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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) X3 (LC3)
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Engine Control Module (ECM) X3 (LC3)

Fig 1: Engine Control Module (ECM) X3 (LC3) Connector End View
GM1650395Courtesy of GENERAL MOTORS CORP.
Engine Control Module (ECM) X3 (LC3)

Pin Wire Circuit Function
1-2 - - Not Used
3 0.5 TN/WH 3211 HO2S Low Signal (Bank 2 Sensor 1)
4 0.5 PU/WH 3210 HO2S High Signal (Bank 2 Sensor 1)
5 0.5 PU 3220 HO2S High Signal (Bank 2 Sensor 2)
6 0.5 TN 3221 HO2S Low Signal (Bank 2 Sensor 2)
7 0.5 OG 225 Generator Turn On Signal
8-13 - - Not Used
14 0.35 L-BU 7126 Super Charger Vacuum Bypass Valve Control
15 0.5 L-GN 3212 HO2S Heater Low Control (Bank 2 Sensor 1)
16 0.35 PK 2014 Coolant Pump Relay Control
17 - - Not Used
18 0.35 BN 1174 Oil Level Switch Signal
19-20 - - Not Used
21 0.5 BK/WH 2751 Low Reference
22 0.35 OG/BK 6014 BARO Sensor Low Reference
23 0.5 OG/BK 469 Low Reference
24-28 - - Not Used
29 0.35 GY 23 Generator Field Duty Cycle Signal
30-32 - - Not Used
33 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
34 0.35 YE/BK 6120 IAT2 Low Reference
35 0.35 TN 2761 Low Reference
36 - - Not Used
37 0.5 GY 2700 5-Volt Reference
38 0.35 WH/BK 2932 5-Volt Reference
39 0.5 GY 2704 5-Volt Reference
40-45 - - Not Used
46 0.5 OG/BK 1786 Park/Neutral Signal
47 - - Not Used
48 0.75 PU 428 EVAP Canister Purge Solenoid Control
49 0.35 D-GN 335 Low Speed Cooling Fan Relay Control
50 0.5 OG/BK 3223 HO2S Heater Low Control (Bank 2 Sensor 2)
51-52 - - Not Used
53 0.5 TN-BK 2500 High Speed GMLAN Serial Data Bus +
54 - - Not Used
55 0.5 YE 410 ECT Sensor Signal
56 0.35 L-BU 6118 IAT2 Signal
57 0.5 OG/BK 380 A/C Refrigerant Pressure Sensor Signal
58 0.35 GY/BK 433 BARO Sensor Signal
59 0.5 L-GN 432 MAP Sensor Signal
60-72 - - Not Used
73 2 BK/WH 1551 Ground
Connector Part Information 
  • OEM: 34566-3303
  • Service: 88988372
  • Description: 73-Way F (GY)
Terminal Part Information 
  • Pins: 3-7, 14-16, 18, 21-23, 29, 33-35, 37-39, 46, 50, 53, 55-59
  • Terminal/Tray: 33467-0005/23
  • Core/Insulation Crimp: J/J
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pins: 48-49
  • Terminal/Tray: 33467-0003/23
  • Core/Insulation Crimp: H/H
  • Release Tool/Test Probe: J-38125-213/J-35616-64B (L-BU)
  • Pin: 73
  • Terminal/Tray: 7116-4152-02/9
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-35 (VT)
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