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.
S78 Turn Signal/Multifunction Switch
2018 Buick Regal BaseSECTION S78 Turn Signal/Multifunction Switch
Connector Part Information
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray Name | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | 13575584 | J-35616-64B (LT BU) | J-38125-12A | Not Available | Not Available | Not Available | Not Available |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.35 | WH/GN | 663 | Hazard Switch Left Turn Signal | I | - |
| 2 | 0.35 | VT/BU | 664 | Hazard Switch Right Turn Signal | I | - |
| 3 | 0.35 | BK | 1650 | Ground | I | - |
| 4 - 5 | - | - | - | Not Occupied | - | - |
| 6 | 0.35 | YE/BN | 307 | Headlamp Switch Flash To Pass Signal | I | - |
| 7 | 0.35 | WH | 524 | Headlamp Dimmer Switch High Beam Signal | I | - |
| 8 - 10 | - | - | - | Not Occupied | - | - |
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:
- • 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.