Heated Steering Wheel System Does Not Activate

HEATED STEERING WHEEL SYSTEM DOES NOT ACTIVATE

Description

- The heated steering wheel does not warm up.
- The heated steering wheel system cannot be turned OFF.


Diagnosis Procedure


1. CHECK POWER SOURCE

1.Turn power switch OFF.
2.Remove the heated steering wheel. Refer to "Removal and Installation" With Heated Steering Wheel.
3.Turn power switch ON.
4.Turn heated steering wheel switch ON.
5.Check voltage between heated steering wheel harness connector terminals.





Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 3.

2. CHECK HEATED STEERING WHEEL

Check heated steering wheel. Refer to "Component Inspection (Heated Steering Wheel)" Heated Steering Wheel System.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace heated steering wheel. Refer to "Removal and Installation" With Heated Steering Wheel.

3. CHECK GROUND CIRCUIT

Check continuity between heated steering wheel harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace damaged parts.

4. CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND HEATED STEERING WHEEL

1.Turn power switch OFF.
2.Disconnect heated steering wheel relay connector. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.
3.Remove the heated steering wheel. Refer to "Removal and Installation" With Heated Steering Wheel.
4.Check continuity between heated steering wheel relay harness connector terminal and heated steering wheel harness connector terminal.





5.Check continuity between heated steering wheel relay harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace damaged parts.

5. CHECK HEATED STEERING WHEEL RELAY

Check heated steering wheel relay. Refer to "Component Inspection (Heated Steering Wheel Relay)" Heated Steering Wheel System.
Is the inspection result normal?
YES- GO TO 6.
NO- Replace heated steering wheel relay. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.

6. CHECK POWER SOURCE (BATTERY)

Check the following.
- 12V battery
- Harness for short or open between 12V battery and 15A fuse (No. 8)
- 15A fuse (No. 8)
- Harness for short or open between 15A fuse (No. 8) and heated steering wheel relay
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace damaged parts.

7. CHECK GROUND CIRCUIT

Check continuity between heated steering wheel switch harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace damaged parts.

8. CHECK HARNESS BETWEEN HEATED STEERING WHEEL RELAY AND A/C AUTO AMP.

1.Check continuity between heated steering wheel relay harness connector terminal and A/C auto amp.
harness connector terminal.





2.Check continuity between heated steering wheel relay harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace damaged parts.

9. CHECK HARNESS BETWEEN A/C AUTO AMP. AND HEATED STEERING WHEEL SWITCH

1.Check continuity between A/C auto amp. harness connector terminal and heated steering wheel switch harness connector terminal.





2.Check continuity between A/C auto amp. harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 10.
NO- Repair or replace damaged parts.

10. CHECK HEATED STEERING WHEEL SWITCH

Check heated steering wheel switch. Refer to "HEATED STEERING WHEEL SYSTEM : Heated Steering Wheel Switch" Heated Steering Wheel Switch.
Is the inspection result normal?
YES- Repair or replace A/C auto amp. Refer to "Removal and Installation" Service and Repair.
NO- Replace heated steering wheel switch. Refer to "Removal and Installation" Heated Steering Wheel Switch.