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 AND GROUND CIRCUIT
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. Heated Steering Wheel System.
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. Heated Steering Wheel.
3. Disconnect heated steering wheel switch connector. 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. Heated Steering Wheel System.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace heated steering wheel relay. Heated Steering Wheel.
6.DETECT MALFUNCTIONING ITEM
Check the following.
- Battery
- Harness for short or open between battery and IPDM E/R. Battery Power Supply, "Wiring Diagram - BATTERY
POWER SUPPLY -".
- 10A fuse (No.76, located in the IPDM E/R). Fuse, Connector And Terminal Arrangement.
- IPDM E/R
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 HEATED STEERING WHEEL
SWITCH
1. Check continuity between heated steering wheel relay harness connector terminal and heated steering wheel switch 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 FUSE BLOCK (J/B) AND HEATED STEERING WHEEL SWITCH
1. Check continuity between fuse block (J/B) connector terminal and heated steering wheel switch harness connector terminal.





2. Check continuity between fuse block (J/B) harness connector terminal and ground.





Is the inspection result normal?
YES - GO TO 10.
NO - Repair or replace damaged parts.
10.DETECT MALFUNCTIONING ITEM
Check the following.
- Ignition switch
- Harness for short or open between ignition switch and fuse block (J/B). .
- 10A fuse [No.3, located in the fuse block (J/B)]. Fuse, Connector And Terminal Arrangement.
- Fuse block (J/B)
Is the inspection result normal?
YES - Replace heated steering wheel switch. Removal And Installation.
NO - Repair or replace damaged parts.