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Inspection Procedure 1: Steering wheel remote control switch audio remote control switch, hands-free cellular phone system switch does not function.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
The power supply circuit to the steering wheel remote control switch (audio remote control switch), the steering wheel remote control switch, the radio and CD player <vehicles with radio and CD player>, the multivision display <vehicles with smartphone link display audio>, or the clock spring may be defective.
 
 
 
TROUBLESHOOTING HINTS
  • The steering wheel remote control switch may be defective
  • The radio and CD player <Vehicles with radio and CD player> may be defective
  • The multivision display <Vehicles with smartphone link display audio> may be defective
  • The clock spring may be defective
  • Damaged harness wires and connectors
 
 
 
 
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 ).
Is the check result normal?
Go to Step 2.
Replace the steering wheel remote control switch.
 
STEP 2. Check the clock spring.
Check whether the clock spring is in good condition. Refer to GROUP 52B - Air bag module and clock spring .
Is the check result normal?
Go to Step 3.
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.
Is the check result normal?
Go to Step 4.
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.
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 radio and CD player <vehicles with radio and CD player> or multivision display <vehicles with smartphone link display audio>.