Infiniti QX56 (Z62). Manual — part 801

B263D, B263E, B263F INTAKE DOOR MOTOR

HAC-95

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B263D, B263E, B263F INTAKE DOOR MOTOR

DTC Logic

INFOID:0000000006275929

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-III.

3.

Check DTC.

Is DTC detected?

YES

>> Refer to

HAC-95, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006275930

1.

CHECK INTAKE DOOR MOTOR COMMUNICATION SIGNAL

1.

Turn ignition switch ON.

2.

Check output waveform between intake door motor harness connector and ground with the oscilloscope.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK INSTALLATION OF INTAKE DOOR MOTOR CONTROL LINKAGE

Check intake door motor control linkage is properly installed. Refer to

HAC-152, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace intake door motor. Refer to

HAC-153, "INTAKE DOOR MOTOR : Removal and Installa-

tion"

.

NO

>> Repair or replace malfunctioning part.

DTC

Items

(CONSULT-III screen terms)

DTC detection condition

Possible cause

B263D

FRE DOOR FAIL

When the malfunctioning intake door
position is detected at FRE position

• Intake door motor

(PBR internal circuit is open or short-
ed)

• Intake door motor control linkage in-

stallation condition

• A/C auto amp.
• Harness and connector

(LIN communication line is open or
shorted)

B263E

20P FRE DOOR FAIL

When the malfunctioning intake door
position is detected at 20% FRE posi-
tion

B263F

REC DOOR FAIL

When the malfunctioning intake door
position is detected at REC position

+

−

Output waveform

Intake door motor

Connector

Terminal

M254

3

Ground

SJIA1453J

HAC-96

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B263D, B263E, B263F INTAKE DOOR MOTOR

3.

CHECK INTAKE DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

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

3.

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

Is the inspection result normal?

YES

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

HAC-146, "Removal and Installation"

.

NO

>> Repair harness or connector.

Intake door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M254

3

M50

16

Existed

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

HAC-97

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

DTC Logic

INFOID:0000000006275931

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “Self Diagnostic Result” mode of “HVAC” using CONSULT-III.

3.

Check DTC.

Is DTC detected?

YES

>> Refer to

HAC-97, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006275932

1.

CHECK UPPER VENTILATOR DOOR MOTOR COMMUNICATION SIGNAL

1.

Turn ignition switch ON.

2.

Check output waveform between upper vent door motor harness connector and ground with the oscillo-
scope.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

CHECK INSTALLATION OF UPPER VENTILATOR DOOR MOTOR

Check upper ventilator door motor is properly installed. Refer to

HAC-152, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace upper ventilator door motor. Refer to

HAC-154, "UPPER VENTILATOR DOOR MOTOR :

Removal and Installation"

.

DTC

Items

(CONSULT-III screen terms)

DTC detection condition

Possible cause

B2661

UPPER VENT DOOR MOT

When the malfunctioning upper ventila-
tor door position is detected at OPEN
position

• Upper ventilator door motor

(PBR internal circuit is open or short-
ed)

• Upper ventilator door motor installation

condition

• A/C auto amp.
• Harness and connector

(LIN communication line is open or
shorted)

B2662

When the malfunctioning upper ventila-
tor door position is detected at middle
position

B2663

When the malfunctioning upper ventila-
tor door position is detected at shut po-
sition

+

−

Output waveform

Upper vent door motor

Connector

Terminal

M256

3

Ground

SJIA1453J

HAC-98

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B2661, B2662, B2663 UPPER VENTILATOR DOOR MOTOR

NO

>> Repair or replace malfunctioning part.

3.

CHECK UPPER VENTILATOR DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect upper vent door motor and A/C auto amp. connector.

3.

Check continuity between upper vent door motor harness connector and A/C auto amp. harness connec-
tor.

Is the inspection result normal?

YES

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

HAC-146, "Removal and Installation"

.

NO

>> Repair harness or connector.

Upper vent door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

M256

3

M50

16

Existed