TEMPERATURE FOR SEAT WARMER SYSTEM CANNOT BE ADJUSTED [SEAT WARMER SYSTEM]

id0903m2971000

Description

•  The temperature for the seat warmer cannot be adjusted (temperature level cannot be switched).

•  The seat warmer temperature continues to rise.

Possible Causes

•  Seat warmer switch malfunction

•  Thermistor (built into seat warmer unit (seat cushion side)) malfunction

•  Seat warmer control unit malfunction

Diagnostic Procedure

Step

Inspection

Action

1

DETERMINE IF MALFUNCTION CAUSE IS SEAT WARMER SWITCH

•  Switch the ignition ON (engine off or on).

•  Set the seat warmer switch to any one of the temperature settings.

•  Is the LED turned on according to the seat warmer switch operation?

Yes

Go to the next step.

No

Inspect the indicator unit.

(See INDICATOR UNIT INSPECTION.)

2

VERIFY IF MALFUNCTION CAUSE IS SEAT WARMER UNIT

•  Switch the ignition OFF.

•  Inspect the thermistor built into the seat warmer unit (seat cushion side).
(See SEAT WARMER UNIT INSPECTION.)

•  Is the seat warmer unit normal?

Yes

Replace the seat warmer control unit, then go to the next step.

(See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)

No

Replace the seat warmer unit (front seat cushion pad or front seat back pad) which there is a malfunction, then go to the next step.

(See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)

(See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)

3

VERIFY IF MALFUNCTION CAUSE IS CORRECTED

•  Switch the ignition ON (engine off or on).

•  Operate the seat warmer switch to turn on the seat warmer system.

•  Does the seat warmer system operate normally?

Yes

Troubleshooting completed. (Explain the contents of the servicing to the customer.)

No

Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.

(See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)

Description	• The temperature for the seat warmer cannot be adjusted (temperature level cannot be switched). • The seat warmer temperature continues to rise.
Possible Causes	• Seat warmer switch malfunction • Thermistor (built into seat warmer unit (seat cushion side)) malfunction • Seat warmer control unit malfunction

Step	Inspection		Action
1	DETERMINE IF MALFUNCTION CAUSE IS SEAT WARMER SWITCH • Switch the ignition ON (engine off or on). • Set the seat warmer switch to any one of the temperature settings. • Is the LED turned on according to the seat warmer switch operation?	Yes	Go to the next step.
1		No	Inspect the indicator unit. (See INDICATOR UNIT INSPECTION.)
2	VERIFY IF MALFUNCTION CAUSE IS SEAT WARMER UNIT • Switch the ignition OFF. • Inspect the thermistor built into the seat warmer unit (seat cushion side). (See SEAT WARMER UNIT INSPECTION.) • Is the seat warmer unit normal?	Yes	Replace the seat warmer control unit, then go to the next step. (See SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION.)
2		No	Replace the seat warmer unit (front seat cushion pad or front seat back pad) which there is a malfunction, then go to the next step. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.) (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
3	VERIFY IF MALFUNCTION CAUSE IS CORRECTED • Switch the ignition ON (engine off or on). • Operate the seat warmer switch to turn on the seat warmer system. • Does the seat warmer system operate normally?	Yes	Troubleshooting completed. (Explain the contents of the servicing to the customer.)
3		No	Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis. (See SYMPTOM TROUBLESHOOTING [SEAT WARMER SYSTEM].)