INSPECTION PROCEDURE 1: Steering wheel remote control switch (audio remote control switch) does not function: Diagnosis

Required Special Tools: 

• MB992006: Extra fine probe
• MB991223: Harness set

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

   Check the steering wheel remote control switch (Refer to STEERING WHEEL AUDIO REMOTE CONTROL SWITCH ).

   Q: Is the check result normal? 

   • YES:  Go to Step  2.
   • NO:  Replace the steering wheel remote control switch.
2. STEP 2. Check the clock spring. 

   Check whether the clock spring is in good condition. Refer to AIR BAG MODULE AND CLOCK SPRING .

   Q: Is the check result normal? 

   • YES:  Go to Step  3.
   • NO:  Replace the clock spring.
3. STEP 3. Check of short to power supply, short to ground, and open circuit in REM+, REM- line between radio and CD player connector or multivision display connector and steering wheel remote control switch connector. 

   Q: Is the check result normal? 

   • YES:  Go to Step  4.
   • NO:  Repair the connector(s) or wiring harness.
4. STEP 4. Retest the system. 

   Check whether you can operate the radio and CD player or multivision display by using the steering wheel remote control switch.

   Q: Is the check result normal? 

   • YES:  The trouble can be an intermittent malfunction (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .
   • NO:  Replace the radio and CD player or multivision display.