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Home >> Cadillac >> 2008 >> STS V >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Electrical Component Locations >> Wiring Systems And Power Management - Component Connector End Views - 2 Of 5 >> Engine Control Module (ECM) X1 (LH2)
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Engine Control Module (ECM) X1 (LH2)

Fig 1: Engine Control Module (ECM) X1 (LH2) Connector End View
GM1228485Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X1 (LH2)

Pin Wire Circuit Function
1-6 - - Not Used
7 0.35 WH 17 Stop Lamp Switch Signal
8 - - Not Used
9 0.5 TN 2759 Low Reference
10-11 - - Not Used
12 0.35 BN/WH 419 MIL Control
13 0.5 D-GN/WH 465 Fuel Pump Relay Control (Primary)
14-17 - - Not Used
18 0.35 YE/BK 5728 ECM/TCM Serial Data Wake Up
19 0.75 PK 239 Run/Crank Ignition 1 Voltage
20 0.5 RD/WH 1440 Battery Positive Voltage
21-32 - - Not Used
33 0.5 WH/BK 1164 Accelerator Pedal Position 5-Volt Reference (1)
34 0.5 GY 2709 5-Volt Reference
35 0.5 TN 1274 5-Volt Reference
36 0.5 BN 1271 Low Reference
37 0.5 PU 1272 Low Reference
38 - - Not Used
39 0.35 BN 818 Vehicle Speed Signal
40 0.5 BN 5069 Powertrain Relay Control
41-43 - - Not Used
44 0.35 D-BU 1936 Fuel Level Sensor Signal (Secondary)
45 0.35 L-BU 1937 Secondary Fuel Level Sensor Signal
46 - - Not Used
47 0.5 D-BU 1161 APP Sensor 1 Signal
48 0.5 D-GN 890 Fuel Tank Pressure Sensor Signal
49 0.5 L-BU 1162 APP Sensor 2 Signal
50-52 - - Not Used
53 0.35 D-GN/WH 459 A/C Compressor Clutch Relay Control
54 0.35 D-BU 473 High Speed Cooling Fan Relay Control
55 0.75 WH 1310 EVAP Canister Vent Solenoid Control
56 0.35 YE 447 Starter Relay Coil Control
Connector Part Information 
  • OEM: 34576-0703
  • Service: 88988373
  • Description: 56-Way F (BU)
Terminal Part Information 
  • Pins: 7, 18, 34, 39-40, 44-45, 53-54, 56
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 9, 12-13, 19-20, 33, 35-37, 46-49, 55
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: Pins 9, 12-13, 20, 33, 35-37, 46-49 - J/J
  • Core/Insulation Crimp: Pins 19, 55 - K/K
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
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