INSPECTION PROCEDURE 5: The multi-center display operation tone (beep sound) does not sound: Diagnosis

Required Special Tools: 

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
  • MB991824: V.C.I.
  • MB991827: M.U.T.-III USB Cable
  • MB991910: M.U.T.-III Main Harness A

1. STEP 1. Check that the multi-center display operation tone setting is set to With the operation tone. 

   Q: Is the setting of multi-center display operation tone set to With the operation tone? 

   YES:  Go to Step 2.

   NO:  Set the operation tone setting to With the operation tone. Check that the multi-center display operation tone (beep sound) is output.

2. STEP 2. Check that the ignition key reminder buzzer sounds normally. 

   Q: Does the ignition key reminder buzzer sound normally? 

   YES:  Go to Step 3.

   NO:  Carry out the troubleshooting for SWS. Refer to SYMPTOM CHART .

3. STEP 3. 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 SWS MONITOR ."
   2. Turn the ignition switch to the "ON" position.
   3. Diagnose the CAN bus line.
   4. Turn the ignition switch to the "LOCK" (OFF) position.

   Q: Is the CAN bus line found to be normal? 

   YES:  Go to Step 4.

   NO:  Repair the CAN bus line (Refer to DIAGNOSIS ).

   Fig 1: Connecting Scan Tool To Data Link Connector

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
4. STEP 4. Temporarily replace the multi-center display, and check that the multi-center display operation tone (beep sound) is output. 

   Q: When the multi-center display is temporarily replaced, does the multi-center display operation tone (beep sound) sound? 

   YES:  Replace the multi-center display. Check that the multi-center display operation tone (beep sound) is output.

   NO:  Return to Step  1.