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 150 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESHEADLAMPS 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 2012 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, observe the scan tool Headlamps On Switch parameter while turning the headlamp switch ON and OFF. The reading should toggle between Active and Inactive.
- If the reading does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
- Observe the scan tool Automatic Headlamps Disable Switch parameter while applying and releasing the automatic lamp control disable switch. The reading should toggle between Active and Inactive.
- If the reading does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
- Observe the scan tool Headlamps Flash Switch parameter while applying and releasing the flash to pass switch. The reading should toggle between Active and Inactive.
- If the reading does not change between the commanded states, refer to Turn Signal/Multifunction Switch Malfunction in Circuit/System Testing .
- Observe the scan tool High Beam Select Switch parameter while applying and releasing the high beam select switch. The reading should toggle between Active and Inactive.
- If the reading does not change between the commanded states, refer to Turn Signal/Multifunction Switch Malfunction in Circuit/System Testing .
- Command the Headlamp Low Beam Command ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.
- If the low beam headlamps do not turn ON and OFF when changing between the commanded states, refer to Headlamps Malfunction - Low Beam in Circuit/System Testing .
- Turn the high beam headlamps ON and OFF with the turn signal/multifunction switch. The high beam headlamps should turn ON and OFF when changing between the selected states.
- If the high beam headlamps do not turn ON and OFF when changing between the selected states, refer to Headlamps Malfunction - High Beam in Circuit/System Testing .
- Command the All Indicators Test ON and OFF with a scan tool. The high beam indicator should turn ON and OFF when changing between the commanded states.
- If the high beam indicator illuminates during the test, replace the K9 BCM.
- If the high beam indicator does not illuminate during the test or remains illuminated at all times, replace the P16 instrument cluster.
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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.