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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1407 (ANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEM)COMPONENT LOCATORABS CONNECTORS
2003 Chevrolet TrailBlazer 4.2 S, 4WD

ABS Connectors

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION ABS Connectors
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Electronic Brake Control Module (EBCM) Connector C1 Terminals

GM684792Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12052613
  • 2-Way F Metri Pac 480 Sealed (BK)
Pin Wire Color Circuit No. Function
A BK 1850 Ground
B RD 642 Battery Positive Voltage
Electronic Brake Control Module (EBCM) Connector C2 Terminals - w/NW7

GM365992Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12193519
  • 16-Way F Micro-Pack 100W (BK)
Pin Wire Color Circuit No. Function
A1 BN 441 Ignition 3 Voltage
A2 YE 873 Left Front Wheel Speed Sensor Low Reference
A3 D-GN 872 Right Front Wheel Speed Sensor Signal
A4 TN/BK 464 Delivered Torque Signal (2WD)
A5 - - Not Used
A6 WH 1808 Traction Control Off Indicator Control
A7 - - Not Used
A8 BN/WH 1571 Traction Control Switch Signal
B1 YE/BK 1827 Vehicle Speed Signal
B2 L-BU 830 Left Front Wheel Speed Sensor Signal
B3 TN 833 Right Front Wheel Speed Sensor Low Reference
B4 OG/BK 463 Requested Torque Signal (2WD)
B5 PU 420 TCC Brake Switch /Cruise Control Release Signal
B6 L-BU 1122 ABS/TCS Class 2 Serial Data
B7 L-BU 832 Traction Control Active Indicator Control
B8 PU 333 Brake Fluid Level Sensor Signal
Electronic Brake Control Module (EBCM) Connector C2 Terminals - w/o NW7

GM861663Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 15339077
  • 20-Way F Micro-Pack 100W (BK)
Pin Wire Color Circuit No. Function
A1 YE 873 Left Front Wheel Speed Sensor Low Reference
A2 D-GN 872 Right Front Wheel Speed Sensor Signal
A3 PU 420 TCC Brake Switch /Cruise Control Release Signal
A4-A8 - - Not Used
A9 L-BU 1122 ABS/TCS Class 2 Serial Data
A10 PU 333 Brake Fluid Level Sensor Signal
B1 L-BU 830 Left Front Wheel Speed Sensor Signal
B2 TN 833 Right Front Wheel Speed Sensor Low Reference
B3 YE/BK 1827 Vehicle Speed Signal
B4-B9 - - Not Used
B10 BN 441 Ignition 3 Voltage
Inverting Driver Module Connector Terminals (Buick/Oldsmobile w/NW7)

GM40419Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12015410
  • 6-Way F P/C Edgeboard-Standard (GN)
Pin Wire Color Circuit No. Function
A - - Not Used
B PK 639 Ignition 1 Voltage
C WH 1808 Traction Control Off Indicator Control
D BK 2250 Ground
E PU 1681 Traction Control System Passive Indicator Control
F - - Not Used
Traction Control Switch Connector Terminals (Chevrolet/GMC w/NW7)

GM258171Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12065873
  • 7-Way F Micro-Pack 100 Series (BK)
Pin Wire Color Circuit No. Function
1 L-BU 832 Traction Control Active Indicator Control
2 BN/WH 1571 Traction Control Switch Signal
3 PK 639 Ignition 3 Voltage (CJ3)
BN 341 Ignition 3 Voltage (CJ2)
4 PU/WH 1382 LED Dimming Signal
5 WH 1808 Traction Control Off Indicator Control
6 BN/WH 230 Instrument Panel Lamps Dimming Control
7 BK 2250 Ground
Traction Control Switch Connector Terminals (Buick/Oldsmobile w/NW7)

GM258245Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 12089892
  • 7-Way F Micro Pack 100 Series (GY)
Pin Wire Color Circuit No. Function
1 BN/WH 230 Instrument Panel Lamps Dimming Control
2 BN 341 Ignition 3 Voltage
3 PU 1681 Traction Control System Passive Indicator Control
4 BK 2250 Ground
5 PU/WH 1382 LED Dimming Supply
6 BK 2250 Ground
7 - - Not Used
Wheel Speed Sensor Connector Terminals - LF

GM523630Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 15326801
  • 2-Way F GT 150 Series (BK)
Pin Wire Color Circuit No. Function
A L-BU 830 Left Front Wheel Speed Sensor Signal
B YE 873 Left Front Wheel Speed Sensor Low Reference
Wheel Speed Sensor Connector Terminals - RF

GM523630Courtesy of GENERAL MOTORS CORP.
Connector Part Information
  • 15326801
  • 2-Way F GT 150 Series (BK)
Pin Wire Color Circuit No. Function
A D-GN 872 Right Front Wheel Speed Sensor Signal
B TN 833 Right Front Wheel Speed Sensor Low Reference
RENDER: 1.0x

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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.