INSPECTION PROCEDURE 1: Steering Wheel Remote Control Switch Audio Remote Control Switch, Hands-Free Cellular Phone System Switch Does Not Function: Diagnosis
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- 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.
- STEP 2. Check the clock spring.
Check whether the clock spring is in good condition. Refer to CLOCK SPRING .
Q: Is the check result normal?
YES: Go to Step 3.
NO: Replace the clock spring.
- STEP 3. Check of short to power supply, short to ground, and open circuit in SW1 and SWG lines between radio and CD player <vehicles with radio and CD player> or multivision display <vehicles with smartphone link display audio> 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.
- STEP 4. Retest the system.
Check whether you can operate the radio and CD player <vehicles with radio and CD player> or multivision display <vehicles with smartphone link display audio> 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 MALFUNCTIONS ).
NO: Replace the radio and CD player <vehicles with radio and CD player> or multivision display <vehicles with smartphone link display audio>.