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 VERIFICATION
2011 GMC Savana Special 4.8 A
Circuit/System Verification
2011 GMC Savana Special 4.8 ASECTION Circuit/System Verification
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.
IMPORTANT:
Battery voltage must remain above 9.6 V for RAP to operate properly.
Radio RAP
- With all passenger doors closed, observe the courtesy lamps while opening and closing the driver door. The courtesy lamps should illuminate when the door is opened and turn off approximately 30 seconds after closing the door.
- If the courtesy lamp operation is incorrect from the drivers door, refer to Courtesy Lamps Malfunction .
- If courtesy lamp operation is correct, and the radio is the only RAP concern, replace the radio.
Relay RAP
- Ignition ON, observe each scan tool Door Open Sw. parameter while opening and closing each vehicle door. The reading should change appropriately indicating the door is open or closed.
- If any parameter does not change as specified, refer to Courtesy Lamps Malfunction .
- Command the scan tool Accy/RAP Relay OFF. Attempt to operate any RAP relay controlled component within 5 seconds. The component should not operate.
- Command the scan tool Accy/RAP Relay ON. Attempt to operate any RAP relay controlled component within 5 seconds. The component should operate.
- Ignition ON, all doors closed. Observe the scan tool parameter Accy/RAP Relay Command. Ignition OFF, key removed, the reading should be ON for approximately 10 minutes then change to OFF.
- If the parameter does not respond as specified, 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.