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 ETACS-ECU. When ETACS-ECU receives signals from the key reminder switch and all the door switches, ETACS-ECU actuates the keyless entry system.

PROBABLE CAUSES

Malfunction of the key reminder switch
Malfunction of the door switches
Malfunction of the tailgate switch
Malfunction of the transmitter
Malfunction of the driver’s door lock actuator
Malfunction of the ETACS-ECU
Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code

Check that ETACS-ECU sets a diagnosis code.

Q. Is the diagnosis code set?

Refer to GROUP 54A, Diagnosis code chart

Go to Step 2.

STEP 2. Check the power supply circuit.

When the ignition switch is turned to the LOCK position, check if the hazard warning lamp illuminate.

Q. Is the check result normal?

Go to Step 3.

Refer to GROUP 54A, Inspection Procedure A-1 "Check the battery power supply circuit to the ETACS-ECU

STEP 3. 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 4.

Refer to Trouble symptom chart

STEP 4. M.U.T.-III data list

Check for the signals related to the keyless entry system operation.

Turn the ignition switch to the LOCK position.
Remove the ignition key from the ignition key cylinder.
Close the driver’s door.
Close the front passenger’s doors.
Close the RH-side rear door.
Close the LH-side rear door.
Close the tailgate.

Item No.	Item name	Normal condition
19	Driver’s door switch	OFF
20	Driver’s door unlock switch	ON→OFF
21	Driver’s door lock switch	OFF→ON
28	Steering lock switch	OFF
48	Passenger’s door switch	OFF
49	Rear door switch	OFF

OK: Normal conditions are displayed for all the items.

Q. Are the check result normal?

YES (Normal conditions are displayed for all the items.)

: Go to Step 5.

NO (Normal condition is not displayed for item No. 19.) : Refer to GROUP 54A, Inspection Procedure 5 "The front door switch (driver’s side) signal is not received

."

NO (Normal condition is not displayed for item No. 20, 21.) : Refer to GROUP 54A, Inspection Procedure 4 "The front door lock actuator (driver’s side) signal is not received

."

NO (Normal condition is not displayed for item No. 28.) : Refer to GROUP 54A - Inspection Procedure 3: "The key reminder switch signal is not received

."

NO (Normal condition is not displayed for item No. 48.) : Refer to GROUP 54A, Inspection Procedure 6 "The front door switch (passenger’s side) signal is not received.

."

NO (Normal condition is not displayed for item No. 49.) : Refer to GROUP 54A, Inspection Procedure 7 "One of the door switch signals (including the tailgate latch switch) is not received

STEP 5. Retest the system.

Check the keyless entry system works normally.

Q. Is the check result normal?

The trouble can be an intermittent malfunction (Refer to GROUP 00, How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction

Replace the ETACS-ECU.