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 160 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - K73 TCICM X1 THROUGH X85)COMPONENT CONNECTOR END VIEWSS78 TURN SIGNAL/MULTIFUNCTION SWITCH
2013 Buick Regal Turbo Premium, Standard Trans
S78 Turn Signal/Multifunction Switch
2013 Buick Regal Turbo Premium, Standard TransSECTION S78 Turn Signal/Multifunction Switch
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.
Connector Part Information
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Terminal Part Information
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S78 Turn Signal/Multifunction Switch
| Pin | Size | Color | Circuit | Function | Option |
|---|---|---|---|---|---|
| 1 | 0.5 | WH/GN | 663 | Hazard Switch Left Turn Signal | - |
| 2 | 0.5 | WH | 524 | Headlamp Dimmer Switch High Beam Signal | - |
| 3 | 0.5 | BK | 1850 | Ground | - |
| 4 | 0.5 | YE/BN | 307 | Headlamp Switch Flash To Pass Signal | - |
| 5 | 0.35 | VT | 893 | Driver Information Center Select Menu Switch Signal | - |
| 6 | 0.35 | BK/BN | 897 | Low Reference | - |
| 7 | 0.5 | VT/BU | 664 | Hazard Switch Right Turn Signal | - |
| 8-11 | - | - | - | Not Used | - |
| 12 | 0.35 | GN/WH | 1358 | Driver Information Center Switch Signal | - |
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.