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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 728 (WIRING SYSTEMS - SPECIFICATIONS, COMPONENT VIEWS AND CONNECTOR END VIEWS)REPAIR INSTRUCTIONSINSTRUMENT PANEL ELECTRICAL CENTER OR JUNCTION BLOCK REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Bracket To Electrical Wiring Junction Block
    GM820741Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Remove the right door sill plate. Refer to Door Sill Plate Replacement in Interior Trim.
  3. Remove the floor kick-up pad on the passenger side. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.
  4. Remove the retaining bolt which secures the multi-use bracket to the electrical wiring junction block.
    5. Fig 2: 64-Way Block Connectors & 3 I/P Wiring Harness Connectors
    GM820742Courtesy of GENERAL MOTORS CORP.
  5. Disengage the retaining clip from the outboard side, twist the electrical wiring block, and pull outward.
  6. Remove the battery cable lead.
  7. Disconnect 3 64-way block connectors and 3 I/P wiring harness connectors.
  8. Transfer all fuses and relays as required.
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.