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 172 (MIRROR SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MIRROR 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 harness connector at the power mirror switch.
- Test for less than 10 Ξ© between the ground circuit terminal D and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal E and ground.
- If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuits for a short to ground.
- Connect the harness connector at the outside rearview mirror switch.
- Disconnect the harness connector at the appropriate power mirror.
- Connect a test lamp between the control circuit terminal F and the control circuit terminal E.
- Operate the vertical switch UP and DOWN. The test lamp should turn ON when commanding the UP and DOWN states.
- If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground or an open/high resistance on the control circuits. If the circuits test normal, replace the power mirror switch.
- Connect a test lamp between the control circuit terminal G and the control circuit terminal H.
- Operate the horizontal switch LEFT and RIGHT. The test lamp should turn ON when commanding the LEFT and RIGHT states.
- If the test lamp remains OFF during either of the commands, test for a short to voltage, short to ground or an open/high resistance on the control circuits. If the circuits test normal, replace the power mirror switch.
- If all circuits test normal, test or replace the power mirror.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.