Inspection Procedure 1: Keyless entry system does not work.


caution Whenever the ECU is replaced, ensure that the input and output signal circuits are normal.

OPERATION


The lock/unlock signals from the transmitter are received by receiver antenna, and then sent to ETACS-ECU from receiver antenna. When ETACS-ECU receives signals from the key reminder switch, all the door switches and the tailgate latch, ETACS-ECU actuates the keyless entry system.

PROBABLE CAUSES



DIAGNOSTIC 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 that ETACS-ECU sets a diagnosis code.

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 - Malfunction of 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 for the signals related to the keyless entry system operation.

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
Item 264
 Handle lock switch
 Key in → Key out
OK: Normal conditions are displayed for all the items.

Q. Is 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: The tailgate latch switch signal is not received .

Normal condition is not displayed for item No. 264. : Refer to GROUP 54A - Inspection Procedure 3: "Key reminder switch signal is not received ."

STEP 7. Check of short to power supply, short to earth, open circuit in SIGR, PWRC line between ETACS-ECU connector and receiver antenna connector.


Q. Is the check result normal?

YES : Go to Step 8.

Repair the connector(s) wiring harness.

STEP 8. Retest the system.


Check if the keyless entry system works normally.

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).

Replace receiver antenna (Refer to GROUP 54A - Receiver antenna ) and turn ignition switch to ON and OFF. Then go to step 9.

STEP 9. Retest the system.


Check if the keyless entry system works normally.

Q. Is the check result normal?

The diagnosis is complete.

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