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Home >> Saab >> 2011 >> 9-5 Turbo6 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting And Signaling Systems >> Fault diagnosis, symptoms >> High Intensity Discharge Lamp Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:
  • Never open the high intensity discharge system ballast or the arc tube assembly starter.
  • Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
  1. Ignition OFF, disconnect the KR49 Headlamp Low Beam Relay.
  2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
  3. If the test lamp illuminates, test the control circuit for a short to voltage.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.
  5. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  6. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
  7. If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
  8. Disconnect the harness connector at the inoperative headlamp.
  9. Test for less than 5 Ω between the headlamp ground circuit terminal 10 and ground.
  10. If greater than the specified range, test the ground circuit for an open/high resistance.
  11. Connect the harness connector at the headlamp.
  12. Connect a 10 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the headlamp is activated.
  13. If the headlamp does not activate and the jumper wire fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp.
  14. If the headlamp does not activate and the jumper wire fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the headlamp.
  15. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
  16. Command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  17. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
  18. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  19. If all circuits test normal, test or replace the KR49 Headlamp Low Beam Relay.
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