Infiniti QX56 (Z62). Manual - part 802

B2664, B2665 REAR AIR MIX DOOR MOTOR

HAC-99

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

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HAC

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B2664, B2665 REAR AIR MIX DOOR MOTOR

DTC Logic

INFOID:0000000006275933

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-99, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006275934

1.

CHECK REAR AIR MIX DOOR MOTOR COMMUNICATION SIGNAL

1.

Turn ignition switch ON.

2.

Check output waveform between rear air mix 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 REAR AIR MIX DOOR MOTOR

Check rear air mix door motor is properly installed. Refer to 

HAC-152, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace rear air mix door motor. Refer to 

HAC-154, "REAR AIR MIX DOOR MOTOR : Removal

and Installation"

.

NO

>> Repair or replace malfunctioning part.

DTC

Items

(CONSULT-III screen terms)

DTC detection condition

Possible cause

B2664

REAR AIR MIX DOOR MOT

Rear air mix door motor PBR position 
95% or more

• Rear air mix door motor

(PBR internal circuit is open or short-
ed)

• Rear air mix door motor installation 

condition

• A/C auto amp.
• Harness and connector

(LIN communication line is open or 
shorted)

B2665

Rear air mix door motor PBR position 
5% or less

+

−

Output waveform

Rear air mix door motor

Connector

Terminal

B210

3

Ground

SJIA1453J

HAC-100

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B2664, B2665 REAR AIR MIX DOOR MOTOR

3.

CHECK REAR AIR MIX DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear air mix door motor and A/C auto amp. connector. 

3.

Check continuity between rear air mix 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.

Rear air mix door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

B210

3

M50

16

Existed

B2666, B2669, B266A REAR MODE DOOR MOTOR

HAC-101

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B2666, B2669, B266A REAR MODE DOOR MOTOR

DTC Logic

INFOID:0000000006275935

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-101, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006275936

1.

CHECK REAR MODE DOOR MOTOR COMMUNICATION SIGNAL

1.

Turn ignition switch ON.

2.

Check output waveform between rear mode 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 REAR MODE DOOR MOTOR CONTROL LINKAGE

Check rear mode door motor control linkage is properly installed. Refer to 

HAC-152, "Exploded View"

.

Is the inspection result normal?

YES

>> Replace rear mode door motor. Refer to 

HAC-154, "REAR MODE DOOR MOTOR : Removal and

Installation"

.

NO

>> Repair or replace malfunctioning part.

DTC

Items

(CONSULT-III screen terms)

DTC detection condition

Possible cause

B2666

REAR MODE DOOR MOT

When the malfunctioning door position 
is detected at VENT position

• Rear mode door motor

(PBR internal circuit is open or short-
ed)

• Rear mode door motor control linkage 

installation condition

• A/C auto amp.
• Harness and connector

(LIN communication line is open or 
shorted)

B2669

When the malfunctioning door position 
is detected at B/L position

B266A

When the malfunctioning door position 
is detected at FOOT position

+

−

Output waveform

Rear mode door motor

Connector

Terminal

B209

3

Ground

SJIA1453J

HAC-102

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B2666, B2669, B266A REAR MODE DOOR MOTOR

3.

CHECK REAR MODE DOOR MOTOR COMMUNICATION SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect rear mode door motor and A/C auto amp. connector. 

3.

Check continuity between rear mode 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.

Rear mode door motor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

B209

3

M50

16

Existed