Serial Data Control of Retained Accessory Power (RAP)

WARNING: This page is about a different car, the 2006 Pontiac Torrent and 2006 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Retained accessory power (RAP) is a vehicle power mode that permits the operation of selected customer convenience items after the ignition switch is turned OFF. These selected items will remain in operation until a passenger compartment door or liftgate is opened or until the RAP function timer reaches its shut-off limit.

The class 2 RAP power mode is mapped to GMLAN serial data circuit as Off Awake power mode. Refer to Data Link Communications Description and Operation for more information on data link communications. The BCM monitors the ignition switch signals, battery condition and the doors status to determine whether RAP should be initiated. The modules that support the RAP power mode will operate the systems under their control as required by their RAP power mode strategy.

RAP will end when one of the following conditions is met:

The BCM detects the opening of a passenger compartment door.
The RAP timer expires.
The battery capacity decreases below a prescribed limit.
Any other ignition switch state is chosen.

The function supported in the RAP power mode is the operation of the radio.