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 MANUALSGMC2011SAVANA SPECIAL 4.8 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 175 (WIRING SYSTEMS AND POWER MANAGEMENT - DTC DIAGNOSTICS, TROUBLESHOOTING AND CONNECTOR REPAIR)DIAGNOSTIC INFORMATION AND PROCEDURESRETAINED ACCESSORY POWER MALFUNCTIONCIRCUIT/SYSTEM TESTING
2011 GMC Savana Special 4.8 A
Circuit/System Testing
2011 GMC Savana Special 4.8 ASECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 GMC Savana and 2011 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the RAP Relay.
- Test for less than 2 ohms of resistance between ground circuit terminal and ground.
- If greater than specified, test the ground circuit for an open/high resistance.
- Connect a test lamp between control circuit terminal and ground.
- With the driver and passenger doors open, cycle the ignition key ON and OFF. The test lamp should turn ON and OFF when cycling the ignition switch.
- If the test lamp remains ON at all times, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- If the test lamp remains OFF at all times, test the relay coil control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
- Connect a test lamp between the relay output voltage circuit terminal and ground. The test lamp should not illuminate.
- If the test lamp illuminates, test the relay output circuits for a short to voltage:
- If all circuits test normal, test or replace the RAP relay.
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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.