Inspection Procedure 4: 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



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 ). On completion, go to Step 2.

STEP 2. M.U.T.-III other system diagnosis code
Check if any diagnosis code is set to the combination meter.

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

Q. Is the diagnosis code set?
Refer to .
Go to Step 4.

STEP 4. Retest the system
Check that the keyless operation warning lamp turns OFF unless the flashing or illumination conditions are met.

Q. Is the check result normal?
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace KOS-ECU and register the ID codes (Refer to ).