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Circuit/System Verification

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 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 reading should change between Active and Inactive.
  2. Ignition ON, observe the scan tool Headlamp Off Switch parameter while turning the headlamp switch ON and OFF. The reading should change between Active and Inactive.
  3. Observe the scan tool Flash to Pass Switch parameter while applying and releasing the turn signal/multifunction switch. The reading should toggle between Active and Inactive.
  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.
  5. Command the Low Beam/DRLs ON and OFF with a scan tool. The low beam headlamps should turn ON and OFF when commanded.
  6. Command the High Beams ON and OFF with a scan tool. The high beam headlamps should turn ON and OFF when commanded.
  7. Command the Display 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 BCM.
    • If the high beam indicator does not illuminate during the test or remain illuminated at all times, replace the instrument cluster.
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