Speedometer/Odometer Does Not Operate
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 GMC Cab & Chassis, and 1999 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before performing following test, ensure no problems exist in vehicle speed sensor, vehicle speed sensor buffer (diesel), or Vehicle Control Module (VCM) (gasoline). See appropriate article in
ENGINE PERFORMANCE, or appropriate
ANTI-LOCK article in BRAKES.
- 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).
- 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).