Inspection Procedure 5

Inspection Procedure 5: The Screen is not Normal in the Navigation Mode.

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 GPS antenna, the respective connector(s), the combination meter or the multivision display.

PROBABLE CAUSES

- Malfunctions of GPS antenna

- Malfunctions of combination meter

- Malfunctions of multivision display

- Damaged harness wires and connectors

DIAGNOSIS

Required Special Tools:

- MB991223: Harness Set

- MB992006: Extra Fine Probe

STEP 1. Confirmation in MMCS service mode

Check the items below in the MMCS service mode. (Refer to Without Manufacture's Scan Tool (Service Mode).)

- Perform "Network/Connect Line Check" in the MMCS service mode to check that the communication and wire connection with the GPS are in good condition.

- Perform "Vehicle Signal Check", and then check the status of the vehicle speed signal.

- Perform "Sensor Check", and then check the status of the vehicle speed sensor and the gyro sensor.

Q. Is the check result normal?

YES (OK for all) : Go to Step 7.
NO [GPS is not OK] : Go to Step 2.
NO [The vehicle speed sensor is not OK, or vehicle speed pulse does not increase after starting from a standstill] : Go to Step 4.
NO [Gyro sensor is not OK] : Go to Step 7.
STEP 2. Check the fit of the GPS antenna cable.

Check whether the GPS antenna cable is connected properly.

Q. Is the GPS antenna cable connected properly?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Go to Step 3.
STEP 3. Substitute a known good GPS antenna, and then check whether it works normally.

Q. Is the check result normal?

YES Replace the GPS antenna.
NO Go to Step 7.
STEP 4. Check the speed meter.

Check whether the speed meter works normally.

Q. Does the speedometer work normally?

YES Go to Step 5.
NO Diagnose the combination meter (Refer to Combination meter - Diagnosis Symptom Chart).
STEP 5. Check combination meter connector C-04 and multivision display connector C-14 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-14 in good condition?

YES Go to Step 6.
NO Repair or replace the damaged component Harness Connector Inspection).
STEP 6. Check the wiring harness between combination meter connector C-04 (terminal 20) and multivision display connector C-14 (terminal 13).

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

NOTE:
Also check intermediate connector C-105 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-105 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-14 (terminal 13) 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.
STEP 7. Substitute a known good multivision display, and check the trouble symptom.

Check whether the navigation screen is normal.

Q. Is the navigation screen normal?

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