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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1904 (Lighting System) >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Headlamp 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.
  2. Observe the scan tool Auto Hdlp. Disable Sw. parameter while applying and releasing the automatic lamp control disable switch. The parameter should change between Active and Inactive.
    • If the parameter does not change between the commanded states, refer to Headlamp Switch Malfunction.
  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 Turn Signal/Multifunction Switch Malfunction.
  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 Turn Signal/Multifunction Switch Malfunction.
  5. Command the Low Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when commanded.
    • If the low beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction - Low Beam.
  6. Command the High Beams ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when commanded.
    • If the high beam headlamps do not turn ON and OFF when commanded, refer to Headlamps Malfunction - High Beam.
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