Diagnostic Procedure

FRONT SEAT WARMER CONTROL UNIT INSPECTION DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	PERFORM DTC INSPECTION Verify the instrument cluster DTC inspection. (See DTC INSPECTION [INSTRUMENT CLUSTER] .) Are DTCs and error codes output?	Yes	Perform the diagnosis according to the inspection procedure for each code. (See DTC TABLE [INSTRUMENT CLUSTER] .)
1		No	Go to the next step.
2	DETERMINE IF THE MALFUNCTION CAUSE IS THE FRONT SEAT WARMER SWITCH Select either Low, Mid, or High on the front seat warmer switch. Does the front seat warmer switch LED illuminate?	Yes	Go to the next step.
2		No	Inspect the indicator unit. (See INDICATOR UNIT INSPECTION .)
3	DETERMINE MALFUNCTIONING SYSTEM Does either the left or right front seat warmer operate?	Yes	Go to step 9.
3		No	Go to the next step.
4	INSPECT THE FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY FUSE Inspect the SEAT WARM 20 A fuse. Is the fuse normal?	Yes	Go to the next step.
4		No	If the fuse is deterioration: Replace the malfunctioning fuse. If the fuse is blown Repair the short to ground in wiring harness between the following terminals: SEAT WARM 20 A fuse and front seat warmer control unit terminal D SEAT WARM 20 A fuse and front seat warmer control unit terminal C
5*	DETERMINE IF CAUSE OF MALFUNCTION IS CONTROLLER POWER SUPPLY WIRING HARNESS FOR FRONT SEAT WARMER OR OTHER CAUSE Switch the ignition off (LOCK). Disconnect the front seat warmer control unit connector. Measure the voltage at the following terminal (wiring harness-side): Front seat warmer control unit terminal D Front seat warmer control unit terminal C Is the voltage B+?	Yes	Go to the next step.
5*		No	Repair or replace the open circuit at the following wiring harness. SEAT WARM 20 A fuse and front seat warmer control unit terminal D SEAT WARM 20 A fuse and front seat warmer control unit terminal C
6*	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY WIRING HARNESS Front seat warmer control unit connector are disconnected. Switch the ignition ON (engine off or on). Measure the voltage at the following terminal (wiring harness-side): Front seat warmer control unit terminal I Is the voltage B+?	Yes	Go to the next step.
6*		No	Repair or replace the open circuit at the following wiring harness. C/U IG1 15A fuse and front seat warmer control unit terminal I
7*	INSPECT FOR OPEN CIRCUIT IN FRONT SEAT WARMER CONTROL UNIT GROUND CIRCUIT Front seat warmer control unit connector on the side that is not operating is disconnected. Inspect for continuity between the following terminals (wiring harness-side): Front seat warmer control unit terminal on the side that is not operating T and body ground Front seat warmer control unit terminal on the side that is not operating S and body ground Is there continuity?	Yes	Go to the next step.
7*		No	Inspect the open circuit following. Front seat warmer unit terminal T and body ground Front seat warmer unit terminal S and body ground Inspect the body ground connector terminals for poor connection. Repair or replace the malfunction.
8*	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS OF FRONT SEAT WARMER SWITCH SIGNAL Front seat warmer control unit connector is disconnected. Inspect for continuity between the following terminals (wiring harness-side): Front seat warmer control unit terminal F and indicator unit terminal D Is there continuity?	Yes	Go to the next step.
8*		No	Inspect the open circuit following. Front seat warmer control unit terminal F and indicator unit terminal D
9*	INSPECT FRONT SEAT WARMER CONTROL UNIT AND FRONT SEAT WARMER UNIT CONNECTOR Disconnect the front seat warmer control unit and front seat warmer unit connector on the side not operating. Inspect the front seat warmer control unit and front seat warmer unit connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the malfunctions.
9*		No	Go to the next step.
10*	VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS OF FRONT SEAT WARMER UNIT CIRCUIT Switch the ignition off (LOCK). Disconnect the front seat warmer control unit connector. Inspect for continuity between the following terminals (wiring harness-side): Driver-side front seat warmer unit terminal A and Q Passenger-side front seat warmer unit terminal B and R Is there continuity?	Yes	Go to the next step.
10*		No	Replace the front seat back pad or front seat cushion pad. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION .) (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)
11	DETERMINE IF THE MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT Replace the indicator unit. (See INDICATOR UNIT REMOVAL/INSTALLATION .) Does the front seat warmer system operate?	Yes	Troubleshooting completed.
11		No	Replace the front seat back pad or front seat cushion pad. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION .) (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)

FRONT SEAT WARMER CONTROL UNIT INSPECTION DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1*	INSPECT SEAT WARMER UNIT CIRCUIT FOR SHORT TO POWER SUPPLY Disconnect the seat warmer unit connector. Measure the voltage between seat warmer control unit terminal R and body ground. Measure the voltage between driver-side seat warmer unit terminal 6B and body ground. Is the voltage 1. 0 or more?	Yes	Repair or replace for a short to ground in the wiring harness.
1*		No	Go to the next step.
2	INSPECT SEAT WARMER UNIT Inspect the seat warmer unit. (See FRONT SEAT WARMER UNIT INSPECTION .) Is the seat warmer unit normal?	Yes	Go to the next step.
2		No	Replace the front seat back pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION .)
3	INSPECT CLIMATE CONTROL UNIT (WITH FULLAUTO AIR CONDITIONER)/INDICATOR UNIT (WITH MANUAL AIR CONDITIONER) Inspect the climate control unit (with full-auto air conditioner)/indicator unit (with manual air conditioner). (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER] .) (See INDICATOR UNIT INSPECTION .) Is the climate control unit (with full-auto air conditioner)/indicator unit (with manual air conditioner) normal?	Yes	Replace the seat warmer control unit. (See FRONT SEAT WARMER CONTROL UNIT REMOVAL/INSTALLATION .)
3		No	Replace the climate control unit (with full-auto air conditioner)/indicator unit (with manual air conditioner). (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER] .) (See INDICATOR UNIT REMOVAL/INSTALLATION .)