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.
Pinpoint Tests: Notes
The PRB Does Not Operate Correctly - Both
Refer to Retractable Running Boards for schematic and connector information.
Normal Operation and Fault Conditions
The RBM receives battery voltage from BJB fuse F50 (30A) and ground at G303. The LH and RH Hall-effect sensors (Integral to the PRB motors) receive a regulated 10 volt power supply, and ground from the RBM. The RBM monitors each motor movement using the Hall-effect sensor signal from the respective motor. The RBM receives door ajar status for each door and vehicle speed status over the MS-CAN. Door ajar signals trigger the RBM to deploy or stow the respective RH or LHPRB.
Possible Causes
- Wiring, terminals or connectors
- Door ajar signal concern
- Vehicle speed signal concern
- Foreign material causing blockage of PRB movement
- PRB motor
- RBM
Visual Inspection and Diagnostic Pre-checks
- BJB fuse F50 (30A).
- Foreign material causing blockage of PRB movement
NO RELATED
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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.