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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 74 (INSTRUMENT PANEL - ANALOG)SYSTEM TESTSINSTRUMENT PANEL CLUSTER (IPC) POWER & GROUND CHECK
1999 GMC Forward Control 5.7 R, Automatic

Instrument Panel Cluster (IPC) Power & Ground Check

1999 GMC Forward Control 5.7 R, AutomaticSECTION Instrument Panel Cluster (IPC) Power & Ground Check
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Sonoma, 1999 GMC Jimmy, 1999 GMC Envoy, and 1999 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Using test light connected to ground, probe IPC connector terminal A8 (Pink wire). See Fig 1 . If test light does not illuminate, go to next step. If test light illuminates, go to step 3).
  2. Repair open in Pink wire between IPC connector terminal A8 and CLSTR fuse (10-amp), located in instrument panel fuse block. See WIRING DIAGRAMS  . Retest operation.
  3. Turn ignition on. Using test light connected to ground, probe IPC connector terminal A7 (Pink wire). If test light does not illuminate, go to next step. If test light illuminates, go to step 5).
  4. Repair open in Pink wire between IPC connector terminal A7 and GAUGES fuse (10-amp), located in instrument panel fuse block. See WIRING DIAGRAMS  . Retest operation.
  5. Using test light connected to ground, probe IPC connector terminal B2 (Gray wire). Turn headlights on. Adjust dimmer switch to maximum intensity. If test light does not illuminate, go to next step. If test light illuminates, go to step 7).
  6. Repair open in Gray wire between instrument panel fuse block and IPC connector terminal B2. Retest operation.
  7. Using test light connected to ground, probe IPC connector terminal A10 (Orange wire). If test light does not illuminate, go to next step. If test light illuminates, go to step 9).
  8. Repair open in Orange wire between instrument panel fuse block and IPC connector terminal A10. Retest operation.
  9. Connect test light between IPC connector terminal A10 (Orange wire) and IPC connector terminal A9 (Black/White wire). If test light does not illuminate, go to next step. If test light illuminates, go to step 11).
  10. Repair open in Black/White wire between IPC connector terminal A9 and ground. Retest operation.
  11. Connect test light between IPC connector terminal A10 (Orange wire) and IPC connector terminal B3 (Black wire). If test light does not illuminate, go to next step. If test light illuminates, power and ground circuits are okay. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK  .
  12. Repair open in Black wire between IPC connector terminal B3 and ground. Retest operation.
Fig 1: Identifying Instrument Panel Cluster (IPC) & Body Control Module (BCM) Connector C1 & C2 Terminals
G98E00996Courtesy of GENERAL MOTORS CORP.
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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.