LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2007 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Electrical >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B3621 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the head-up display (HUD) switch.
  2. Test for less than 1.0 ohm of resistance between the HUD switch ground circuit and ground.
    • If greater than 1.0 ohm, test the HUD switch ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Adjust Display Down Switch parameter is Inactive.
    • If not Inactive, test the information down switch signal circuit for a short to ground. If the circuit tests normal, replace the HUD.
  4. Install a 3-A fused jumper wire between the information down switch signal circuit and ground. Verify the scan tool Adjust Display Down Switch parameter is Active.
    • If not Active, test the information down switch signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the HUD.
  5. If all circuits test normal, test or replace the HUD switch.
scientia non olet · About LEMON Manuals