Inspection Procedure 4

Inspection Procedure 4: The navigation system can be operated while the vehicle is driven.

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














COMMENTS ON TROUBLE SYMPTOM

There is a failure in the wiring harness between the combination meter and the multivision display, the respective connector(s), the combination meter or the multivision display.

PROBABLE CAUSES

- The combination meter may be defective
- The multivision display may be defective
- 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: Vehicle Communication Interface (V.C.I.)
- MB991827 M.U.T.-III USB Cable
- MB991910 M.U.T.-III Main Harness A

STEP 1. Perform "Vehicle Signal Check" in the MMCS service mode.

Perform "Vehicle Signal Check" in the MMCS service mode to check whether vehicle speed signal is normal (Refer to Reading and Clearing Diagnostic Trouble Codes).

Q. Is the vehicle speed signal transmitted normally?

YES Replace the multivision display.
NO Go to Step 2.
STEP 2. Check the speedometer.

Check whether the speedometer works normally.

Q. Does the speedometer work normally?

YES Go to Step 3.
NO Diagnose the combination meter (Refer to Combination meter - Troubleshooting Symptom Chart).
STEP 3. Check combination meter connector C-04 and multivision display connector C-13 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q. Is combination meter connector C-04 and multivision display connector C-13 in good condition?

YES Go to Step 4.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 4. Check the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-13 (terminal 13).

- Check the communication lines for open circuit and short circuit.

NOTE:
Also check intermediate connector C-108 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-108 is damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.

Q. Is the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-13 (terminal 13) in good condition?

YES Go to Step 5.
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 5. Substitute a known good multivision display, and check the trouble symptom.

Check that no menus are active during driving.

Q. Is the check result normal?

YES Replace the multivision display.
NO Replace the combination meter.