Accessory Delay Module: Description and Operation

RETAINED ACCESSORY POWER (RAP) POWER MODE
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 body control module monitors the ignition switch position, battery condition and passenger compartment door status to determine whether RAP should be initiated. If the ignition switch transitions from RUN/ON to OFF, the battery level is within the acceptable range and the passenger compartment doors are closed, the body control module closes the RAP relay.

This provides power for the following:
^ Sunroof
^ Power windows
^ Power door locks
^ Radio
^ Rear radio
^ OnStar

The BCM turns OFF the RAP function and opens the RAP relay when one of the following conditions are met:
^ The BCM senses the opening of any door or the liftgate.
^ The BCM detects a decrease in battery capacity below a prescribed limit.
^ The BCM receives a message from its internal timer indicating the end of the RAP period after 20 minutes.
^ The transition from OFF to RUN/ON or ACC of the ignition switch.