Inspection Procedure 1: Steering wheel audio remote control switch does not function. <Vehicles with MMCS>


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 multivision display
  • Malfunction of the clock spring
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the steering wheel audio remote control switch.
Check the continuity of the steering wheel audio remote control switch (Refer to ).

Q. Is the check result normal?
Go to Step 2.
Replace the steering wheel audio remote control switch.

STEP 2. Connector check: C-312 and C-304 clock spring connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. 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 4.
Replace the clock spring.

STEP 4. Connector check: C-104 multivision display connector

Q. Is the check result normal?
Go to Step 5.
Repair the defective connector.

STEP 5. Check the wiring harness between C-104 multivision display connector terminal No.22, 32 and C-312 clock spring connector terminal No.2, 3.

  • Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?
Go to Step 6.
Repair the wiring harness.

STEP 6. Connector check: C-301 steering wheel audio remote control switch connector

Q. Is the check result normal?
Go to Step 7.
Repair the defective connector.

STEP 7. Check the wiring harness between C-301 steering wheel audio remote control switch connector terminal No.1, 2 and C-304 clock spring connector terminal No.2, 3.

  • Check the communication lines for open circuit and short circuit.

Q. Is the check result normal?

    Go to Step 8.
Repair the wiring harness.

STEP 8. Retest the system
Check whether you can operate the multivision display by using the steering wheel audio remote control switch.

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 multivision display.