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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1041 (TRAILER BRAKE CONTROL SYSTEM)COMPONENT LOCATORTRAILER BRAKE CONTROL CONNECTORSTRAILER BRAKE CONTROLLER MODULE (TBCM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Trailer Brake Controller Module (TBCM)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Trailer Brake Controller Module (TBCM)
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trailer Brake Controller Module (TBCM) Connector End View
GM1711002Courtesy of GENERAL MOTORS CORP.
Trailer Brake Controller Module (TBCM) Connector Parts Information

Connector Part Information 
  • OEM: 15491307
  • Service: See Catalog
  • Description: 47-Way F ASG Series (BK)
Terminal Part Information 
  • Pins: 1, 32
  • Terminal/Tray: 15476168/5
  • Core/Insulation Crimp: F/3
  • Release Tool/Test Probe: 15315247/J-35616-42 (RD)
  • Pins: 2, 6-9, 10-11, 14-15, 17, 21-22, 25, 28, 33, 37
  • Terminal/Tray: 7116-3703-02/14
  • Core/Insulation Crimp: 9/9
  • Release Tool/Test Probe: J-38125-215/J-35616-64B (L-BU)
Trailer Brake Controller Module (TBCM) Connector Terminal Identification

Pin Wire Color Circuit No. Function
1 2 BK 1750 Ground
2 0.5 D-BU 7632 5-Volt Reference
3-5 - - Not Used
6 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
7 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
8 0.5 TN 7631 Low Reference
9 0.5 L-GN 944 Relay Feedback
10 0.5 YE 7635 Integrated Trailer Brake Controller Manual Apply Signal
11 0.5 L-GN/BK 7633 Integrated Trailer Brake Controller User Gain Signal
12-13 - - Not Used
14 0.5 TN 945 Integrated Trailer Brake Relay Control Active Low
15 0.5 PK 239 Ignition 1 Voltage
16 - - Not Used
17 0.5 L-BU 5986 Serial Data Communication Enable
18-20 - - Not Used
21 0.5 TN 2501 High Speed GMLAN Serial Data Bus-
22 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus+
23-24 - - Not Used
25 0.5 BN 7634 Integrated Trailer Brake Controller Redundant Manual Apply Signal
26-27 - - Not Used
28 0.5 D-BU 47 Solid State Relay Feedback
29-31 - - Not Used
32 2 RD/WH 4340 Battery Positive Voltage
33 0.5 YE/BK 7521 Solid State Relay Enable
34-36 - - Not Used
37 0.5 L-BU/WH 6311 TCC Brake Signal
38-47 - - Not Used
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.