Infiniti FX35, FX50 (S51). Manual - part 1624

SE-16

< DTC/CIRCUIT DIAGNOSIS >

CLIMATE CONTROLLED SEAT SWITCH

YES

>> Replace climate controlled seat control unit. Refer to 

SE-85, "Disassembly and Assembly"

.

NO

>> Repair or replace harness.

5.

CHECK CLIMATE CONTROLLED SEAT SWITCH

Check climate controlled seat switch. 
Refer to

SE-16, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace Climate controlled seat switch. Refer to 

SE-106, "Removal and Installation"

.

6.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005236614

1.

CHECK CLIMATE CONTROLLED SEAT SWITCH

1.

Turn ignition OFF.

2.

Disconnect climate controlled seat switch connector.

3.

Check climate controlled seat switch terminals.

Is the inspection result normal?

YES

>> Climate controlled seat switch is OK.

NO

>> Replace climate controlled  seat switch. Refer to 

SE-106, "Removal and Installation"

.

Climate controlled seat switch 

Terminal

Condition

Continuity

Driver side

M177

2

1

Climate controlled seat 
switch

COOL mode

Pressed

Existed

Released

Not existed

3

HEAT  mode

Pressed

Existed

Released

Not existed

Passenger side

M178

2

1

Climate controlled seat 
switch

COOL mode

Pressed

Existed

Released

Not existed

3

HEAT  mode

Pressed

Existed

Released

Not existed

SEATBACK THERMAL ELECTRIC DEVICE

SE-17

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

SEATBACK THERMAL ELECTRIC DEVICE

Description

INFOID:0000000005236615

Installed in the seatback backside and heats or cools the airflow from the climate controlled seat blower motor
in accordance with the control from the climate controlled seat control unit.

Component Function Check

INFOID:0000000005236616

1.

CHECK FUNCTION

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

Is the inspection result normal?

YES

>> Seatack thermal device function is OK.

NO

>> Refer to 

SE-17, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005236617

1.

CHECK SEATBACK THERMAL ELECTRIC DEVICE SIGNAL

1.

Turn ignition switch ON.

2.

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

*:It changes between battery voitage or 0V

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 device.

NO

>> GO TO 2.

2.

CHECK SEATBACK THERMAL ELECTRIC DEVICE CIRCUIT

1.

Turn ignition switch OFF.

2.

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

3.

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

4.

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

(+)

(–)

Condition

Voltage (V)

(Approx.)

Seatback thermal electric device

Connector

Terminal

Driver side

B504

35

Ground

Climate con-
trolled seat 
switch

HEAT and COOL

0 - battery voltage*

Other than above

0

36

HEAT and COOL

0 - battery voltage*

Other than above

0

Passenger side

B514

35

Climate con-
trolled seat 
switch

HEAT and COOL

0 - battery voltage*

Other than above

0

36

HEAT and COOL

0 - battery voltage*

Other than above

0

Climate controlled seat control unit

Seatback thermal electric device

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

B509

35

B504

35

Existed

36

36

Passenger side

B519

35

B514

35

36

36

SE-18

< DTC/CIRCUIT DIAGNOSIS >

SEATBACK THERMAL ELECTRIC DEVICE

Is the inspection result normal?

YES

>> Replace climate controlled seat control unit. Refer to 

SE-85, "Disassembly and Assembly"

.

NO

>> Repair or replace harness.

Climate controlled seat control unit

Ground

Continuity 

Connector

Terminal

Driver side

B509

35

Not existed

36

Passenger side

B519

35

36

SEATBACK THERMAL ELECTRIC DEVICE SENSOR

SE-19

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

SEATBACK THERMAL ELECTRIC DEVICE SENSOR

Description

INFOID:0000000005236618

Measures seatback temperature.

Diagnosis Procedure

INFOID:0000000005236619

1.

CHECK SEATBACK THERMAL ELECTRIC DEVICE SENSOR CIRCUIT

1.

Turn ignition switch ON.

2.

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

Is the inspection result normal?

YES

>> Seatback thermal electric device sensor circuit is OK.

NO

>> GO TO 2.

2.

CHECK SEATBACK THERMAL ELECTRIC DEVICE SENSOR HARNESS

1.

Turn ignition switch OFF.

2.

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

3.

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

4.

Check continuity between font ventilation seat control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK SEATBACK THERMAL ELECTRIC DEVICE SENSOR

Check resistance between seatback thermal electric device connector.

(+)

(–)

Condition

Voltage (V)

(Approx.)

Climate controlled seat control unit

Connector

Terminal

Driver side

B507

37

Ground

Climate controlled seat 
operated

1 - 5

Passenger side

B517

Climate controlled seat control unit

Seatback thermal electric device

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

B507

37

B504

37

Existed

38

38

Passenger side

B517

37

B514

37

38

38

Climate controlled seat control unit

Ground

Continuity 

Connector

Terminal

Driver side

B507

37

Not existed

38

Passenger side

B517

37

38

Seatback thermal electric device

Terminal

Resistance

(K

Ω

)

(Approx.)

Connector

Driver side

B504

37

38

1

Passenger side

B514