Inspection Procedure 1: Steering Wheel Remote Control Switch (Audio Remote Control Switch) Does Not Function. < Vehicles With MMCS >: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe

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 CHECK  ).

   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 DRIVER'S 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 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 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 multivision display.