GM Repair Problems? Ask GM Repair Expert Now.
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In your under hood fuse panel there should be a relay labeled HDLP LO.This relay can fail and cause this here.In some cases you can tell this is the component at fault by tapping on this relay.If the low beams then operate then this relay needs replaced.The other issue I have seen is a fault with the multi function (hi/low beam selector switch) on the steering column.The contacts in this switch will fail and can fail to send the correct signals to engage the low beams.
The signals would need tested to be sure the switch and relay are at fault using a multi meter.Most common on this model though can be this relay itself at fault needing replaced.
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