Inspection Procedure 3: Keyless Operation warning display does not disappear.

caution

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

PROBABLE CAUSES

Malfunction of CAN bus line
Malfunction of combination meter
Damaged wiring harness and connectors
Malfunction of the KOS-ECU

DIAGNOSTIC 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

). On completion, go to Step 2.

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

Check whether a combination meter-related diagnosis code is set.

Q. Is the diagnosis code set?

Perform troubleshooting for the combination meter (Refer to GROUP 54A - Combination Meter - Troubleshooting

Go to Step 3.

STEP 3. M.U.T.-III diagnosis code

Check whether a KOS-related diagnosis code is set.

Q. Is the diagnosis code set?

Refer to

Go to Step 4.

STEP 4. Check of the troubles

Check that the keyless operation warning lamp turns OFF unless the flashing or illumination conditions are met.

Q. Is the diagnosis code set?

Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction

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