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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 521 (WIRING SYSTEMS AND POWER MANAGEMENT - INTRODUCTION)REPAIR INSTRUCTIONSACCESSORY WIRING JUNCTION BLOCK REPLACEMENTREMOVAL PROCEDURE
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Removal Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Removal Procedure
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
    2. Fig 1: Press Tabs Inward To Lift And Remove Small Junction Block Cover
    GM2081294Courtesy of GENERAL MOTORS CORP.
  2. Press tabs (1) inward to lift and remove the small junction block cover (2).
    3. Fig 2: Press Tabs Inward To Lift And Remove Large Junction Block Cover
    GM2081295Courtesy of GENERAL MOTORS CORP.
  3. Press tabs (1) inward to lift and remove the large junction block cover (2).
  4. Note location and remove harness end nuts and remove harness ends from fuse block relay center.
    5. Fig 3: Fuse Relay Center
    GM881124Courtesy of GENERAL MOTORS CORP.
  5. Remove the fuse block center bolts and remove fuse relay center from the junction block.
    6. Fig 4: Chassis Harness, I/P Harness, Engine Harness, & Forward LP Harness
    GM881126Courtesy of GENERAL MOTORS CORP.
  6. Remove from the junction block base the chassis harness (1), the I/P harness (2), the engine harness (3), and the forward LP harness (4).
    7. Fig 5: Junction Block Base Tabs
    GM881131Courtesy of GENERAL MOTORS CORP.
  7. Remove the junction block base by pressing tabs (1) then slide tabs (2) out.
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.