Inspection Procedure 4
Inspection Procedure 4: Even When The Steering Wheel Voice Control Switch Is Operated, The Conversation Is Not Possible.Steering Voice Control Switch Circuit <Vehicles Without MMCS>:
Steering Voice Control Switch Circuit <Vehicles With MMCS>:
FUNCTION
When the steering wheel voice-control switch is operated, the switch signal is transmitted to the radio and CD changer
TROUBLE JUDGMENT CONDITIONS
If the conversation is not possible even when the steering wheel voice control switch is operated, the steering wheel voice control switch or radio and CD changer
TROUBLESHOOTING HINTS
- Malfunction of the steering wheel voice control switch
- Malfunction of the hands free module
- Malfunction of the radio and CD changer vehicles without MMCS> or audio visual navigation unit
- Damaged harness wires and connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Check the steering audio switch.
Check that the radio and CD changer
Q: Is it possible to normally operate the radio and CD changer
YES : Go to Step 2.
NO : Diagnose the steering audio switch. Refer to
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
1. Turn the ignition switch to "ON" position.
2. Diagnose the CAN bus line.
3. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 3.
NO : Repair the CAN bus line. (Refer to Controller area network, Diagnosis.)
STEP 3. Check the steering wheel voice control switch.
Remove the steering wheel voice control switch. Then check continuity between the switch terminals.
Q: Is the steering wheel voice control switch in good condition?
YES : Go to Step 4.
NO : Replace the steering wheel voice control switch.
STEP 4. 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 5.
NO : Replace the steering wheel audio remote control switch.
STEP 5. Check steering wheel voice control switch connector C-206 and steering audio switch connector C-213 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are steering wheel voice control switch connector C-206 and steering audio switch connector C-213 in good condition?
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer to general (electrical), Harness Connector Inspection. The steering remote control switch should work normally.
STEP 6. Check the wiring harness between steering wheel voice control switch connector C-206 (terminal 3) and steering audio switch connector C-213 (terminal 3).
- Check the communication lines for open circuit and short circuit.
Q: Is the wiring harness between steering wheel voice control switch connector C-206 (terminal 3) and steering audio switch connector C-213 (terminal 3) in good condition?
YES : Go to Step 7.
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 7. Check the wiring harness between steering wheel voice control switch connector C-206 (terminal 2) and clock spring connector C-202 (terminal 4).
- Check the communication lines for open circuit and short circuit.
Q: Is the wiring harness between steering wheel voice control switch connector C-206 (terminal 2) and clock spring connector C-202 (terminal 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 that the hands-free cellular phone system works normally when the steering wheel voice control switch is operated.
Q: Check that the hands-free cellular phone system works normally when the steering wheel voice control switch is operated.
YES : The trouble can be an intermittent malfunction (Refer to general (Body and Chassis), How to use troubleshooting/inspection Service Points, How to Cope with Intermittent Malfunction).
NO : Replace the radio and CD changer