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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 894 (WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - MEMORY SEAT MODULE (X5) TO YAW SENSOR)COMPONENT CONNECTOR END VIEWSSERIAL DATA GATEWAY (SDG) MODULE X1 (HP2)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Serial Data Gateway (SDG) Module X1 (HP2)

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Serial Data Gateway (SDG) Module X1 (HP2)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
GM2506402Courtesy of
Connector Part Information
  • Harness Type: Instrument Panel
  • OEM Connector: 13782499
  • Service Connector: 13578570
  • Description: 20-Way F 0.64 Series (BK)
Terminal Part Information
  • Terminated Lead: 13575550
  • Release Tool: J-38125-559
  • Diagnostic Test Probe: J-35616-16 (L-GN)
  • Terminal/Tray: 15445905/23
  • Core/Insulation Crimp: J/J
Serial Data Gateway (SDG) Module X1 (HP2)

Pin Wire Circuit Function
1 0.5 D-BU 932 APM Wake-Up Signal
2 0.5 TN 968 Wake Up Signal
3-10 - - Not Used
11 0.5 L-BU 6106 PTLAN -
12 0.5 L-BU 6106 PTLAN -
13 0.5 D-BU 6105 PTLAN +
14 0.5 D-BU 6105 PTLAN +
15 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
16 0.5 TN 2501 High Speed GMLAN Serial Data Bus -
17 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
18 0.5 TN/BK 2500 High Speed GMLAN Serial Data Bus +
19 0.35 D-GN 5060 Low Speed GMLAN Serial Data
20 - - Not Used
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.