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 MANUALSBUICK2013REGAL TURBO PREMIUM, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 48 (MIRROR SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESAUTOMATIC DAY-NIGHT MIRRORS MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2013 Buick Regal Turbo Premium, Standard Trans
Circuit/System Verification
2013 Buick Regal Turbo Premium, Standard TransSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor while observing the inside rearview mirror face. The inside rearview mirror face should dim.
- Engine running, park brake applied, place the transmission in REVERSE. The inside rearview mirror face should transition from dim to bright.
- If the mirror does not transition between the bright and dim states, refer to Inside Rearview Mirror Dimming Malfunction .
- Vehicle in PARK, shine a flashlight at the rear light sensor while observing the driver outside rearview mirror face. The outside rearview mirror face should dim.
- Engine running, park brake applied, place the transmission in REVERSE. The driver outside rearview mirror face should transition from dim to bright.
- If the mirror does not transition between the bright and dim states, refer to Outside Rearview Mirror Dimming Malfunction .
RENDER: 1.0x
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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.