Heated Seat Control Unit

POWER SUPPLY AND GROUND CIRCUIT


HEATED SEAT CONTROL UNIT : Diagnosis Procedure

1.CHECK FUSE
Check that the following fuse is not fusing.





Is the inspection result normal?
YES - GO TO 2.
NO - Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK POWER SUPPLY 1
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector.
3. Turn ignition switch ON.
4. Check voltage between heated seat control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - GO TO 3.
3.CHECK POWER SUPPLY CIRCUIT 1
1. Turn ignition switch OFF.
2. Disconnect heated seat relay.
3. Check continuity between heated seat control unit harness connector and heated seat relay terminal connector.





4. Check continuity between heated seat control unit harness connector and ground.





Is the inspection result normal?
YES - Check heat seat relay. Component Function Check.
NO - Repair or replace harness.
4.CHECK POWER SUPPLY 2
Check voltage between heated seat control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 7.
NO - GO TO 5.
5.CHECK POWER SUPPLY CIRCUIT 2
1. Turn ignition switch OFF.
2. Disconnect heated seat switch connector.
3. Check continuity between heated seat control unit harness connector and heated seat switch harness connector.





4. Check continuity between heated seat control unit harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness.
6.CHECK HEATED SEAT SWITCH
Check heated seat switch.
- Driver side: Component Inspection.
- Passenger side: Component Inspection.
Is the inspection result normal?
YES - GO TO 8.
NO - Replace heated seat switch. Removal and Installation.
7.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between heated seat control unit harness connector and ground.





Is the inspection result normal?
YES - INSPECTION END
NO - Repair or replace harness.
8.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Intermittent Incident.
- INSPECTION END