Power Locks: Description and Operation

CIRCUIT OPERATION
Battery voltage is applied at all times to the automatic door lock control module through the door lock fuse. Battery voltage is also applied to the automatic door lock control module through the IG Fuse when the ignition switch is in the "ON" or "START" position. If the LH Front Door or the RH Front Door is unlocked, the LH door lock switch or the RH door lock switch is closed. If either switch is closed, a reference ground is provided to the AUTOMATIC DOOR LOCK control module. When this reference ground is provided, the automatic door lock control module will provide a ground for the "LOCK DOORS" Indicator. The "LOCK DOORS" Indicator informs the Driver that one or both of the Front Doors are unlocked.

The automatic door lock control module also receives an input from the Vehicle Speed Sensor (VSS). The VSS is permanently grounded at ground G202. When the vehicle speed exceeds 13 km/h (8 mph) and either the LH Front Door or the RH Front Door is unlocked, the automatic door lock control module will apply Battery voltage to the LH/RH DOOR LOCK ACTUATORS. The LH/RH door lock actuators will only lock the doors. The Front Doors will automatically lock once, with the vehicle speed above 13 km/h (8 mph). If the LH Front or RH Front Door is unlocked when the vehicle speed is above 13 km/h (8 mph), the automatic door lock control module will not re-lock the Front Door(s) until the vehicle is brought to a complete stop, and then accelerated above 13 km/h (8 mph).