Inspection Procedure 5: No door will be locked or unlocked by operating a lock/unlock switch on any door.

caution

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

PROBABLE CAUSES

Malfunction of the CAN bus lines
Malfunction of the central door locking system
Malfunction of the keyless operation key
Damaged wiring harness and connectors
Malfunction of the KOS-ECU
Function setting error or no setting with a customisation

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting

STEP 2. M.U.T.-III diagnosis code

Check if any diagnosis code is set to the KOS-ECU.

Q. Is the diagnosis code set?

Refer to diagnosis code chart

Go to Step 3.

STEP 3. Check the central door locking system operation

Check that the central door locking system works normally.

Q. Is the check result normal?

Go to Step 4.

Perform troubleshooting for the central door locking system (Refer to GROUP 42A - Troubleshooting

STEP 4. Check the customisation

Check that "KOS feature" is set to "Both enable" with a customisation function.

Q. Is it set to "Both enable"?

Go to Step 5.

Set "KOS feature" to "Both enable" with a customisation function (Refer to

STEP 5. Check with another registered keyless operation key.

Q. Can the engine switch be turned ON? (Is the keyless operation key recognised?)

Replace the keyless operation key that could not turn the engine switch ON (the keyless operation key was not recognised), and register the ID codes (refer to

Go to Step 6.

STEP 6. Check of the troubles

Operate the lock/unlock switch to check that the door can be locked and unlocked.

Q. Is the check result normal?

The diagnosis is complete.

Replace KOS-ECU and register the ID codes (Refer to