Infiniti QX56 (Z62). Manual - part 807

 

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Infiniti QX56 (Z62). Manual - part 807

 

 

DOOR MOTOR

HAC-119

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

YES

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

.

NO

>> Repair harness or connector.

HAC-120

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

DOOR MOTOR COMMUNICATION CIRCUIT

DOOR MOTOR COMMUNICATION CIRCUIT

Diagnosis Procedure

INFOID:0000000006275967

NOTE:
If all of door motor DTCs are detected, check this circuit.

1.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL

1.

Turn ignition switch ON.

2.

Check output waveform between A/C auto amp. harness connector and ground with the oscilloscope. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector and intake door motor connector.

3.

Check continuity between A/C auto amp. harness connector and intake door motor harness connector. 

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

3.

CHECK EACH DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT FOR SHORT

1.

Disconnect following connectors.

-

Front air mix door motor LH

-

Front air mix door motor RH

-

Front mode door motor

-

Upper vent door motor

-

Rear air mix door motor

-

Rear mode door motor

2.

Check continuity between A/C auto amp. harness connector and ground. 

Is the inspection result normal?

YES

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

.

NO

>> Repair harness or connector.

+

Output waveform

A/C auto amp.

Connector

Terminal

M50

16

Ground

SJIA1453J

A/C auto amp.

Intake door motor 

Continuity

Connector

Terminal

Connector

Terminal

M50

16

M254

3

Existed

A/C auto amp.

Continuity

Connector

Terminal

M50

16

Ground

Not existed

FRONT BLOWER MOTOR

HAC-121

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

FRONT BLOWER MOTOR

Diagnosis Procedure

INFOID:0000000006275968

1.

CHECK FUSE

1.

Turn ignition switch OFF.

2.

Check 15A fuse [No. 21 and 22, located in fuse block (J/B)]. 
NOTE:
Refer to 

PG-140, "Fuse, Connector and Terminal Arrangement"

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown. 

2.

CHECK FRONT BLOWER MOTOR POWER SUPPLY

1.

Disconnect front blower motor connector.

2.

Turn ignition switch ON.

3.

Check voltage between front blower motor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 6.

3.

CHECK FRONT BLOWER MOTOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between front blower motor harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair harness or connector. 

4.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL CIRCUIT

1.

Disconnect A/C auto amp. connector. 

2.

Check continuity between front blower motor harness connector and A/C auto amp. harness connector. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair the harness or connector.

5.

CHECK FRONT BLOWER MOTOR CONTROL SIGNAL

1.

Reconnect front blower motor connector and A/C auto amp. connector. 

2.

Turn ignition switch ON.

3.

Operate MODE switch to set air outlet to VENT. 

4.

Change fan speed from Lo to Hi, and check duty ratios between front blower motor harness connector
and ground by using an oscilloscope. 

+

Voltage

Front blower motor

Connector

Terminal

M272

1

Ground

Battery voltage

Front blower motor

Continuity

Connector

Terminal

M272

3

Ground

Existed

Front blower motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M272

2

M50

14

Existed

HAC-122

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

FRONT BLOWER MOTOR

NOTE:
Calculate drive signal duty ratio as shown in the figure.
T2 = Approx. 1.6 ms

Is the inspection result normal?

YES

>> Replace front blower motor. Refer to 

VTL-16, "FRONT A/C UNIT : Removal and Installation"

.

NO

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

.

6.

CHECK BLOWER RELAY GROUND CIRCUIT

Check continuity between fuse block (J/B) harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair harness or connector. 

7.

CHECK BLOWER RELAY

Check blower relay. Refer to 

HAC-123, "Component Inspection (Blower Relay)"

.

Is the inspection result normal?

YES

>> Repair harness or connector between front blower motor and fuse block (J/B).

NO

>> Replace blower relay.

Component Inspection (Front Blower Motor)

INFOID:0000000006275969

1.

CHECK FRONT BLOWER MOTOR-I

1.

Remove front blower motor.

2.

Check that there is not any mixing foreign object in the front blower motor. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace front blower motor. Refer to 

VTL-16, "FRONT A/C UNIT : Removal and Installation"

.

2.

CHECK FRONT BLOWER MOTOR-II

Check that there is not breakage or damage in the front blower motor. 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace front blower motor. Refer to 

VTL-16, "FRONT A/C UNIT : Removal and Installation"

.

3.

CHECK FRONT BLOWER MOTOR-III

Check that front blower motor turns smoothly. 

Is the inspection result normal?

YES

>> INSPECTION END

Front blower motor

Condition

Duty ratio

(Approx.)

Connector

Terminal

Fan speed (manual)

VENT mode

M272

2

1st

25 %

2nd

33 %

3rd

41 %

4th

51 %

5th

61 %

6th

69 %

7th

81 %

JPLIA1210GB

Fuse block (J/B)

Continuity

Connector

Terminal

M3

7C

Ground

Existed

 

 

 

 

 

 

 

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