Heated Steering Wheel System

HEATED STEERING WHEEL SYSTEM

Component Function Check


1. CHECK HEATED STEERING WHEEL SYSTEM

Check operation of heated steering wheel system. Refer to "HEATED STEERING WHEEL SYSTEM : System Description" System Description.
Is the inspection result normal?
YES- Inspection End.
NO- Go to "Diagnosis Procedure" .


Diagnosis Procedure

Regarding Wiring Diagram information, refer to "Wiring Diagram" [1][2]Electrical Diagrams.

1. CHECK POWER CIRCUIT

1.Turn ignition switch OFF.
2.Remove the steering wheel. Refer to "Removal and Installation" Removal And Installation.
3.Turn ignition switch ON.
4.Turn heated steering wheel switch ON.
5.Check voltage between heated steering wheel harness connector M114.





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)" .
Is the inspection result normal?
YES- Inspection End.
NO- Replace heated steering wheel. Refer to "Removal and Installation" Removal And Installation.

3. CHECK GROUND CIRCUIT

Check continuity between heated steering wheel harness connector terminal M114 and ground.





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

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

1.Turn ignition switch OFF.
2.Disconnect heated steering wheel relay connector.
3.Check continuity between heated steering wheel relay harness connector terminal M90 and steering wheel harness connector terminal M114.





4.Check continuity between heated steering wheel relay harness connector terminal M90 and ground.





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

5. CHECK HEATED STEERING RELAY

Check heated steering relay. Refer to "Component Inspection (Heated Steering Relay)" .
Is the inspection result normal?
YES- GO TO 6.
NO- Replace heated steering relay.

6. CHECK POWER TO HEATED STEERING RELAY

Check the following.
- Battery
- Harness for open or short between battery and 10A fuse (No. 2)
- 10A fuse (No. 2)
- Harness for open or short between 10A fuse (No. 2) and heated steering relay
Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace damaged parts.

7. CHECK GROUND CIRCUIT

1.Disconnect heated steering wheel switch.
2.Check continuity between heated steering wheel switch harness connector terminal M51 and ground.





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

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

1.Disconnect A/C auto amp.
2.Check continuity between heated steering wheel relay harness connector terminal M90 and A/C auto amp. harness connector terminal M152.





3.Check continuity between heated steering relay harness connector terminal M90 and ground.





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

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

1.Check continuity between A/C auto amp. harness connector terminal M152 and heated steering wheel switch harness connector M51.





2.Check continuity between A/C auto amp. harness connector M152 and ground.





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

10. CHECK HEATED STEERING WHEEL SWITCH

Check heated steering wheel switch. Refer to "Component Inspection (Heated Steering Wheel Switch)" .
Is the inspection result normal?
YES- Replace A/C Auto amp. Refer to "Removal and Installation" Removal And Installation.
NO- Replace heated steering wheel switch.


Component Inspection (Heated Steering Wheel Switch)


1. CHECK HEATED STEERING WHEEL SWITCH

1.Turn ignition switch OFF.
2.Remove the heated steering wheel switch connector M51.
3.Check continuity between heated steering wheel switch terminals.





Is the inspection result normal?
YES- GO TO 2.
NO- Replace heated steering wheel switch.

2. CHECK HEATED STEERING WHEEL SWITCH INDICATOR LAMP

Apply 12V direct current between heated steering wheel switch terminals and check that the indicator lamp turns ON.





Is the inspection result normal?
YES- Inspection End.
NO- Replace heated steering wheel switch.


Component Inspection (Heated Steering Relay)


1. CHECK HEATED STEERING RELAY CONTINUITY

1.Turn ignition switch OFF.
2.Remove heated steering relay. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.
3.Apply 12V direct current between heated steering relay terminals and check continuity.





Is the inspection result normal?
YES- Inspection End.
NO- Replace heated steering wheel relay.


Component Inspection (Heated Steering Wheel)


1. CHECK HEATED STEERING WHEEL CONTINUITY

1.Turn ignition switch OFF.
2.Remove the steering wheel. Refer to "Removal and Installation" Removal And Installation.
3.Check continuity between steering wheel connector terminals.





Is the inspection result normal?
YES- GO TO 2.
NO- Replace heated steering wheel.

2. CHECK HEATED STEERING WHEEL RESISTANCE

Check resistance between heated steering wheel connector terminals.





Is the inspection result normal?
YES- Inspection End.
NO- Replace heated steering wheel. Refer to "Removal and Installation" Removal And Installation.