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



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

DIAGNOSIS PROCEDURE


STEP 1. Confirmation in MMCS service mode


Check the items below in the MMCS service mode (Refer to ).

  • 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?

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
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?

Replace the GPS antenna.
Go to Step 7.

STEP 4. Check the speedometer.


Check whether the speedometer works normally.

Q. Does the speedometer work normally?

Go to Step 5.
Diagnose the combination meter (Refer to Combination meter - Troubleshooting ).

STEP 5. Connector check: C-03 combination meter connector, C-11 audio visual navigation unit connector


Q. Is the check result normal?

Go to Step 6.
Repair the defective connector.

STEP 6. Check the harness wire 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 7.
Repair the wiring harness.

STEP 7. Substitute a known good audio visual navigation unit, and check the trouble symptom.


Check whether the navigation screen is normal.

Q. Is the navigation screen normal?

Replace the audio visual navigation unit.
Replace the combinaiton meter.