Inspection Procedure 2: Steering wheel audio remote control switch illumination does not come on.


caution Before replacing the radio and CD player, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of steering wheel audio remote control switch
  • Malfunctions of combination meter
  • Malfunction of the clock spring
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-301 steering wheel audio remote control switch connector

Q. Is the check result normal?
Go to Step 2.
Repair the defective connector.

STEP 2. Voltage measurement at C-301 steering wheel audio remote control switch connector.
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Turn the ignition switch to the "ACC" position, and turn the tail lamp switch to the "ON" position.
(3)Measure the voltage between terminal No.4 and body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 3.
Go to Step 5.

STEP 3. Check the wiring harness between C-301 steering wheel audio remote control switch connector terminal No.4 and body earth.

  • Check the earth wire for open circuit.

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Check the steering wheel audio remote control switch.
Illumination check. (Refer to .)

Q. Is the check result normal?
Go to Step 10.
Replace the steering wheel audio remote control switch.

STEP 5. Connector check: C-304 and C-312 clock spring connectors

Q. Is the check result normal?
Go to Step 6.
Repair the defective connector.

STEP 6. Check the clock spring.
Check whether the clock spring is in good condition (Refer to GROUP 52B - Driver’s Air bag module and clock spring ).

Q. Is the check result normal?
Go to Step 7.
Replace the clock spring.

STEP 7. Check the wiring harness between C-301 steering wheel audio remote control switch connector terminal No.3 and C-304 clock spring connector terminal No.5.

  • Check the power supply line open and short circuit.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness.

STEP 8. Connector check: C-203 combination meter connector

Q. Is the check result normal?
Go to Step 9.
Repair the defective connector.

STEP 9. Check the wiring harness between C-203 combination meter connector terminal No.23 and C-312 clock spring connector terminal No.5.

  • Check the power supply line open and short circuit.
note Prior to the wiring harness inspection, check joint connector C-04, and repair if necessary.

Q. Is the check result normal?

    Go to Step 10.
Repair the wiring harness.

STEP 10. Retest the system
Check whether the illumination of the steering wheel audio remote control switch comes on normally.

Q. Is the check result normal?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the steering wheel audio remote control switch.