Central Door Unlock

The central door unlock feature is activated when the driver door key is inserted into the driver door lock cylinder and turned to the Unlock position. The doors will unlock when either of the following happens:
^ The DDM sees that the key cylinder switch is continuously closed for longer than 3 seconds.
^ The DDM sees that the key cylinder switch is closed twice in 3 seconds.

The DDM sends a Class 2 message to the RIM indicating the above. The RIM sends a Class 2 message to the DDM to unlock all doors. The DDM sends a power door serial data message to the other door modules to unlock all doors.

The exterior key cylinder switch is wired to the Driver Door Module (DDM). The DDM supplies battery positive voltage through the driver door key switch signal circuit and ground via a ground circuit to the normally open contacts of the switch. When the switch is closed, voltage flows through the switch, providing the DDM with the necessary input.