Infiniti QX56 (Z62). Manual - part 804

B266B, B266C REAR IN-VEHICLE SENSOR

HAC-107

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK REAR IN-VEHICLE SENSOR 

Check rear in-vehicle sensor. Refer to 

HAC-107, "Component Inspection"

.

Is the inspection result normal?

YES

>> Replace A/C auto amp.. Refer to 

HAC-146, "Removal and Installation"

.

NO

>> Replace rear in-vehicle sensor. Refer to 

HAC-148, "REAR A/C UNIT ASSEMBLY : Removal and

Installation"

.

4.

CHECK REAR IN-VEHCLE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector.

3.

Check continuity between rear in-vehicle sensor harness connector and A/C auto amp. harness connec-
tor.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair harness or connector.

5.

CHECK REAR IN-VEHCLE SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

Check continuity between rear in-vehicle sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair harness or connector.

6.

CHECK REAR IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT FOR POWER SHORT

1.

Turn ignition switch ON.

2.

Check voltage between rear in-vehicle sensor 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.

Component Inspection

INFOID:0000000006275942

1.

CHECK REAR IN-VEHICLE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect rear in-vehicle sensor connector.

3.

Check resistance between rear in-vehicle sensor terminals.

Rear in-vehicle sensor

A/C auto amp.

Continuity

Connector

Terminal

Connector

Terminal

B211

1

M50

8

Existed

Rear in-vehicle sensor

—

Continuity

Connector

Terminal

B211

1

Ground

Not existed

+

−

Voltage

(Approx.)

Rear in-vehicle sensor

Connector

Terminal

B211

1

Ground

0 V

HAC-108

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

B266B, B266C REAR IN-VEHICLE SENSOR

Is the inspection result normal?

YES

>> INSPECTION END 

NO

>> Replace rear in-vehicle sensor. Refer to 

HAC-148, "REAR A/C UNIT ASSEMBLY : Removal and

Installation"

.

Terminal

Condition

Resistance: k

Ω

Temperature: 

°

C (

°

F)

1

2

−

15 (5)

12.34

−

10 (14)

9.62

−

5 (23)

7.56

0 (32)

6.00

5 (41)

4.80

10 (50)

3.87

15 (59)

3.14

20 (68)

2.57

25 (77)

2.12

30 (86)

1.76

35 (95)

1.47

40 (104)

1.23

45 (113)

1.04

B27B0 A/C AUTO AMP.

HAC-109

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

B27B0 A/C AUTO AMP.

DTC Logic

INFOID:0000000006275946

DTC DETECTION LOGIC 

NOTE:
• If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

HAC-

72, "DTC Logic"

.

• If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. 

HAC-73,

"DTC 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-109, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006275947

1.

PERFORM SELF DIAGNOSTIC

With CONSULT-III

1.

Turn ignition switch ON.

2.

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

3.

Touch “ERASE”.

4.

Turn ignition switch OFF.

5.

Turn ignition switch ON.

6.

Perform “DTC CONFIRMATION PROCEDURE”. Refer to 

HAC-109, "DTC Logic"

.

Is DTC detected again?

YES

>> Replace A/C auto amp. Refer to 

HAC-146, "Removal and Installation"

.

NO

>> INSPECTION END

DTC

Items

(CONSULT-III screen terms)

DTC detection condition

Possible cause

B27B0

A/C AUTO AMP.

A/C auto amp. EEPROM system is mal-
functioning.

A/C auto amp.

HAC-110

< DTC/CIRCUIT DIAGNOSIS >

[AUTOMATIC AIR CONDITIONING]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

A/C AUTO AMP.

A/C AUTO AMP. : Diagnosis Procedure

INFOID:0000000006275948

1.

CHECK FUSE

Check 10A fuse [No. 9, 19, and 4, located in the 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 A/C AUTO AMP. POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect A/C auto amp. connector. 

3.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector between A/C auto amp. and fuse block (J/B).

3.

CHECK A/C AUTO AMP. GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

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

Is the inspection result normal?

YES

>> INSPECTION END 

NO

>> Repair harness or connector.

FRONT AIR MIX DOOR MOTOR (DRIVER SIDE)

FRONT AIR MIX DOOR MOTOR (DRIVER SIDE) : Diagnosis Procedure

INFOID:0000000006275949

1.

CHECK FRONT AIR MIX DOOR MOTOR (DRIVER SIDE) POWER SUPPLY

1.

Turn ignition switch ON.

2.

Check voltage between front air mix door motor LH harness connector and ground. 

+

−

Voltage

A/C auto amp.

Ignition switch position

Connector

Terminal

OFF

ACC

ON

M50

4

Ground

Approx. 0 V

Battery voltage

Battery voltage

23

Approx. 0 V

Approx. 0 V

Battery voltage

3

Battery voltage

Battery voltage

Battery voltage

A/C auto amp.

—

Continuity

Connector

Terminal

M50

2

Ground

Existed

22

37