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.
2018 Buick Regal BaseFACTORY OEM SERVICE PROCEDURE
A26 HVAC Controls
WARNING: This page is about a different car, the 2020 Buick Regal TourX, 2020 Buick Regal, 2019 Buick Regal TourX, and 2019 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
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray Name | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | Not Available | No Tool Required | Not Available | Not Available | Not Available | Not Available | Not Available |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | - | RD/BU | 3240 | Secondary Fused Battery Positive Voltage 32 | I | - |
| 2 | - | - | - | Not Occupied | - | - |
| 3 | - | GN | 5060 | Low Speed GMLAN Serial Data | I | - |
| 4 - 8 | - | - | - | Not Occupied | - | - |
| 9 | - | GN/YE | 7531 | HVAC Control Module LIN Bus 1 | I | - |
| 10 | - | BK | 1650 | Ground 16 | I | - |
Factory Service Tools
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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.
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