GM Service Manual Online
For 1990-2009 cars only

The retained accessory power (RAP) system allows the following components to operate for approximately 10 minutes after the ignition switch is turned off:

    • The radio
    • The power windows
    • The sunroof (if equipped)
    • The cellular telephone (if equipped)

When the ignition switch is turned to the ACCY or the RUN position, voltage is applied from the IP junction block WSW/RFA fuse to the remote function actuator (RFA) module. When the RFA module grounds terminal 86 of the RAP relay, the RAP relay energizes and supplies power to the RDO/PH fuse and the SUNRF fuse (if equipped).

When the ignition switch is turned to the OFF position, the voltage from the IP junction block WSW/RFA fuse to the RFA module is removed. The RFA module continues to ground terminal 86 of the RAP relay for 10 minutes or until any passenger compartment door is opened. The RFA module receives the passenger compartment door status from the driver door module (DDM) through the class 2 serial data line. When either event occurs, power is removed from the rear junction block RDO/PH fuse and the rear junction block SUNRF fuse (if equipped).