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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1793 (HYBRID CONTROL SYSTEM)COMPONENT LOCATORHYBRID CONTROLS CONNECTOR END VIEWSSTARTER GENERATOR CONTROL MODULE (SGCM) - C1
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Starter Generator Control Module (SGCM) - C1

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Starter Generator Control Module (SGCM) - C1
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Starter Generator Control Module (SGCM) - C1 Connector End Views
GM39784Courtesy of GENERAL MOTORS CORP.
Starter Generator Control Module (SGCM) - C1 Connector Parts Information

Connector Part Information 
  • OEM: 12129225
  • Service: See Catalog
  • Description: 24-Way F (BK)
Terminal Part Information 
  • Pins: 47
  • Terminal/Tray: 7116-4141-02/10
  • Core/Insulation Crimp: 4/3
  • Release Tool/Test Probe: 12094430/J-35616-42 (RD)
  • Pins: 1, 16
  • Terminal/Tray: 7116-4142-02/10
  • Core/Insulation Crimp: Pins 1 - A/3
  • Core/Insulation Crimp: Pins 16 - D/3
  • Release Tool/Test Probe: 12094430/J-35616-42 (RD)
  • Pins: 3, 11, 12, 13, 14, 18, 19, 22, 29, 33, 34, 36, 37, 42, 43, 45, 46, 8
  • Terminal/Tray: 638551-1/16
  • Core/Insulation Crimp: Pins 3, 11, 12, 13, 14, 18, 19, 22, 29, 33, 34, 36, 37, 42, 43, 45, 46 - K/K
  • Core/Insulation Crimp: Pins 8 - J/J
  • Release Tool/Test Probe: 15315247/J-35616-64B (L-BU)
Starter Generator Control Module (SGCM) - C1 Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 GY/BK 7439 Hybrid Control Module Pump Motor Voltage Reference
2 OG/WH 5537 Transmission Pump Relay Coil Control
3 - - Not Used
4 L-GN/BK 6554 Water Pump Supply Voltage
5 GY 7622 Hill Hold Valve Relay Control
6 TN 2022 Eng/Tran Cooling
7-10 - - Not Used
11 TN/WH 2500 High Speed GMLAN Serial Data (+)
12 TN/WH 2500 High Speed GMLAN Serial Data (+)
13 - - Not Used
14 D-GN/WH 7621 Transmission Pump Driver Error
15 BK/PU 7438 Hybrid Control Module Pump Control
16 L-GN 5531 Hood Closed Switch Signal
17 PK/BK 109 Hood Ajar Switch Signal
18-22 - - Not Used
23 TN 2501 High Speed GMLAN Serial Data (-)
24 TN 2501 High Speed GMLAN Serial Data (-)
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.