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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 748 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - MODE ACTUATOR THROUGH YAW SENSOR)COMPONENT CONNECTOR END VIEWSTRAILER BRAKE CONTROL RELAY (JL1)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Trailer Brake Control Relay (JL1)

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Trailer Brake Control Relay (JL1)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Trailer Brake Control Relay (JL1) Connector End View
GM1664576Courtesy of GENERAL MOTORS CORP.
Trailer Brake Control Relay (JL1)

Pin Wire Circuit Function
A 3 D-BU 47 Trailer Brake Output Supply Voltage
B 3 BK 2150 Ground
C 0.5 TN 945 Integrated Trailer Brake Relay Control Active Low
D 0.5 L-GN 944 Relay Feedback
E 0.5 YE/BK 7521 Solid State Relay Enable
F 3 RD/BK 242 Battery Positive Voltage
Connector Part Information
  • Harness Type: Chassis
  • OEM Connector: 13521467
  • Service Connector: 13506001
  • Description: 6-Way F GT 280 Series, Sealed (BK)
Terminal Part Information
  • Pins: A, B, F
  • Terminated Lead: 13575403
  • Release Tool: J-38125-553
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 15304720/19
  • Core/Insulation Crimp: 4/5
  • Pins: C-E
  • Terminated Lead: 13327132
  • Release Tool: J-38125-553
  • Diagnostic Test Probe: J-35616-4A (PU)
  • Terminal/Tray: 15304719/19
  • Core/Insulation Crimp: E/5
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • 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.