Accessory Delay Module: Description and Operation

RETAINED ACCESSORY POWER (RAP) POWER MODE
RAP is a vehicle power mode that permits the operation of selected customer convenience items after the ignition switch is turned OFF. These selected items will remain in operation until a passenger compartment door is opened or until the RAP function timer reaches its shut-off limit.

The BCM turns OFF the RAP function and de-energizes the RAP#1 relay when one of the following conditions are met:
- The BCM senses the opening of any door or the liftgate.
- The BCM detects a decrease in battery capacity below a prescribed limit.
- The BCM receives a message from its internal timer indicating the end of the RAP period after 20 minutes.
- The transition from OFF to RUN/ON of the ignition switch.

RAP RELAY #1
The body control module monitors the ignition switch position, battery condition and passenger compartment door status to determine whether RAP should be initiated. If the ignition switch transitions from RUN/ON to OFF, the battery level is within the acceptable range and the passenger compartment doors are closed, the body control module energizes the RAP#1 relay. This provides power for the following:
- RAP Relay #2 Control Signal
- DIC
- Rear Seat Audio Controller
- Left and Right Steering Wheel Control Switches.
- Left Front and Rear Power Window Control Switches
- Left Front and Rear Power door lock Switches
- Radio
- OnStar, VIU

RAP RELAY #2
When the BCM commands the RAP function active, RAP#1 relay supplies a signal to RAP#2 relay's control circuit. RAP#2 relay then supplies an isolated fused power source to the following accessories:
- Right Front and Rear Power Window Control Switches
- Right Front and Rear Power door lock Switches
- Power Sunroof