Your in for a real treat.... i had a similar problem with mine, the
stock gm wiring is terrible, your best bet pull the wiring apart in the
front of the car and inspect each wire splice they tend to corrode and
once it gets to a certain point it wont allow any electricity to pass,
i ended up rewiring the entire headlight system myself. you can get the wiring diagram from the haynes manual. good luck
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the lights that turn on when the car is started are the driving lights that are common in newer cars,, once you select the lights on the switch, these will turn off and the low beams take over,, High beams with a 4 light system is normal for what your describing , if they go out,, you either have a relay problem or the switch itself is going out,
Sounds like your dimmer switch is stuck on or broken/worn out. Sometimes you can get it back by clicking your high beam switch in & out many times. If it frees up & switches back to lowbeam it will buy you time before you need to replace the dimmer switch. If not you will need to replace it right away.
There's a wiring connector located below the battery box, you can see it better from under the car. Check to see if any of the wires coming out of the connector are green from corrison, if so carefully splice in new wire(s) to repair, this is caused from the drippage from the battery tray.
the head lights have tree wires goig to it one groun one gets power when high beams on the 3rd gets power only with low beam on test the wires or try by plugin a good known head light to conector if it works with low beam then replace both head ligts because head light come with two bulbs in one high and low