRE

FRE

Air mix door position 
(driver & passenger 
side)

FULL COLD

FULL COLD

FULL HOT

FULL HOT

FULL HOT

FULL HOT

Blower motor duty ratio

37%

91%

65%

65%

65%

91%

A/C compressor (Mag-
net clutch)

ON

ON

OFF

OFF

ON

ON

4 - Ground

: Battery voltage

AWIIA1154ZZ

1 - Ground

: Continuity should exist.

AWIIA1155ZZ

BLOWER MOTOR

HAC-159

< DTC/CIRCUIT DIAGNOSIS >

[WITH MONOCHROME DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

1. Disconnect A/C auto amp. connector.

2. Check continuity between blower motor harness connector M31

(A) terminal 3 and A/C auto amp. harness connector M37 (B)

terminal 32.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector.

7.

CHECK A/C AUTO AMP. OUTPUT SIGNAL

1. Reconnect blower motor connector and A/C auto amp. connec-

tor.

2. Turn ignition switch ON.

3. Set MODE switch to the VENT position.

4. Check the output waveform between blower motor harness con-

nector M31 terminal 3 and ground using an oscilloscope, while

varying the fan speed from 1 to 7. 

Is the inspection result normal?

YES

>> Replace the blower motor. Refer to 

VTL-16, "BLOWER MOTOR : Removal and Installation"

.

NO

>> Replace the A/C auto amp. Refer to 

HAC-203, "Removal and Installation"

.

8.

REPLACE FUSES

1. Replace fuses.

2. Activate the blower motor.
Does the fuse blow?

YES

>> GO TO 9.

NO

>> Inspection End.

9.

CHECK BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT

3 - 32

: Continuity should exist.

AWIIA1156ZZ

AWIIA1157ZZ

AWIIA1098GB