Keyless Entry: Description and Operation

KEYLESS ENTRY SYSTEM


Some models are equipped with a radio-controlled keyless entry system. The main features are:
- Antenna and receiver are incorporated in the ETACS-ECU.
- ID code can be registered by using the scan tool MB991958 (MUT-III sub assembly).
- Transmitter is a key holder type, which incorporates lock button and unlock button.
- The locking is answered back by two times' flashing of the doom light, two times' flashing of the turn signal lights and one time sounding of the horn answerback.
- The unlocking is answered back by illuminating of the doom light for 15 seconds and one time flashing of the turn signal lights.




GENERAL DESCRIPTION CONCERNING THE KEYLESS ENTRY SYSTEM
The following ECUs affect the functions and control of the keyless entry system.

ALL DOOR LOCK FUNCTION




OPERATING THE TRANSMITTER LOCK SWITCH
When the transmitter lock switch is pressed, the ETACS-ECU energizes its door lock relay to operate all the door lock actuators for 0.25 second thus causing all doors to be locked.

DRIVER'S DOOR UNLOCK FUNCTION




OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS ONCE
When the transmitter unlock switch is pressed once, the ETACS-ECU energizes its door unlock relay to operate the door lock actuator of the driver's door for 0.25 seconds thus causing only the driver's door to be unlocked.

ALL DOOR UNLOCK FUNCTION




OPERATING THE TRANSMITTER UNLOCK SWITCH PRESS TWICE
When the transmitter unlock switch is pressed twice, the ETACS-ECU energizes its door unlock relay to operate the driver's door lock actuator and the other door lock actuators for 0.25 seconds each in succession. Then, the doors will be unlocked.




KEYLESS ENTRY HAZARD ANSWERBACK AND HORN ANSWERBACK FUNCTION
The hazard answerback and horn answerback function which facilities checking of lock or unlock operations even during day-time is provided. When the lock signal is input from the keyless entry transmitter to the ETACS-ECU, the hazard light flashes twice and horn sounds once. When the unlock signal is input, hazard light flashes once.

NOTE: Hazard answerback function can be disabled by the configuration function.