Inspection Procedure 1

INSPECTION PROCEDURE 1: Communication between scan tool and multi-center display is not possible.

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.)

COMMENTS ON TROUBLE SYMPTOM
If the communication with scan tool cannot be made, the CAN circuit or power supply circuit may be faulty.

TROUBLESHOOTING HINTS
The CAN bus line may be defective

DIAGNOSIS

Required Special Tools:
- 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

STEP 1. Perform "SIGNAL CHECK" in the service mode.

1. Display the SIGNAL CHECK screen. Without Scan Tool
2. Turn the ignition switch to the "ON" position.
3. Check if "ON" is shown in the field of Key position.

Q: Is the check result normal?

YES : Go to Step 2.

NO : Refer to INSPECTION PROCEDURE 6, Inspection Procedure 6 and then go to Step 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 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 : Replace the multi-center display.

NO : Repair the CAN bus line.