Inspection Procedure 2

Inspection Procedure 2: Steering Wheel Audio Remote Control Switch does not Function. [Vehicles with MMCS]

CAUTION: Before replacing the multivision display, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

Steering Audio Switch Circuit (Part 1):

Steering Audio Switch Circuit (Part 2):

TECHNICAL DESCRIPTION (COMMENT)

The communication circuit to the steering remote control switch, the steering wheel audio remote control switch, the multivision display, or the clock spring may be defective.

TROUBLESHOOTING HINTS

- Steering wheel audio remote control switch may be defective
- Multivision display may be defective
- Clock spring may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check the steering wheel audio remote control switch.

Remove the steering wheel audio remote control switch. Then check continuity between the switch terminals.







Q: Is the steering wheel audio remote control switch in good condition?

YES : Go to Step 2.

NO : Replace the steering wheel audio remote control switch.

STEP 2. Check clock spring connector C-204 and C-205 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Are clock spring connector C-204 and C-205 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component. The steering remote control switch should work normally.

STEP 3. Check the clock spring.

Check whether the clock spring is in good condition (Refer to Driver's Air Bag Module and Clock Spring [EXCEPT RALLIART] or [RALLIART]). Driver's Air Bag Module and Clock Spring

Q: Is the check result normal?

YES : Go to Step 4.

NO : Replace the clock spring.

STEP 4. Check multivision display connector C-12 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is multivision display connector C-12 in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component.

STEP 5. Check the wiring harness between multivision display connector C-12 (terminal 53, 69) and clock spring connector C-205 (terminal 2, 3).

- Check the communication lines for open and short circuit.

NOTE: Also check intermediate connector C-105 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-105 is damaged, repair or replace the connector.

Q: Is the wiring harness between multivision display connector C-12 (terminal 53, 69) and clock spring connector C-205 (terminal 2, 3) in good condition?

YES : Go to Step 6.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

STEP 6. Check steering wheel audio remote control switch connector C-202 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is steering wheel audio remote control switch connector C-202 in good condition?

YES : Go to Step 7.

NO : Repair or replace the damaged component. The steering remote control switch should work normally.

STEP 7. Check the wiring harness between steering wheel audio remote control switch connector C-202 (terminal 2, 4) and clock spring connector C-204 (terminal 5, 4).

- Check the communication lines for open and short circuit.

Q: Is the wiring harness between steering wheel audio remote control switch connector C-202 (terminal 2, 4) and clock spring connector C-204 (terminal 5, 4) in good condition?

YES : Go to Step 8.

NO : The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary.

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?

YES : The trouble can be an intermittent malfunction. (Refer to How to use Troubleshooting/inspection sevice points - How to cope with Intermittent Malfunction).

NO : Replace the multivision display.