Retained accessory power (RAP) is a vehicle power mode that permits the operation of the radio after the ignition switch is turned OFF. The radio will remain in operation until the drivers door is opened or until the RAP function timer reaches its shut-off limit.

The radio receives a power mode message from the body control module (BCM) over the serial data circuits. The BCM monitors the ignition switch position, battery condition and passenger compartment door status to determine whether RAP should be initiated. The BCM then sends a message to the radio telling it that it is in the RAP power mode.

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

The BCM then sends a serial data message to the radio ending the RAP function.