Infiniti QX56 (Z62). Manual - part 1134

SE-74

< DTC/CIRCUIT DIAGNOSIS >

CLIMATE CONTROLLED SEAT SWITCH

YES

>> Replace climate controlled seat control unit. Refer to 

SE-117, "CLIMATE CONTROLLED SEAT

UNIT : Disassembly and Assembly"

.

NO

>> Repair or replace harness.

5.

CHECK CLIMATE CONTROLLED SEAT SWITCH

Check climate controlled seat switch. 
Refer to 

SE-74, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace climate controlled seat switch. Refer to 

SE-147, "Removal and Installation"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006217393

1.

CHECK CLIMATE CONTROLLED SEAT SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat switch connector.

3.

Check the continuity between climate controlled seat switch terminals under the following terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace climate controlled seat switch. Refer to 

SE-147, "Removal and Installation"

.

Terminal

Condition

Continuity

2

1

Climate controlled seat switch

COOL mode

ON

Existed

OFF

Not existed

3

HEAT  mode

ON

Existed

OFF

Not existed

SEATBACK THERMAL ELECTRIC UNIT

SE-75

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

SEATBACK THERMAL ELECTRIC UNIT

Component Function Check

INFOID:0000000006217394

1.

CHECK SEATBACK THERMAL ELECTRIC UNIT FUNCTION

Check whether or not the temperature of the seatback thermal electric unit changes in accordance with the
HEAT or COOL switch operation of the climate controlled seat control switch.

Is the inspection result normal?

YES

>> Seatback thermal electric unit function is OK.

NO

>> Refer to 

SE-75, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006217395

1.

CHECK SEATBACK THERMAL ELECTRIC UNIT INPUT SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between seatback thermal electric unit harness connector and ground.

*:It changes between 12 and 0 V

NOTE:
Wait 1 minute or more after the activation start, and then start the measurement.

Is the inspection result normal?

YES

>> Replace seatback thermal electric unit.

NO

>> GO TO 2.

2.

CHECK SEATBACK THERMAL ELECTRIC UNIT CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat control unit connector and seatback thermal electric unit connector.

3.

Check continuity between climate controlled seat control unit harness connector and seatback thermal
electric unit harness connector. 

4.

Check continuity between climate controlled seat control unit harness connector and ground.

(+)

(–)

Condition

Voltage (V)

(Approx.)

Seatback thermal electric unit

Connector

Terminal

Driver side

B465

58

Ground

Climate controlled seat 
switch

HEAT or COOL

0 - 12*

Other than above

0

59

HEAT or COOL

0 - 12*

Other than above

0

Passenger side

B439

58

Climate controlled seat 
switch

HEAT or COOL

0 - 12*

Other than above

0

59

HEAT or COOL

0 - 12*

Other than above

0

Climate controlled seat control unit

Seatback thermal electric unit

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

B509

58

B465

58

Existed

59

59

Passenger side

B519

58

B439

58

59

59

SE-76

< DTC/CIRCUIT DIAGNOSIS >

SEATBACK THERMAL ELECTRIC UNIT

Is the inspection result normal?

YES

>> Replace climate controlled seat control unit. Refer to 

SE-117, "CLIMATE CONTROLLED SEAT

UNIT : Disassembly and Assembly"

.

NO

>> Repair or replace harness.

Climate controlled seat control unit

Ground

Continuity 

Connector

Terminal

Driver side

B509

58

Not existed

59

Passenger side

B519

58

59

SEATBACK THERMAL ELECTRIC UNIT SENSOR

SE-77

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

SEATBACK THERMAL ELECTRIC UNIT SENSOR

Component Function Check

INFOID:0000000006217396

1.

CHECK SEATBACK THERMAL ELECTRIC UNIT SENSOR FUNCTION

Check whether or not the temperature of the seatback thermal electric unit changes in accordance with the
HEAT or COOL switch operation of the climate controlled seat control switch.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Refer to 

SE-77, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006217397

1.

CHECK SEATBACK THERMAL ELECTRIC UNIT SENSOR SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between seatback thermal electric unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK SEATBACK THERMAL ELECTRIC UNIT SENSOR CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat control unit connector and seatback thermal electric unit connector.

3.

Check continuity between climate controlled seat control unit harness connector and seatback thermal
electric unit harness connector. 

4.

Check continuity between climate controlled seat control unit harness connector and ground.

Is the inspection result normal?

YES

>> Replace climate controlled seat control unit.

NO

>> Repair or replace harness.

3.

CHECK SEATBACK THERMAL ELECTRIC UNIT SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat control unit connector and seatback thermal electric unit connector.

3.

Check continuity between climate controlled seat control unit harness connector and seatback thermal
electric unit harness connector. 

(+)

(-)

Condition

Voltage (V)

(Approx.)

Seatback thermal electric unit

Connector

Terminal

Driver side

B465

61

Ground

Climate controlled seat 
operated

1 - 5

Passenger side

B439

Climate controlled seat control unit

Seatback thermal electric unit

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

B507

61

B465

61

Existed

Passenger side

B517

B439

Climate controlled seat control unit

Ground

Continuity 

Connector

Terminal

Driver side

B507

61

Not existed

Passenger side

B517