Inspection Procedure E-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

POSSIBLE 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 C-1 "Central door locking system does not work ."

Step 2. Check the power supply circuit.
When the ignition switch is turned to the LOCK (OFF) position, check if the hazard warning lamps illuminate.

Q. Is the check result normal?
Go to Step 3.
Refer to Inspection Procedure A-2 "When the ignition switch is at the LOCK (OFF) position, the functions do not work normally. Check the battery power supply circuit to the ETACS-ECU ."

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
Tailgate switch
 A tailgate 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?
All the signals are received normally. : Go to Step 4.
The key reminder switch signal is not received. : Refer to Inspection Procedure P-10 "The key reminder switch signal is not received ."
Driver’s door switch signals are not received. : Refer to Inspection Procedure P-4 "The driver’s door switch signal is not received ."
Passenger’s door, rear doors switch or tailgate switch signals are not received. : Refer to Inspection Procedure P-12 "All the door switch signals are not received ."
Tailgate switch signals are not received. : Refer to Inspection Procedure P-12 "All the door switch signals are not received ."
The keyless entry transmitter switch signal is not received. : Refer to Inspection Procedure P-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 Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.