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Home >> Buick >> 2012 >> Regal Turbo, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting System >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool Headlamps On Switch parameter while turning the headlamp switch ON and OFF. The reading should toggle between Active and Inactive.
    • If the reading does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  2. Observe the scan tool Automatic Headlamps Disable Switch parameter while applying and releasing the automatic lamp control disable switch. The reading should toggle between Active and Inactive.
    • If the reading does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  3. Observe the scan tool Headlamps Flash Switch parameter while applying and releasing the flash to pass switch. The reading should toggle between Active and Inactive.
    • If the reading does not change between the commanded states, refer to Turn Signal/Multifunction Switch Malfunction in Circuit/System Testing .
  4. Observe the scan tool High Beam Select Switch parameter while applying and releasing the high beam select switch. The reading should toggle between Active and Inactive.
    • If the reading does not change between the commanded states, refer to Turn Signal/Multifunction Switch Malfunction in Circuit/System Testing .
  5. Command the Headlamp Low Beam Command ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when changing between the commanded states.
    • If the low beam headlamps do not turn ON and OFF when changing between the commanded states, refer to Headlamps Malfunction - Low Beam in Circuit/System Testing .
  6. Turn the high beam headlamps ON and OFF with the turn signal/multifunction switch. The high beam headlamps should turn ON and OFF when changing between the selected states.
    • If the high beam headlamps do not turn ON and OFF when changing between the selected states, refer to Headlamps Malfunction - High Beam in Circuit/System Testing .
  7. Command the All Indicators Test ON and OFF with a scan tool. The high beam indicator should turn ON and OFF when changing between the commanded states.
    • If the high beam indicator illuminates during the test, replace the K9 BCM.
    • If the high beam indicator does not illuminate during the test or remains illuminated at all times, replace the P16 instrument cluster.
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