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Mph (Km/H) Indicator Inoperative

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on. Connect scan tool to DLC. Use scan tool to check for DTCs. If DTC B1532 is set, go to DTC B1532: DIC SWITCH 5 SIGNAL (SHORT TO GROUND)  under DIAGNOSTIC TESTS. If DTCs are not set, go to next step.
  3. Depress E/M button on Driver's Information Display (DIC) controls to toggle between english and metric displays. See Figure . If km/h and MPH indicators alternate, system is okay at this time. If km/h and MPH indicators do not alternate, go to next step.
  4. Select IPC special functions on scan tool. Command MPH and km/h indicators on and off. If MPH and km/h indicators turn on and off, go to next step. If MPH and km/h indicators do not turn on and off, go to step  9 .
  5. Check for open in Red or Gray wire between IPC and DIC controls. See WIRING DIAGRAMS  . If faulty circuit is found, repair as necessary and go to step  11 . If circuits are okay, go to next step.
  6. Check instrument panel cluster connector for loose or poor connections. If connections are faulty, repair as necessary and go to step  11 . If connections are okay, go to next step .
  7. Check DIC controls connector for loose or poor connections. If connections are faulty, repair as necessary and go to step  11 . If connections are okay, go to next step .
  8. Replace DIC controls. See DRIVER INFORMATION CENTER (DIC) & HEAD-UP DISPLAY (HUD) CONTROL SWITCHES  under REMOVAL & INSTALLATION. After repairs, go to step  11 .
  9. Check for faulty MPH indicator bulb. If bulb is faulty, repair as necessary and go to step  11 . If bulb is okay, go to next step.
  10. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  11. Turn ignition off and reconnect all disconnected components and connectors. Turn ignition on. Go to INSTRUMENT PANEL CLUSTER (IPC) DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
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