Inspection Procedure 4: The Navigation System can be Operated while the Vehicle is Driven.


caution Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.








COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunctions of combination meter
  • Malfunctions of audio visual navigation unit
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

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 ).

Q. Is the vehicle speed signal transmitted normally?
Replace the audio visual navigation unit.
Go to Step 2.

STEP 2. Check the speedometer.
Check whether the speedometer works normally.

Q. Does the speedometer work normally?
Go to Step 3.
Diagnose the combination meter (Refer to Combination meter - Troubleshooting ).

STEP 3. Connector check: C-03 combination meter connector, C-11 audio visual navigation unit connector

Q. Is the check result normal?
Go to Step 4.
Repair the defective connector.

STEP 4. Check the wire harness between C-03 combination meter connector terminal No.20 and C-11 audio visual navigation unit connector terminal No.13.

  • Check the communication lines for open circuit.
note Prior to the wiring harness inspection, check intermediate connector C-19, and repair if necessary.

Q. Is the check result normal?
Go to Step 5.
Repair the wiring harness.

STEP 5. Substitute a known good audio visual navigation unit, and check the trouble symptom.
Check that no menus are active during driving.

Q. Is the check result normal?
Replace the audio visual navigation unit.
Replace the combination meter.