Infiniti FX35, FX50 (S51). Manual - part 1636

SE-64

< ECU DIAGNOSIS INFORMATION >

CLIMATE CONTROLLED SEAT CONTROL UNIT

*: System voltage is the voltage between ventilation seat control unit power source and the ground.

NOTE:

Malfunction

Malfunctioning condition

The temperature difference between the seatback ther-
mal electric device and seat cushion thermal electric de-
vice is 30

°

C or more

• When it detects for 4 seconds that the temperature difference between 

the seatback thermal electric device and seat cushion thermal electric 
device is 30

°

C or more, stops the output to the thermal electric device, 

activates the climate controlled seat blower motor in the maximum posi-
tion, and sends the external airflow for 30 seconds

• If the temperature difference is still 30

°

C or more after 30 seconds pass, 

it stops all output and enters the system OFF condition

• When the temperature difference between seatback thermal electric de-

vice and seat cushion thermal electric device becomes 20

°

C or less, the 

system recovers automatically

• If it detects that the temperature difference is 30

°

C or more after the au-

tomatic system recovery, it immediately stops all output and enters the 
system OFF condition
NOTE:
When the switch operation is performed before entering the system OFF 
condition, the fail-safe mode is reset.

The temperature of thermal electric device is 110

°

C or 

more in the HEAT mode (any thermal electric device in the 
seatback or seat cushion)

• When it detects for 4 seconds that the temperature of the thermal electric 

device is 110

°

C or more, stops the output to the thermal electric device, 

activates climate the controlled seat blower motor in the maximum posi-
tion, and sends the external airflow for 30 seconds

• If the temperature does not become 105

°

C or less after 30 seconds pass, 

it stops all output and enters the system OFF condition

• When the temperature of the thermal electric device becomes 105

°

C or 

less, the system recovers automatically

• If it detects that the temperature of the thermal electric device is 110

°

C 

or more after the automatic system recovery, it immediately stops all out-
put and enters the system OFF condition

The temperature of the thermal electric device is 45

°

C or 

more in the COOL mode (any thermal electric device in 
the seatback or seat cushion)

• When it detects for 4 seconds that the temperature of the thermal electric 

device is between 45

°

C and 70

°

C, it starts the temperature monitoring of 

the thermal electric device at 3 second intervals

• While monitoring, if it detects that the temperature raises 2

°

C or more 4 

times continuously or reaches 70

°

C or more, it stops all output and en-

ters the system OFF condition

• If it detects other results of monitoring, it continues activating in the 

COOL mode

Thermal electric device sensor system open circuit

• When it detects for 4 seconds that the thermal electric device sensor sys-

tem is an open circuit

Climate controlled seat blower motor system open circuit

• When it detects for 2 seconds that climate controlled seat blower motor 

system is an open circuit while the climate controlled seat is being acti-
vated, it stops output to the thermal electric device

• When it detects for 10 seconds that the climate controlled seat blower 

motor system is an open circuit while the climate controlled seat is being 
activated, it stops all output and enters the system OFF condition
NOTE:
After detecting the climate seat blower motor system open circuit for 2 
seconds, the system recovers automatically if the activation of the cli-
mate controlled seat blower motor is detected for 1 second or more.

Switch input out of the specified range

• When it detects for 4 seconds that the rotary switch input is 30% or less 

of the vehicle battery voltage, it stops all output and enters the system 
OFF condition

• When the switch input returns to a value within the specified range, the 

system recovers automatically

HEAT or COOL switch input out of the specified range

• When it detects for 4 seconds that rotary switch input is 6% or less of the 

vehicle battery voltage, it stops all output and enters the system OFF 
condition

• When the switch input returns to a value within the specified range, the 

system recovers automatically

System voltage out of range

• System voltage* of the climate controlled seat control unit is out of the 

operation range (8.5 V – 16.5 V)

CLIMATE CONTROLLED SEAT CONTROL UNIT

SE-65

< ECU DIAGNOSIS INFORMATION >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

When the system enters in the fail-safe mode again after performing resetting procedure, perform diagnosis.

SE-66

< SYMPTOM DIAGNOSIS >

CLIMATE CONTROLLED SEAT DOES NOT OPERATE.

SYMPTOM DIAGNOSIS

CLIMATE CONTROLLED SEAT DOES NOT OPERATE.

BOTH SIDES

BOTH SIDES : Diagnosis Procedure

INFOID:0000000005236640

1.

CHECK CLIMATE CONTROLLED CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check climate controlled control unit power supply and ground circuit.
Refer to 

SE-10, "CLIMATE CONTROLLED SEAT CONTROL UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CONFIRM THE OPERATION

Confirm the operation again.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-36, "Intermittent Incident"

.

NO

>> GO TO 1.

DRIVER SIDE

DRIVER SIDE : Diagnosis Procedure

INFOID:0000000005236641

1.

CHECK CLOMATE CONTROLLED SEAT CONTROL UNIT POWER SUPPLY CIRCUIT

Check climate controlled seat control unit power supply circuit.
Refer to 

SE-10, "CLIMATE CONTROLLED SEAT CONTROL UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK CLIMATE CONTROLLED SEAT SWITCH

Check climate controlled seat switch.
Refer to 

SE-14, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning parts.

3.

CHECK CLIMATE CONTROLLED SEAT BLOWER MOTOR

Check climate controlled seat blower motor.
Refer to 

SE-25, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning parts.

4.

CONFIRM THE OPERATION

Confirm the operation again.
Is the inspection result normal?

YES

>> Check intermittent incident. Refer to

GI-36, "Intermittent Incident"

.

NO

>> GO TO 1.

PASSENGER SIDE

PASSENGER SIDE : Diagnosis Procedure

INFOID:0000000005236642

1.

CHECK CLIMATE CONTROLLED SEAT CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check climate controlled seat control unit power supply circuit.

CLIMATE CONTROLLED SEAT DOES NOT OPERATE.

SE-67

< SYMPTOM DIAGNOSIS >

C

D

E

F

G

H

I

K

L

M

A

B

SE

N

O

P

Refer to 

SE-10, "CLIMATE CONTROLLED SEAT CONTROL UNIT : Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK CLIMATE CONTROLLED SEAT SWITCH

Check climate controlled seat switch.
Refer to 

SE-14, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning parts.

3.

CHECK CLIMATE CONTROLLED SEAT BLOWER MOTOR

Check climate controlled seat blower motor.
Refer to 

SE-25, "Component Function Check"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace the malfunctioning parts.

4.

CONFIRM THE OPERATION

Confirm the operation again.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-36, "Intermittent Incident"

.

NO

>> GO TO 1.