Forgotten Key Prevention Function

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

If the driver's door is open (driver's door switch: ON), when the key is inserted in the ignition switch (key reminder switch: OFF), the ETACS-ECU activates the door unlock relay for 0.5 seconds to prevent the door from being locked.
If you try to lock either the driver's and passenger's door when the passenger's door is open (door switch turned ON) and the key is inserted in the ignition switch (key reminder switch turned OFF), the ETACS-ECU prevents the doors from being locked by activating the door unlock relay for 0.5 seconds.