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