Retained Accessory Power

Retained Accessory Power Description and Operation

Serial Data Control of Retained Accessory Power (RAP)

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 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 power mode. Refer to Data Link Communications Description and Operation Description and Operation for more information on data link communications. The body control module (BCM) monitors the ignition mode signal from the ignition mode switch, 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 functions supported in the RAP power mode are:

* The power windows

* The instrument panel cluster (IPC) and driver information center (DIC) displays

* The entertainment devices