Heated Steering Wheel System

HEATED STEERING WHEEL SYSTEM





Component Function Check
1.CHECK HEATED STEERING WHEEL SYSTEM
Check operate heated steering wheel system. System Description (Heated Steering Wheel).
Is the inspection result normal?
YES - INSPECTION END
NO - Go to SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK POWER SOURCE
1. Turn ignition switch OFF.
2. Remove the heated steering wheel. Removal And Installation.
3. Turn ignition switch ON.

CAUTION:
Never start the engine.
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. SEE Component Inspection (Heated Steering Wheel).
Is the inspection result normal?
YES - INSPECTION END
NO - Replace heated steering wheel. Removal And Installation.
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 ignition switch OFF.
2. Disconnect heated steering wheel relay connector. Component Parts.
3. Remove the heated steering wheel. Removal And Installation.
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. SEE Component Inspection (Heated Steering Wheel Relay).
Is the inspection result normal?
YES - GO TO 6.
NO - Replace heated steering wheel relay. Component Parts.
6.CHECK POWER SOURCE (BATTERY)
Check the following.
- Battery
- Harness for short or open between battery and fuse block (J/B). Battery Power Supply.
- 15A fuse [No. 5, located in the fuse block (J/B)]. Fuse Block - Junction Box (J/B).
- Fuse block (J/B)
Is the inspection result normal?
YES - GO TO 7.
NO - Repair or replace damaged parts.
7.CHECK GROUND CIRCUIT
Check continuity between twin 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 TWIN SWITCH
1. Check continuity between A/C auto amp. harness connector terminal and twin 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. Heated Steering Wheel Switch.
Is the inspection result normal?
YES - Repair or replace A/C auto amp. Removal And Installation.
NO - Replace heated steering wheel switch. Service and Repair.




Component Inspection (Heated Steering Wheel Switch)
1.CHECK HEATED STEERING WHEEL SWITCH
1. Turn ignition switch OFF.
2. Remove the heated steering wheel switch. Service and Repair.
3. Check continuity between heated steering wheel switch harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 2.
NO - Replace heated steering wheel switch. Service and Repair.
2.CHECK HEATED STEERING WHEEL SWITCH INDICATOR LAMP
Check status between heated steering wheel switch connector terminals.

CAUTION:
Connect the fuse between the terminals when applying the voltage.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace heated steering wheel switch. Service and Repair.




Component Inspection (Heated Steering Wheel)
1.CHECK HEATED STEERING WHEEL CONTINUITY
1. Turn ignition switch OFF.
2. Remove the heated steering wheel. Removal And Installation.
3. Check continuity between heated steering wheel harness connector terminal and ground.





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




Component Inspection (Heated Steering Wheel Relay)
1.CHECK HEATED STEERING WHEEL RELAY CONTINUITY
Check continuity between heated steering wheel relay terminals.

CAUTION:
Connect the fuse between the terminals when applying the voltage.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace heated steering wheel relay. Component Parts.