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 MANUALSBUICK2010LUCERNE CXL, 3.9 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 320 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - ENGINE CONTROL MODULE X2 THROUGH PRESSURE CONTROL SOLENOID)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X3
2010 Buick Lucerne CXL, 3.9 1
Engine Control Module (ECM) X3
2010 Buick Lucerne CXL, 3.9 1SECTION Engine Control Module (ECM) X3
WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Engine Control Module (ECM) X3
| Pin | Wire | Circuit | Function |
|---|---|---|---|
| 1-2 | - | - | Not Used |
| 3 | 0.5 BN/WH | 3211 | HO2S Low Reference Bank 1 Sensor 1 |
| 4 | 0.5 PU/WH | 3210 | HO2S Reference Voltage Bank 1 Sensor 1 |
| 5-6 | - | - | Not Used |
| 7 | 0.5 OG | 225 | Generator Turn On Signal |
| 8 | 0.5 L-GN | 1652 | Reverse Lockout Solenoid Control |
| 9 | 0.5 WH/BK | 436 | AIR Pump Relay Control |
| 10-14 | - | - | Not Used |
| 15 | 0.8 L-GN/WH | 3112 | HO2S Heater Low Control Bank 1 Sensor 1 |
| 16-20 | - | - | Not Used |
| 21 | 0.5 L-BU | 5514 | Low Reference |
| 22 | - | - | Not Used |
| 23 | 0.5 OG/BK | 469 | Low Reference |
| 24-25 | - | - | Not Used |
| 26 | 0.5 WH/GY | 6786 | Low Reference |
| 27-28 | - | - | Not Used |
| 29 | 0.5 GY | 23 | Generator Field Duty Cycle Signal |
| 30-32 | - | - | Not Used |
| 33 | 0.35 BN | 2501 | High Speed GMLAN Serial Data Bus - |
| 34 | - | - | Not Used |
| 35 | 0.35 PK | 2761 | Low Reference |
| 36 | - | - | Not Used |
| 37 | 0.5 GY/BK | 2700 | 5-Volt Reference 1 |
| 38 | - | - | Not Used |
| 39 | 0.5 GY/WH | 2704 | 5-Volt Reference 1 |
| 40-41 | - | - | Not Used |
| 42 | 0.5 TN/WH | 6790 | 5-Volt Reference 2 |
| 43-45 | - | - | Not Used |
| 46 | 0.5 GY/OG | 1786 | Park/Neutral Signal |
| 47 | - | - | Not Used |
| 48 | 0.5 GN/WH | 428 | EVAP Canister Purge Solenoid Control |
| 49 | 0.5 GN | 335 | Low Speed Cooling Fan Relay Control |
| 50-52 | - | - | Not Used |
| 53 | 0.35 BN/BK | 2500 | High Speed GMLAN Serial Data Bus + |
| 54 | - | - | Not Used |
| 55 | 0.5 YE | 410 | ECT Sensor Signal |
| 56 | - | - | Not Used |
| 57 | 0.5 OG/WH | 380 | A/C Refrigerant Pressure Sensor Signal |
| 58 | - | - | Not Used |
| 59 | 0.5 L-GN/BK | 432 | MAP Sensor Signal |
| 60-61 | - | - | Not Used |
| 62 | 0.5 YE/GY | 6788 | Air Injection Position Signal |
| 63-64 | - | - | Not Used |
| 65 | 0.5 YE/GN | 231 | Oil Pressure Switch Signal |
| 66-73 | - | - | Not Used |
Connector Part Information
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Terminal Part Information
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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.