Inspection Procedure 11: 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 lock/unlock signal of the keyless operation key is sent to ETACS-ECU via KOS-ECU. Also, when ETACS receives signals from the all the door switches, ETACS-ECU judges them to activate the keyless entry function.

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 ).
(2)Check if the "Keyless function" is "Enabled."

Q. Is the check result normal?

Go to Step 2.

Operate the M.U.T.-III to set the option coding "keyless" 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 to the KOS-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 ignition switch in the LOCK (OFF) position, check if the following function operates normally:

Q. Is the check result normal?

Go to Step 5.

Refer to GROUP 54A - Abnormality in ETACS-ECU Power Supply Circuit .

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 data list


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

Item No.
 Item name
 Normal condition
Item 256
 Dr door ajar switch
 Close
Item 257
 As door ajar switch
 Close
Item 258
 RR door ajar switch
 Close
Item 259
 RL door ajar switch
 Close
Item 260
 Trunk/gate trunk ajar switch
 Close
OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?

Normal conditions are displayed for all the items. : Go to Step 7.

Normal condition is not displayed for item No. 256. : Refer to GROUP 54A - Inspection Procedure 5: "Front door switch (driver’s side) signal is not received ."

Normal condition is not displayed for item No. 257. : Refer to GROUP 54A - Inspection Procedure 6: "Front door switch (passenger’s side) signal is not received ."

Normal condition is not displayed for item No. 258. : Refer to GROUP 54A - Inspection Procedure 7: "Rear door switch (RH) signal is not received ."

Normal condition is not displayed for item No. 259. : Refer to GROUP 54A - Inspection Procedure 8: Rear door switch (LH) signal is not received .

Normal condition is not displayed for item No. 260. : Refer to GROUP 54A - Inspection Procedure 9: "Tailgate latch signal is not received ."

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