Infiniti F50. Manual - part 787

HEATED SEAT

SE-139

C

D

E

F

G

H

J

K

L

M

A

B

SE

Terminals and Reference Values for Rear Power Seat Control Unit LH and RH

EIS00153

Work Flow

EIS003VU

1.

Check the symptom and customer's requests.

2.

Understand the outline of system. Refer to 

SE-128, "System Description"

 .

3.

According to the trouble diagnosis chart, repair or replace the cause of the malfunction. Refer to 

SE-140,

"Trouble Diagnoses Symptom Chart"

 .

4.

Does heated seat operate normally? YES: GO TO 5, NO: GO TO 3.

5.

INSPECTION END.

TER-

MINAL

WIRE 

COLOR

ITEM

Ignition 

switch

CONDITION

Voltage (V)

(Approx.)

2

G

BAT power supply

ON

—

Battery voltage

5

BR

Heater Hi signal

Heater Hi operation

Battery voltage

Other than above

0

8

OR

Heater Lo signal

Heater Lo operation

Battery voltage

—

0

Other than above

0

15

B

Ground

—

0

20

W/B

Heater indicator Hi signal

Heater Hi operation (lit)

1

Other than above

Battery voltage

22

L/W

Heater switch–Hi signal

Heater switch (Hi) –ON (pressed)

0

Heater switch (Hi)–OFF

5

26

Y/B

Heater indicator Lo signal

Heater Lo operation (lit)

1

Other than above

Battery voltage

32

LG/W

Heater switch–Lo signal

Heater switch (Lo)–ON (pressed)

0

Heater switch (Lo)–OFF

Battery voltage

44

GY/B

IGN power supply

—

Battery voltage

SE-140

HEATED SEAT

Trouble Diagnoses Symptom Chart

EIS003VV

●

Check that other systems using the signal of the following systems operate normally.

Symptom

Diagnoses / service procedure

Refer to page

Front heated seat driver side, passenger side and rear heated 
seat LH, RH do not operate.

Heated seat power supply circuit inspection.

SE-141

Front heated seat driver side and passenger side do not oper-
ate but the rear heated seat is operated.

Heated seat power supply circuit inspection.

SE-141

Front heated seat driver side or passenger side does not oper-
ate.

Front heated seat switch inspection.

SE-141

Front heated seat driver side or passenger side do not operate 
with LOW position and, seat cushion is not heated with HIGH 
position.

Front heated seat circuit inspection 1.

SE-142

Front heated seat driver side or passenger side do not operate 
with LOW position but seat cushion are heated with HIGH posi-
tion.

Front heated seat circuit inspection 2.

SE-144

Front heated seat driver side or passenger side do not operate 
with HIGH position, seat cushion and seat back is heated with 
LOW position.

Front heated seat circuit inspection 3.

SE-146

Front heated seat with HIGH position is not warmer than LOW 
position.

Front heated seat switch ground circuit inspec-
tion.

SE-147

Rear heater seat LH and RH do not operated.

Rear heated seat power supply circuit inspec-
tion 1.

SE-148

Rear heater seat LH or RH do not operate.

1. Rear heated seat power supply and ground 
circuit inspection.

SE-149

2. Rear power seat switch (Heater switch) 
ground circuit inspection.

SE-150

3.Replace rear power seat control unit.

–

Rear heated seat driver side or passenger side do not operate 
with LOW position and, seat cushion is do not heated with 
HIGH position.

Rear heated seat circuit inspection 1.

SE-151

Rear heated seat driver side or passenger side do not operate 
with LOW position but seat cushion is heated with HIGH posi-
tion.

Rear heated seat circuit inspection 2.

SE-152

Rear heated seat driver side or passenger side do not operate 
with HIGH position, seat cushion and seat back are heated with 
LOW position.

Rear heated seat circuit inspection 3.

SE-153

Rear heated seat driver side or passenger side switch LOW 
position do not operate and, when heated seat switch HIGH 
position, seat back and seat cushion is heated.

1. Rear heater seat switch LOW inspection.

SE-155

2. Rear heats witch seat HIGH inspection.

SE-156

Rear heated seat with HIGH position is not warmer than LOW 
position.

Rear heated seat ground circuit inspection.

SE-157

HEATED SEAT

SE-141

C

D

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F

G

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A

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SE

Heated Seat Power Supply Circuit Inspection

EIS003VW

1. 

CHECK FUSIBLE LINK 

Check 20A fuse [No.81, located in fuse block].
NOTE:
Refer to

SE-130, "Component Parts and Harness Connector Location"

 .

OK or NG

OK

>> GO TO 2.

NG

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to 

SE-

130, "Component Parts and Harness Connector Location"

 .

2. 

CHECK HEATED SEAT POWER SUPPLY CIRCUIT

1.

Disconnect front heated seat switch connector.

2.

Turn ignition switch ON.

3.

Check voltage between front heated seat driver side switch con-
nector M94 terminal 1 (W/B) and ground.

OK or NG

OK

>> Check the condition of the harness and connector.

NG

>> Repair or replace harness between fuse block and

front heated seat driver side switch.

Front Heated Seat Switch Inspection 

EIS003VX

1. 

CHECK FRONT HEATED SEAT POWER SUPPLY CIRCUIT

1.

Disconnect front heated seat switch connector.

2.

Turn ignition switch ON.

3.

Check voltage between front heated seat switch connector M94
(driver side), M95 (passenger side) terminal 1 (W/B) and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness between fuse block and

front heated seat switch.

2. 

CHECK FRONT HEATED SEAT SWITCH

1.

Turn ignition switch OFF.

2.

Check continuity between front heated seat switch as follows.

OK or NG

OK

>> Check the condition of the harness and connector.

NG

>> Replace front heated seat switch.

1 (W/B) 

−

 Ground

: Battery voltage

PIIA4103E

1 (W/B) 

−

 Ground

: Battery voltage

PIIA4103E

Terminal

Condition

Continuity

1

2

Front heated seat switch LOW.

YES

3

Front heated seat switch HIGH.

YES

2, 3

Other than above.

NO

PIIA4104E

SE-142

HEATED SEAT

Front Heated Seat  Circuit Inspection 1

EIS003VY

1. 

CHECK FRONT HEATED SEAT SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect front heated seat switch connector.

3.

Check continuity between front heated side power seat switch.

OK or NG

OK

>> GO TO 2.

NG

>> Replace front heated seat switch.

2. 

CHECK FRONT SEAT BACK HEATER CIRCUIT

1.

Connect front heated seat switch connector.

2.

Turn ignition switch ON.

3.

Check voltage between front seat back heater connector and
ground.

OK or NG

OK

>> GO TO 6.

NG

>> When turn ignition switch ON and heated switch ON (LOW, HIGH), check the following.

●

When voltage is approx. 0V   GO TO 3.

●

When voltage is approx. 12V GO TO 4.

3. 

CHECK FRONT SEAT CUSHION HEATER HARNESS

1.

Turn ignition switch OFF.

2.

Disconnect front seat back heater connector and front seat
cushion heater connector.

3.

Check continuity between front seat back heater connector
B152 (Driver side), B352 (Passenger side) terminal C (SB) and
ground.

OK or NG

OK

>> Replace rear seat back.

NG

>> Repair or replace harness between front seat back and

font seat cushion.

Terminal

Condition

Continuity

3 (R/Y)

4 (B)

Front heated seat switch LOW.

YES

Other than above.

NO

PIIA4105E

Connector

Terminal

(Wire color)

Condition

Voltage (V) 

(Approx)

(+)

(–)

B152

 (Driver side),

B352

(Passenger 

side)

C (SB)

Ground

Turn ignition switch ON.
Front heated seat switch 
LOW.

 6.5

Turn ignition switch ON.
Front heated seat switch 
HIGH.

6.5

Front heated seat switch 
OFF.

0

PIIA4106E

C (SB) 

−

 Ground

:Continuity should exist

PIIA4019E