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
K33 HVAC Control Module X2
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
|
Terminal Part Information
| Terminal Type ID | Terminated Lead | Diagnostic Test Probe | Terminal Removal Tool | Service Terminal | Tray Name | Core Crimp | Insulation Crimp |
|---|---|---|---|---|---|---|---|
| I | Not Required | J-35616-64B (LT BU) | No Tool Required | Not Available | Not Available | Not Available | Not Available |
| I | Not Required | J-35616-64B (LT BU) | No Tool Required | Not Available | Not Available | Not Available | Not Available |
| II | Not Required | J-35616-64B (LT BU) | No Tool Required | Not Required | Not Required | Not Required | Not Required |
| Pin | Size | Color | Circuit | Function | Terminal Type ID | Option |
|---|---|---|---|---|---|---|
| 1 | 0.22 | RD/WH | 3440 | Secondary Fused Battery Positive Voltage 34 | I | IOR/IOR+UST |
| 2 | 0.08 | GN | 5060 | Low Speed GMLAN Serial Data | II | IOR/IOR+UST |
| 3 | 0.08 | GN | 5060 | Low Speed GMLAN Serial Data | II | IOR/IOR+UST |
| 4 | 0.22 | GN/YE | 7531 | HVAC Control Module LIN Bus 1 | I | IOR/IOR+UST |
| 5 | - | - | - | Not Occupied | - | - |
| 6 | - | GN/BU | 4119 | HVAC Control Module LIN Bus 2 | I | - |
| 7 | - | - | - | Not Occupied | - | - |
| 8 | - | BK | 1650 | Ground 16 | I | - |
| 9 | - | VT/GY | 539 | Run/Crank Ignition 1 Voltage 5 | I | - |
| 10 | - | BU/YE | 7574 | A/C Compressor Solenoid Valve Control | I | - |
| 11 | - | BU/BN | 7573 | A/C Compressor Solenoid Valve Control | I | - |
| 12 - 14 | - | - | - | Not Occupied | - | - |
| 15 | - | BU/GY | 754 | Blower Motor Speed Control | I | - |
| 16 - 17 | - | - | - | Not Occupied | - | - |
| 18 | - | BN | 7567 | Solar Sensor Low Reference | I | - |
| 19 | - | BN/VT | 193 | Rear Defogger Relay Control | I | - |
| 20 | - | - | - | Not Occupied | - | - |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.