Power Locks: Description and Operation
CENTRAL DOOR LOCKING SYSTEMGENERAL DESCRIPTION CONCERNING CENTRAL DOOR LOCKING SYSTEM
The following ECUs affect the functions and control of the central door locking system.
DOOR LOCK FUNCTION
OPERATING THE DRIVER'S OR PASSENGER'S DOOR LOCK KEY CYLINDER
When the driver's or passenger's door is locked, the ETACS-ECU activates the lock relay output for 0.25 seconds and locks all doors.
OPERATING THE DRIVER'S OR PASSENGER'S DOOR LOCK SWITCH
When the door is locked by driver's or passenger's door lock switch, the ETACS-ECU activates the lock relay output for 0.25 seconds and locks all doors.
OPERATING THE DRIVER'S DOOR INSIDE LOCK KNOB
When the door is locked by driver's door inside lock knob, the ETACS-ECU activates the lock relay output for 0.25 seconds and locks all doors.
DOOR UNLOCK FUNCTION
OPERATING THE DRIVER'S DOOR LOCK KEY CYLINDER
If the driver's door unlocked when the driver's door is locked, the ETACS-ECU unlocks the driver's door only.
If the driver's door is unlocked (after the lock switch in the driver's door lock actuator is turned OFF, the unlock switch is turned ON) when the driver's door is unlocking, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks all doors.
OPERATING THE PASSENGER'S DOOR LOCK KEY CYLINDER
When the front passenger's door is unlocked (after the lock switch in the front passenger's unlock actuator is turned OFF, the unlock switch is turned ON,) the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks all doors.
OPERATING THE DRIVER'S OR PASSENGER'S DOOR LOCK SWITCH
When the door is unlocked by driver's or passenger's door lock switch, the ETACS-ECU activates the unlock relay output for 0.25 seconds and unlocks all doors.
FORGOTTEN KEY PREVENTION FUNCTION
If the driver's door is opened with the ignition key inserted in the ignition key cylinder and then locked (i.e., the unlock switch integrated in the driver's door lock actuator is off, and the lock switch is on), the ETACS-ECU turns on the unlock relay for 0.25 second after approximately 0.3 second. This prevents the door from being locked unintentionally. If the system fails to unlock the door, the ETACS-ECU try to turn on the unlock relay five times in maximum for 2.25 second every one second.
NOTE: The dotted line indicates that the system is trying to turn on the unlock relay if the door can not be unlocked.