GM Service Manual Online
For 1990-2009 cars only

The retained accessory power (RAP) feature allows you to operate the following components after the ignition switch is turned from the RUN position to the LOCK or the OFF position:

    • The power windows
    • The driver information center (If Equipped)
    • The radio

These circuits are powered through the RAP relay terminal 30 in relay block 2. The RAP relay terminal 85 and terminal 87 are powered at all times from the RAP fuse in the underhood fuse block through CKT 742 (RED). The ground is controlled by the body control module (BCM) through CKT 755 (BLK). Power is also supplied to terminal 87A of the RAP relay from the ignition switch. With the ignition switch in the ACC or RUN position, the RAP relay is powered through CKT 3 (BRN). With the RAP relay de-energized, power is supplied to the accessories from the ignition switch. The RAP relay is energized when a ground is provided by the BCM. The BCM will energize the RAP relay when the ignition switch is turned to the OFF position and all of the doors are closed. This closes the contacts at terminal 87 and terminal 30 of the RAP relay in order to power the accessories. The accessories will remain operational until the ground is removed from the relay. The BCM will remove the ground when one of the following conditions occur:

    • A 20 minute timer has elapsed.
    • The driver/passenger door is opened.
    • The ignition switch is activated.
    • The liftgate jamb switch is activated.