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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 735 (Lighting Systems) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Headlamp On Switch parameter while turning the headlamp switch ON and OFF. The parameter should change between Active and Inactive.
    • If the parameter does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  2. Observe the scan tool Headlamp Off Switch parameter while turning the headlamp switch ON and OFF. The parameter should change between Active and Inactive.
    • If the parameter does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  3. Observe the scan tool Flash to Pass Switch parameter while applying and releasing the flash to pass switch. The parameter should change between Active and Inactive.
    • If the parameter does not change between the commanded states, refer to Headlamp 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 parameter should change between Active and Inactive.
    • If the parameter does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  5. Ignition ON, observe the scan tool Low Beam Relay Command parameter while turning the headlamp switch to the LOW and HIGH beam positions. The parameter should change between On and Off.
    • If the parameter does not change between the commanded states, refer to Headlamp Switch Malfunction in Circuit/System Testing .
  6. Ignition ON, command the Low Beam Headlamps ON and OFF with the headlamp switch. 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 commanded, refer to Headlamps Malfunction - Low Beam.
  7. Ignition ON, with a scan tool command the High Beams ON and OFF. The high beam headlamps should turn ON and OFF when changing between the commanded states.
    • If the high beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction - High Beam.
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