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 PROCEDURESDTC B3650COMPONENT TESTING
2013 Buick Regal Turbo Premium, Standard Trans
Component Testing
2013 Buick Regal Turbo Premium, Standard TransSECTION Component Testing
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.
Turn Signal/Multifunction Switch Test
- Ignition OFF, disconnect the harness connector at the S78 turn signal/multifunction switch.
- Test for Infinite resistance between the terminals listed below with the switch in the open position.
- Signal terminal 2 and ground terminal 3
- Signal terminal 4 and ground terminal 3
- If not the specified value, replace the S78 turn signal/multifunction switch.
- Test for less than 2 Ξ© between the signal terminal 2 and the ground terminal 3 with the switch in the high beam position.
- If greater than the specified value, replace the S78 turn signal/multifunction switch.
- Test for less than 2 Ξ© between the signal terminal 4 and the ground terminal 3 while holding the switch in the flash to pass position.
- If greater than the specified value, replace the S78 turn signal/multifunction switch.
RENDER: 1.0x
NO RELATED
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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.