Inspection Procedure 4: Even When The Steering Wheel Voice Control Switch Is Operated, The Conversation Is Not Possible: Diagnosis

Required Special Tools: 

• MB991223: Harness Set
• MB992006: Extra Fine Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: Vehicle 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)

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

   Check that the radio and CD player < vehicles without MMCS > or multivision display < vehicles with MMCS > can be operated normally using the steering wheel audio remote control switch.

   Q: Is it possible to normally operate the radio and CD player < vehicles without MMCS > or multivision display < vehicles with MMCS > using the steering wheel audio remote control switch? 

   YES  : Go to Step 2.

   NO  : Diagnose the steering wheel audio remote control switch (Refer to < VEHICLES WITHOUT MMCS > or < VEHICLES WITH MMCS > ).

2. STEP 2. Using scan tool MB991958, diagnose the CAN bus line. 
   CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
   1. Connect scan tool MB991958. Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-III)  ".
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line.
   4. 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 DIAGNOSIS ).

   Fig 1: Connecting Special Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. STEP 3. Check the steering wheel voice control switch. 

   Remove the steering wheel voice control switch. Then check continuity between the switch terminals. (Refer to STEERING WHEEL VOICE CONTROL SWITCH  )

   Q: Is the steering wheel voice control switch in good condition? 

   YES  : Go to Step 4.

   NO  : Replace the steering wheel voice control switch.

4. 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. (Refer to STEERING WHEEL AUDIO REMOTE CONTROL SWITCH INSPECTION  )

   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.

5. STEP 5. Check steering wheel voice control switch connector C-206 and steering wheel audio remote control 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 wheel audio remote control switch connector C-213 in good condition? 

   YES  : Go to Step 6.

   NO  : Repair or replace the damaged component(s). Refer to HARNESS CONNECTOR INSPECTION . The steering remote control switch should work normally.

6. STEP 6. Check the wiring harness between steering wheel voice control switch connector C-206 (terminal 3) and steering wheel audio remote control 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 wheel audio remote control 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.

7. 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.

8. 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 HOW TO COPE WITH INTERMITTENT MALFUNCTION ).

   NO  : Replace the radio and CD player < vehicles without MMCS > or multivision display < vehicles with MMCS >.