INSPECTION PROCEDURE A-1: Keyless Entry System does not Work.

caution

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

COMMENTS ON TROUBLE SYMPTOM

If the keyless entry system does not work normally, the input signal circuits to the components below or the ETACS-ECU may be defective.

Key reminder switch
All of the door switches
Keyless entry transmitter
Driver’s door lock actuator

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. 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 2.

Refer to inspection procedure A-1 "Central door locking system does not work

<Not using SWS monitor> or

<Using SWS monitor>."

STEP 2. Check the power supply circuit.

When the ignition switch is turned to the LOCK (OFF) 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 ETACS-ECU battery power supply circuit

<Not using SWS monitor> or

<Using SWS monitor>."

STEP 3. Pulse check

Check the input signals below which are related to the keyless entry system.

System switch	Check condition
Key reminder switch	When the inserted ignition key is pulled out
Driver’s door switch	Driver’s door opened.
Passenger’s door switch	Passenger’s door opened.
Rear door (RH) switch	Rear door (RH) opened
Rear door (LH) switch	Rear door (LH) opened
Back door switch	A back door opened
Keyless entry transmitter switch	When the switch is turned from off to on

OK: The M.U.T.-III sounds or the voltmeter needle fluctuates.

Q. Are the check result normal?

YES <All the signals are received normally.>

: Go to Step 4.

NO <The key reminder switch signal is not received.> : Refer to GROUP 54A, inspection procedure C-11 "The key reminder switch signal is not received

."

NO <All the door switch signals are not received.> : Refer to GROUP 54A, inspection procedure C-14 "All the door switch signals are not received

<LH drive vehicles> or

<RH drive vehicles>."

NO <The keyless entry transmitter switch signal is not received.> : Refer to GROUP 54A, inspection procedure C-20 "Each switch signal of the keyless entry transmitter is not received

STEP 4. 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.