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 0.25 second every one second.

Fig 1: Forgotten Key Prevention Function Chart

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.