Retained Accessory Power

Retained Accessory Power Description and Operation

Retained Accessory Power (RAP)

The retained accessory power (RAP) system allows specific vehicle functions to operate for a specific amount of time after the ignition switch is turned OFF. The BCM monitors the ignition switch position, battery condition, and each door ajar switch status to determine whether RAP should be initiated or terminated. RAP is controlled with 2 different methods; serial data and relay control. Some modules receive a RAP message from the body control module (BCM) over the serial data circuits. Serial data controlled RAP is deactivated as required by their modules RAP power mode operation. Other subsystems are activated directly by the BCM through a RAP relay. Components and systems that are active in RAP are also activated anytime the ignition is any position other than OFF regardless of the door switch signals. The RAP relay is located in the I/P fuse block, is grounded at G302, and is controlled by the rap relay coil control circuit from the BCM.

Relay Controlled RAP

The BCM keeps the RAP relay energized during all power modes, except Off-Awake and Crank. The relay is also energized for approximately 10 minutes after shutting the ignition OFF and removing the key, providing no door is opened.

Relay controlled RAP will end when one of the following conditions is met:

* The BCM receives an input from any door open switch indicating the opening of any door after the ignition key is out of the ignition.
Note: If the BCM is receiving any door open signal from those switches when the ignition key is turned OFF, RAP will not initiate.

* The BCM internal timer for the RAP expires after approximately 10 minutes.
* The BCM detects a decrease in battery capacity below a prescribed limit.

Systems powered by the accessory relay during the retained accessory power (RAP) power mode are as follows:

* A/T shift lock control solenoid assembly (w/ floor shifter)
* Sunroof control module
* Inside rearview mirror
* Outside moisture sensor (CE1)

Serial Data Controlled RAP

RAP systems controlled by serial data are as follows:

Windows

Window RAP activation/termination timing is the same as relay operation. The front window switches are separate modules that operate the windows on their respective side of the vehicle.

Radio

Radio RAP activation/termination is the same as relay operation with 1 exception; the only door switch that will turn off the radio during RAP is the driver door open switch.

Vehicle Communication Interface Module (VCIM) (Onstar(R))

VCIM RAP activation/termination is the same as radio operation with 1 exception; if there is an active call when the ignition key is turned off the VCIM will remain in RAP mode, and keep the radio in RAP mode until the call is terminated.