Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect rear seat cushion heater connector.
3. Turn ignition switch ON.
4. Check voltage between rear seat cushion heater harness connector and ground.

   (+)			(-)	Condition		Voltage (V) (Approx.)
   Rear seat cushion heater
   Connector		Terminal
   LH	B643	3	Ground	Rear heated seat switch	HI/LO mode	12
   					Other than the above	0
   RH		1			HI/LO mode	12
   					Other than the above	0

Is the inspection result normal?

YES

GO TO 4.

NO

GO TO 2.

1. Turn ignition switch OFF.
2. Disconnect rear seatback heater connector.
3. Check continuity between rear seat cushion heater harness connector and rear seatback heater harness connector.

   Rear seat cushion heater			Rear seatback heater		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B643	3	B646	1	Existed
   RH		1	B645

4. Check continuity between rear seat cushion heater harness connector and ground.

   Rear seat cushion heater			Ground	Continuity
   Connector		Terminal
   LH	B643	3		Not existed
   RH		1

Is the inspection result normal?

YES

GO TO 3.

NO

Repair or replace harness.

1. Disconnect rear heated seat control unit connector.
2. Check continuity between rear seat cushion heater harness connector and rear heated seat control unit harness connector.

   Rear seat cushion heater			Rear heated seat control unit		Continuity
   Connector		Terminal	Connector	Terminal
   LH	B643	3	B647	12	Existed
   RH		1		2

3. Check continuity between rear seat cushion heater harness connector and ground.

   Rear seat cushion heater			Ground	Continuity
   Connector		Terminal
   LH	B643	3		Not existed
   RH		1

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace harness.

1. Turn ignition switch OFF.
2. Check continuity rear seat cushion heater harness connector and ground.

Is the inspection result normal?

YES

Replace rear seat cushion heater.

NO

Repair or replace harness.