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HOMESERVICE MANUALSBUICK2010LUCERNE CXL, 3.9 1REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 314 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - 1-2 SHIFT SOLENOID THROUGH ENGINE CONTROL MODULE X1)COMPONENT CONNECTOR END VIEWSENGINE CONTROL MODULE (ECM) X1
2010 Buick Lucerne CXL, 3.9 1

Engine Control Module (ECM) X1

2010 Buick Lucerne CXL, 3.9 1SECTION Engine Control Module (ECM) X1
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.
Fig 1: Engine Control Module (ECM) X1 Connector End View
GM784851Courtesy of GENERAL MOTORS COMPANY
Engine Control Module (ECM) X1

Pin Wire Circuit Function
1-6 - - Not Used
7 0.5 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 0.5 BN 2759 Low Reference
10-11 - - Not Used
12 0.35 BN/WH 419 MIL Control
13 0.5 GN/WH 465 Fuel Pump Relay Control
14-17 - - Not Used
18 0.5 D-BU 5985 Accessory Wake up Serial Data
19 0.5 PK 439 Ignition 1 Voltage
20 0.5 RD/WH 4640 Battery Positive Voltage
21-25 - - Not Used
26 0.5 YE 447 Starter Relay Coil Control
27-32 - - Not Used
33 0.5 WH/BK 1164 5-Volt Reference 2
34 0.5 GY 416 5-Volt Reference 1
35 0.5 BN/BK 1274 5-Volt Reference 1
36 0.5 TN 1271 Low Reference
37 0.5 PU/WH 1272 Low Reference
38-39 - - Not Used
40 0.5 OG/WH 5069 PWTRAIN Relay Control
41-43 - - Not Used
44 0.5 PU/BK 1589 Primary Fuel Level Sensor Signal
45-46 - - Not Used
47 0.5 D-BU/WH 1161 APP Sensor 1 Signal
48 0.35 GN 890 Fuel Tank Pressure Sensor Signal
49 0.5 L-BU 1162 APP Sensor 2 Signal
50 - - Not Used
51 0.5 PU 421 Air Solenoid Relay Control
52 - - Not Used
53 0.5 GN/WH 459 A/C Compressor Clutch Relay Control
54 0.5 OG 473 High Speed Cooling Fan Relay Control
55 0.5 BN/WH 1310 EVAP Canister Vent Solenoid Control
56 - - Not Used
Connector Part Information
  • Harness Type: Engine
  • OEM Connector: 34576-2803
  • Service Connector: 88988373
  • Description: 56-Way F MX123 34576 Series (BK)
Terminal Part Information
  • Terminated Lead: 13575575
  • Release Tool: J-38125-213
  • Diagnostic Test Probe: J-35616-64B (L-BU)
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
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.