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Home >> GMC >> 1998 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing & Diagnosis >> Speedometer & Odometer Test >> Speedometer/Odometer Does Not Operate

Speedometer/Odometer Does Not Operate

  1. Disconnect instrument cluster connector. Disconnect VCM connector C4 (gasoline) or vehicle speed sensor buffer connector (diesel). Connect test light between instrument cluster connector terminal No. 14 (Dark Green wire) and ground. See Figure. See WIRING DIAGRAMS. If test light does not illuminate, go to next step. If test light illuminates, repair short to ground in Dark Green wire between instrument cluster and VCM (gasoline), or vehicle speed sensor buffer (diesel).
  2. Connect test light between instrument cluster connector terminal No. 14 (Dark Green wire) and VCM connector C4 (gasoline) terminal No. 4 (Dark Green wire), or vehicle speed sensor buffer connector (diesel) terminal No. 15 (Dark Green wire). See WIRING DIAGRAMS . If test light illuminates, replace instrument cluster. If test light does not illuminate, repair open in Dark Green wire between instrument cluster and VCM (gasoline), or vehicle speed sensor buffer (diesel).
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