Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Serial Data Control of Retained Accessory Power, RAP
The Radio receives a RAP message from the Body Control Module, BCM over the serial data circuits. The BCM module monitors the ignition switch position, battery condition and passenger compartment door status to determine whether RAP should be initiated. The BCM module then sends a message to the Radio telling it that it is in RAP power mode.
RAP will end when one of the following conditions are met:
- The BCM module receives an input from the drivers door jam switch.
- The BCM module receives a message from its internal timer indicating the end of the RAP period after 10 minutes.
- The BCM module detects a decrease in battery capacity below a prescribed limit.
- The transition from OFF to RUN/ON or ACC of the ignition switch.
The BCM module then sends a serial data message to the Radio ending the RAP function.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.