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Instrument Cluster Inoperative

  1. Disconnect instrument cluster connector. Turn ignition on. Using a DVOM, measure voltage between instrument cluster connector terminal B9 (Purple wire) and ground. See Fig 1 . If battery voltage is measured, go to next step. If battery voltage does not exist, go to step 5).
  2. Measure voltage between instrument cluster connector terminal A1 (Orange wire) and ground. See Fig 1 . If battery voltage is measured, go to next step. If battery voltage does not exist, go to step 7).
  3. Measure voltage between instrument cluster connector terminal B9 (Purple wire) and terminal B10 (Black/White wire). See Fig 1 . If battery voltage is measured, go to next step. If battery vol tage does not exist, go to step 9).
  4. Measure voltage between instrument cluster connector terminal A1 (Orange wire) and terminal A4 (Black/White wire). See Fig 1 . If battery voltage is measured, Replace instrument cluster. If battery voltage does not exist, go to step 10).
  5. Measure voltage between Left Hand Instrument Panel Bussed Electrical Center (LH I/P BEC) connector C1 terminal C9 and ground. See Fig 2 . If battery voltage exists, go to next step. If battery voltage does not exist, Replace Left Hand Instrument Panel Bussed Electrical Center (LH I/P BEC).
  6. Locate and repair open in Purple wire between LH I/P BEC connector C1 terminal C9 and Instrument Cluster connector terminal B9. See appropriate WIRING DIAGRAM  .
  7. Using a DVOM, backprobe terminal A12 of LH I/P BEC connector C1 and ground. If battery voltage exists, go to next step. If battery voltage does not exist, Replace Left Hand Instrument Panel Bussed Electrical Center (LH I/P BEC).
  8. Locate and repair open in Orange wire between LH I/P BEC connector C1 terminal A12 and Instrument Cluster connector terminal A1. See appropriate WIRING DIAGRAM  .
  9. Locate and repair open in Black/White wire between instrument cluster connector terminal B10 and ground splice, located at front of engine. See appropriate WIRING DIAGRAM  .
  10. Locate and repair open in Black/White wire between instrument cluster connector terminal A4 and ground splice, located at left side of instrument panel. See appropriate WIRING DIAGRAM  .
Fig 1: Identifying Instrument Cluster Connector Terminals (BFC Connector C1 shown, Connectors C2 & C3 Similar)
G97I28421Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Left Hand Instrument Panel Bussed Electrical Center Connector C1 Terminals
G97B28424Courtesy of GENERAL MOTORS CORP.