Accessory Delay Module: Description and Operation

The Body Control Module (BCM) controls the Retained Accessory Power (RAP) feature. This feature allows the operation of the radio, power windows, power mirrors, and power sunroof (if equipped) for 10 minutes (or until a vehicle door opens) after the ignition switch has been turned from the RUN to the OFF/UNLOCK position.

The BCM interfaces with the vehicle's power distribution through the RAP relay. The RAP relay allows the BCM to control the application of power to circuit 75, which in turn provides power to these circuits:
^ Circuit 43 - Radio.
^ Circuit 143 - Power windows.
^ Circuit 343 - Power sunroof, power mirrors.
^ Circuit 843 - Steering wheel radio controls.

When the ignition switch is in either the ACC or the RUN position, the BCM energizes the RAP relay by grounding circuit 707.

The BCM turns off the RAP relay when the ignition switch is in the START position, thus disabling the RAP feature during engine crank and bulb test.

When the ignition switch is turned from the RUN to the OFF/UNLOCK position with all vehicle doors closed, the BCM leaves the RAP relay energized for 10 minutes(**), or until one or more of the following conditions are met:
^ Any vehicle door opens (the BCM detects a ground signal in circuit 49 or 159).
^ The content theft deterrent system goes into armed mode (if equipped with Content Theft Deterrent System - RPO UA6).

(**) The BCM has inadvertent load (battery rundown) protection, which is mileage-sensitive. Vehicles with less than 15 total driven miles have a 3 minute (+/- 18 seconds) time-out instead of ten minutes of RAP.

The BCM resets the RAP timer when the ignition switch is turned from the OFF/UNLOCK position to the ACC position.