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.
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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1003 (WIRING SYSTEMS AND POWER MANAGEMENT - SERVICE, TROUBLESHOOTING & DIAGNOSIS)RETAINED ACCESSORY POWER (RAP) MALFUNCTIONCIRCUIT/SYSTEM TESTING
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A
Circuit/System Testing
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect harness connector X2 of the right I/P junction block.
- Connect a test lamp between the accessory voltage circuit terminal B3 (component side) and ground.
- Command the scan tool Accy/RAP Relay ON and OFF. the test lamp should cycle on and off as appropriate.
- If the test lamp is always ON, test the accessory voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp is always OFF, test the accessory voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
- If equipped with a sunroof, connect a test lamp between the accessory voltage circuit terminal B3 (harness side) and ground. The test lamp should not illuminate.
- If the test lamp illuminates, test the accessory voltage circuit for a short to voltage.
- If all circuits test normal, replace the BCM.
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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.