Component Tests and General Diagnostics

HEATED STEERING WHEEL SWITCH INDICATOR LAMP

Component Function Check


1. CHECK HEATED STEERING WHEEL INDICATOR LAMP

1.Turn power switch ON.
2.Turn heated steering wheel switch ON.
Does heated steering wheel indicator lamp turn on the lamp?
YES- GO TO 2.
NO- Go to "Diagnosis Procedure" .

2. CHECK HEATED STEERING WHEEL INDICATOR LAMP

Turn heated steering wheel switch OFF.
Does heated steering wheel indicator lamp turn off the lamp?
YES- INSPECTION END
NO- Go to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK POWER SOURCE

1.Turn power switch ON.
2.Turn heated steering wheel switch ON.
3.Check voltage between heated steering wheel switch harness connector terminals.





Is the inspection result normal?
YES- GO TO 7.
NO- GO TO 2.

2. CHECK GROUND CIRCUIT

1.Turn power switch OFF.
2.Disconnect heated steering wheel switch connector. Refer to "Removal and Installation" Heated Steering Wheel Switch.
3.Check continuity between heated steering wheel switch harness connector terminal and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace damaged parts.

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

SWITCH
1.Disconnect heated steering wheel relay connector. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.
2.Check continuity between heated steering wheel relay harness connector terminal and heated steering wheel switch harness connector terminal.





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





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

4. 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 5.
NO- Replace heated steering wheel relay. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.

5. 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 6.
NO- Repair or replace damaged parts.

6. 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 7.
NO- Repair or replace damaged parts.

7. 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.


Component Inspection (Heated Steering Wheel Switch)


1. CHECK HEATED STEERING WHEEL SWITCH

1.Turn power switch OFF.
2.Remove the heated steering wheel switch. Refer to "Removal and Installation" Heated Steering Wheel Switch.
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. Refer to "Removal and Installation" Heated Steering Wheel Switch.

2. CHECK HEATED STEERING WHEEL SWITCH INDICATOR LAMP

Apply a voltage of 12V between the heated steering wheel switch connector terminals to check that the indicator lamp turns ON.

CAUTION:
- Connect the fuse between the terminals when applying the voltage.
- To prevent damage, always observe the correct polarity.
- Prevent short-circuit.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace heated steering wheel switch. Refer to "Removal and Installation" Heated Steering Wheel Switch.


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.
- To prevent damage, always observe the correct polarity.
- Prevent short-circuit.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace heated steering wheel relay. Refer to "HEATED STEERING WHEEL SYSTEM : Component Parts Location" Locations.