Inspection Procedure 8: Keyless entry function does not work.


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

OPERATION


The ETACS-ECU operates the keyless entry function according to the signals of all door switches and the lock/unlock signal of the keyless operation key which is sent through the KOS&OSS-ECU.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. ETACS-ECU coding data check


(1)Use M.U.T.-III to read out the option coding information in ETACS-ECU (Refer to GROUP 00 - Precautions before Service - Coding Reference Table <Vehicles for GENERAL EXPORT>, <Vehicles for THAILAND>).
(2)Check if the Keyless entry is Enabled.

Q. Is the check result normal?

Go to Step 2.

Operate the M.U.T.-III to set the option coding keyless entry to enabled, and check the trouble symptom.

STEP 2. M.U.T.-III CAN bus diagnostics


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

Q. Is the CAN bus normal?

Go to Step 3.

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

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


Check if any diagnosis code is set in the KOS&OSS-ECU.

Q. Is the diagnosis code set?

Refer to diagnosis code chart .

Go to Step 4.

STEP 4. Check the power supply system


With the engine switch in the "LOCK" (OFF) position, check if the following function operates normally:

Q. Is the check result normal?

Go to Step 5.

Check ETACS-ECU Power Supply Circuit (Refer to GROUP 54A - ETACS ).

STEP 5. Check the operation of the central door locking system.


Check that the central door locking system works normally.

Q. Is the check result normal?

Go to Step 6.

Refer to GROUP 42A - Troubleshooting .

STEP 6. M.U.T.-III other system data list


Check the ETACS-ECU service data relevant to the operation of keyless entry function.

1.Open the driver’s door or front passenger’s door.
Item No.
 Item name
 Normal condition
19
 Driver’s door switch
 ON
48
 Passenger’s door switch
 ON
2.Open the rear door (RH) after the all doors close.
Item No.
 Item name
 Normal condition
49
 Rear door switch
 ON
3.Open the rear door (LH) after the all doors close.
Item No.
 Item name
 Normal condition
49
 Rear door switch
 ON
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?

Go to Step 7.

Perform troubleshooting for the ETACS-ECU (Refer to GROUP 54A - ETACS, Troubleshooting ).

STEP 7. Check with another registered keyless operation key.


Check that the keyless entry function can be used with another keyless operation key.

Q. Can the keyless entry function be used?

Replace the keyless operation key concerned and register the ID codes (Refer to ).

Go to Step 8.

STEP 8. Check of the troubles


Replace ETACS-ECU. After the replacement, perform the coding, and check that the keyless entry function operates normally.

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&OSS-ECU and register the ID codes (Refer to ).