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 MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSOEM CONNECTOR END VIEWSCONNECTOR END VIEWSHVAC CONTROL MODULE CONNECTOR END VIEW
2005 Buick LeSabre Limited, 4T65E/M15
HVAC Control Module Connector End View
2005 Buick LeSabre Limited, 4T65E/M15SECTION HVAC Control Module Connector End View
HVAC Control Module Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A1 | - | - | Not Used |
| A2 | DK GRN | 44 | Instrument Panel Lamps Dimmer Switch Signal |
| A3 | PPL | 1783 | Twilight Sentinel Delay Signal |
| A4 | YEL | 61 | Low Reference |
| A5 | WHT | 278 | Ambient Light sensor Signal |
| A6 | LT BLU/ BLK |
1688 | 5 Volt Reference |
| A7 | - | - | Not Used |
| A8 | BRN | 141 | Ignition 3 Voltage |
| A9 | BLK/WHT | 351 | Ground |
| A10 | ORN | 1140 | Battery Positive Voltage |
| A11-A12 | - | - | Not Used |
| A13 | GRY/BLK | 754 | Blower Motor Speed Control |
| A14 | PPL | 1807 | Class 2 Serial Data (Primary) |
| A15 | PPL | 1807 | Class 2 Serial Data (Primary) |
| A16 | - | - | Not Used |
| B1-B2 | - | - | Not Used |
| B3 | LT BLU | 1788 | Traction Control Switch Signal |
| B4 | - | - | Not Used |
| B5 | LT GRN | 80 | Key In Ignition Switch Signal |
| B6 | PNK/BLK | 1597 | Interior Lamp Switch On Signal |
| B7 | YEL | 1791 | Air Temperature Valve Motor Low Reference |
| B8 | DK GRN | 1614 | Recirculation Door Motor Control |
| B9 | YEL | 1318 | Mode Control Door |
| B10 | DK BLU | 1199 | Air Temperature Door Control |
| B11-B14 | - | - | Not Used |
| B15 | YEL | 1491 | Backlight Lamps Control |
| B16 | BLK | 350 | Ground |
HVAC Control Module Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| A1 | BLK/WHT | 351 | Ground |
| A2 | BRN | 41 | Ignition 3 Voltage |
| A3-A4 | - | - | Not Used |
| A5 | BLK | 350 | Ground |
| A6 | - | - | Not Used |
| B1 | YEL | 1491 | Backlight Lamps Control |
| B2-B4 | - | - | Not Used |
| B5 | PPL | 1881 | HVAC Control Module Clock Signal |
| B6 | LT BLU | 1880 | HVAC Control Module Data Signal |
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.