Introduction To Keyless Entry System Diagnosis

A signal is transmitted from the transmitter to the keyless entry receiver-ECU. If the signal corresponds with that stored in the keyless entry receiver-ECU, the ECU send a signal to the ETACS-ECU. Then the door lock/unlock control is operated. When doors are locked, the dome light, the cargo space light and hazard warning lights will flash twice when doors are unlock, the dome light, the cargo space light will come on and dim after 15 seconds, and the hazard warning lights flash once.

If the following type of symptom occurs, there may be a fault.

• All the doors cannot be locked or unlocked when the transmitter is operated.
• The secret code cannot de registered.
• The dome light, the cargo space light and the hazard warning lights do not operate through the answerback function.