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Instrument Cluster Speedometer Does Not Function

  1. Disconnect instrument cluster connector. Disconnect radio Gray 10-pin connector C2. Disconnect multi-function alarm module connector C1. Disconnect cruise control module connector. Disconnect Powertrain Control Module (PCM) Black 80-pin connector C2. Using DVOM, check voltage between instrument cluster harness connector Dark Green/White wire terminal (B3 on Cavalier, B2 on Sunfire) and ground. If zero volts exist, go to next step. If zero volts does not exist, go to step  3 .
  2. Using DVOM, check resistance between instrument cluster harness connector Dark Green/White wire terminal (B3 on Cavalier, B2 on Sunfire) and ground. If resistance is infinite, go to step  4 . If resistance is not infinite, go to step  5 .
  3. Repair short to voltage in Dark Green/White wire between instrument cluster, cruise control module, radio connector C2, multi-function alarm module connector C1 and PCM connector C2. See WIRING DIAGRAMS  . Recheck system operation.
  4. Using DVOM, check resistance between instrument cluster harness connector Dark Green/White wire terminal (B3 on Cavalier, B2 on Sunfire) and PCM connector C2 terminal No. 16 (Dark Green/White wire). If resistance is 0-2 ohms, go to step  6 . If resistance is not 0-2 ohms, go to step  7 .
  5. Repair short to ground in Dark Green/White wire between instrument cluster, cruise control module, radio connector C2, multi-function alarm module connector C1 and PCM connector C2. See WIRING DIAGRAMS  . Recheck system operation.
  6. Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Recheck system operation. If system is still not operating properly, replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
  7. Repair open in Dark Green/White wire between instrument cluster and PCM connector C2. Recheck system operation.
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