Infiniti FX35, FX50 (S51). Manual - part 1623

SE-12

< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

Is the fuse fusing?

YES

>> Replace the blown fuse after repairing the affected circuit if a fuse is blown.

NO

>> GO TO 2.

2.

CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT POWER SUPPLY 

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat control unit (passenger side) connector.

3.

Turn ignition switch ON.

4.

Check voltage between climate controlled seat control unit (passenger side) harness connector and
ground.

Is the measurement value normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK GROUND CIRCUIT

Check continuity between harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

4.

CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT POWER SUPPLY CIRCUIT 1

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat relay.

3.

Check continuity between climate controlled seat control unit (passenger side) harness connector and cli-
mate controlled seat relay harness connector.

4.

Check continuity between climate controlled seat control unit (driver side) harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness or connector.

5.

CHECK CILMATE CONTROLLED SEAT RELAY POWER SUPPLY CIRCUIT 2

1.

Turn ignition switch ON.

2.

Check voltage between climate controlled seat relay harness connector and ground.

(+)

(

−

)

Voltage

(Approx.)

Climate controlled seat control unit (passenger side)

Connector

Terminal

B518

55

Ground

Battery voltage

B519

70

Climate controlled seat control unit (passenger side)

Ground

Continuity

Connector

Terminal

B519

56

Existed

Climate controlled seat control unit (passenger 

side)

Climate controlled seat relay

Continuity

Connector

Terminal

Connector

Terminal

B518

55

M64

3

Existed

B519

70

Climate controlled seat control unit (driver side)

Ground

Continuity

Connector

Terminal

B518

55

Not existed

B519

70

POWER SUPPLY AND GROUND CIRCUIT

SE-13

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

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A

B

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N

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P

Is the measurement value normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness or connector.

6.

CHECK CLIMATE CONTROLLED SEAT RELAY

Check climate controlled seat relay.
Refer to 

SE-13, "CLIMATE CONTROLLED SEAT CONTROL UNIT : Component Inspection"

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace climate controlled seat relay.

7.

CHECK CLIMATE CONTROLLED SEAT RELAY GROUND CIRCUIT

Check continuity between climate controlled seat relay harness connector and ground.

Does continuity exist?

YES

>> GO TO 8.

NO

>> Repair or replace harness.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

CLIMATE CONTROLLED SEAT CONTROL UNIT : Component Inspection

INFOID:0000000005236610

1.

CHECK CLIMATE CONTROLLED SEAT  RELAY

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat relay.

3.

Check climate controlled seat relay.

Is the inspection result normal?

YES

>> INSPECTION END.

NO

>> Replace climate controlled seat relay.

Terminals

Voltage

(Approx.)

(+)

(

−

)

Climate controlled seat relay

Ground

Connector

Terminal

M64

2

Battery voltage

5

Climate controlled seat relay

Ground

Continuity

Connector

Terminal

M64

1

Existed

Climate con-

trolled seat relay

Condition

Continuity

Terminal

3

5

12 V direct current supply between ter-
minals 1 and 2.

Existed

No current supply

Not existed

6

7

12 V direct current supply between ter-
minals 1 and 2.

Existed

No current supply

Not existed

JMJIA2104ZZ

SE-14

< DTC/CIRCUIT DIAGNOSIS >

CLIMATE CONTROLLED SEAT SWITCH

CLIMATE CONTROLLED SEAT SWITCH

Description

INFOID:0000000005236611

Installed in the center console and transmits signals to climate controlled seat control unit in accordance with
the HEAT or COOL switch operation and the temperature switch operation.

Component Function Check

INFOID:0000000005236612

1.

CHECK FUNCTION

Check that climate controlled seat activates when operating climate controlled seat control switch.
Is the inspection result normal?

YES

>> Climate controlled seat switch is OK.

NO

>> Refer to 

SE-14, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005236613

1.

CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT INPUT SIGNAL

1.

Turn ignition switch ON.

2.

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

Is the inspection result normal?

YES

>> Climate controlled seat switch circuit is OK.

NO-1

>> HEAT or COOL mode is NG :GO TO 2.

NO-2

>> HEAT and COOL modes are NG : GO TO 3.

2.

CHECK CLIMATE CONTROLLED SEAT SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat switch connector and climate controlled seat control unit connector.

3.

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

(+)

(–)

Condition

Voltage (V)

(Approx.)

Climate controlled seat control unit

Connector

Terminal

Driver side

B508

6

Ground

Climate controlled seat 
switch 

LO COOL

0.8 - 1.5

MID COOL

1.6 - 2.5

HI  COOL

2.6 - 4.2

OFF

0

16

Climate controlled seat 
switch 

LO HEAT

0.8 - 1.5

MID HEAT

1.6 - 2.5

HI HEAT

2.6 - 4.2

OFF

0

Passenger side

B518

6

Climate controlled seat 
switch 

LO COOL

0.8 - 1.5

MID COOL

1.6 - 2.5

HI  COOL

2.6 - 4.2

OFF

0

16

Climate controlled seat 
switch 

LO HEAT

0.8 - 1.5

MID HEAT

1.6 - 2.5

HI HEAT

2.6 - 4.2

OFF

0

CLIMATE CONTROLLED SEAT SWITCH

SE-15

< DTC/CIRCUIT DIAGNOSIS >

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SE

N

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P

4.

Check continuity between climate controlled seat switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace harness.

3.

CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat switch connector.

3.

Turn ignition switch ON.

4.

Check voltage between climate controlled seat switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK CLIMATE CONTROLLED SEAT SWITCH POWER SUPPLY CIRCUIT 

1.

Turn ignition switch OFF.

2.

Disconnect climate controlled seat control unit connector.

3.

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

4.

Check continuity between climate controlled seat switch harness connector and ground.

Is the inspection result normal?

Climate controlled seat switch

Climate cotrolled seat control unit

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

COOL

M177

2

B508

6

Existed

HEAT

3

16

Passenger side

COOL

M178

2

B518

6

HEAT

3

16

Climate controlled seat switch

Ground

Continuity 

Connector

Terminal

Driver side

COOL

M177

2

Not existed

HEAT

3

Passenger side

COOL

M178

2

HEAT

3

(+)

(–)

Voltage (V)

(Approx.)

Climate controlled seat switch

Connector

Terminal

Driver side

M177

1

Ground

Battery voltage

Passenger side

M178

1

Climate controlled seat switch

Climate cotrolled seat control unit

Continuity 

Connector

Terminal

Connector

Terminal

Driver side

M177

1

B508

21

Existed

Passenger side

M178

1

B518

21

Climate controlled seat switch

Ground

Continuity 

Connector

Terminal

Driver side

M177

1

Not existed

Passenger side

M178

1