Inspection Procedure 4

INSPECTION PROCEDURE 4: The multi-center display operation tone (beep sound) does not sound.

CAUTION: Before replacing the multi-center display, ensure that the power supply circuit and the ground circuit are normal. (Check that the voltage is 10 V or more.)

TROUBLESHOOTING HINTS
- The multi-center display may be defective

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

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.

STEP 2. Check that the ignition key reminder tone alarm sounds normally.

Q: Does the ignition key reminder tone alarm sound normally?

YES : Go to Step 3.

NO : Carry out the troubleshooting for SWS. Refer to Troubleshooting. Symptom Related Diagnostic Procedures

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." 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.

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.