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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Lighting Systems) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Headlamp Off Switch parameter while cycling the headlamp switch between the Auto and Off positions. The parameter should cycle between Active and Inactive.
    • If the parameter does not cycle between the specified values, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  2. Observe the scan tool Low Beam Switch parameter while cycling the headlamp switch between the Auto and Head position. The parameter should cycle between On and Off.
    • If the parameter does not cycle between the specified values, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  3. With the headlamps ON, observe the scan tool Flash to Pass Switch parameter while pulling and releasing the flash to pass switch. The parameter should cycle between Active and Inactive.
    • If the parameter does not cycle between the specified values, refer to Headlamp Dimmer Switch Malfunction in Circuit/System Testing .
  4. With the headlamps ON, observe the scan tool High Beam Switch parameter while switching the headlamp dimmer switch between the low and high beam positions. The parameter should cycle between Active and Inactive.
    • If the parameter does not cycle between the specified values, refer to Headlamp Dimmer Switch Malfunction in Circuit/System Testing .
  5. Command the Low Beam/DLR ON and OFF with a scan tool. Verify the low beam headlamps turn ON and OFF when changing between the commanded states.
    • If the low beam headlamps do not cycle between the commanded states, refer to Low Beam Headlamp Malfunction in Circuit/System Testing .
  6. Command the High Beams ON and OFF with a scan tool. Verify the low beam headlamps turn ON and OFF when changing between the commanded states.
    • If the high beam headlamps do not cycle between the commanded states, refer to High Beam Headlamp Malfunction in Circuit/System Testing .
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