HVAC Control Module X3 (C67, C42, CJ2 or MEX)
WARNING: This page is about a different car, the 2014 GMC Sierra 3500 HD, 2014 GMC Sierra 2500 HD, 2014 Chevrolet Silverado 3500 HD, and 2014 Chevrolet Silverado 2500 HD. 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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HVAC Control Module X3 (C67, C42, CJ2 or MEX)
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 1 | 0.35 TN | 518 | Lower Left Air Temperature Sensor Signal (CJ2) |
| 2 | 0.35 YE/BK | 713 | Defrost/Heater Mode Valve Position Sensor Signal |
| 3 | 0.35 PU | 1838 | Recirculation Door Position Signal (CJ2) |
| 4 | 0.35 GY/BK | 754 | Blower Motor Speed Control |
| 5-9 | - | - | Not Used |
| 10 | 0.35 GY | 598 | 5-Volt Reference |
| 11 | 0.35 TN | 520 | Lower Right Air Temperature Sensor Signal (CJ2) |
| 12 | 0.35 L-BU | 733 | Air Temperature Door Position Signal (CJ2) |
| 13 | 0.35 D-BU | 1646 | Right Air Temperature Door Position Signal |
| 14 | 0.35 D-BU | 204 | A/C Refrigerant Pressure Sensor Signal (HP2) |
| 0.35 WH | 2622 | Evaporator Temperature Sensor Signal (except HP2) | |
| 15 | 0.35 TN | 2273 | Mode Door Control |
| 16 | 0.35 D-BU | 1199 | Left Air Temperature Door Control (CJ2) |
| 17 | 0.35 D-GN | 1614 | Recirculation Door Control (CJ2 or C67 except MEX, or MEX without C42) |
| 18 | 0.35 WH/BK | 1236 | Right Air Temperature Door Control |
| 19 | 0.5 TN | 914 | Low Reference (HP2) |
| 0.35 TN | 552 | Low Reference (C67) | |
| 20 | 0.35 YE | 1791 | Low Reference |