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Hello. It seems your Chevrolet has either faulty headlamp relay(s) or its headlamps are connected in series; if one don't light, neither will the other one. I can't explain why the 'CHECK ENGINE' light was still on while your truck's engine was off and key was out of ignition switch. Good luck and keep me informed; if you want to.
Head light have two relays.one for daytime and one for normal night. the daytime switching the light to serial circuit and if one bulb is out down both Leigh quit working. Inspect your light high and low beam for normal operation . Inspect your fuses . Swap the daytime relay with identical one.and under the dash is module for daytime running light. inspect the red/black wire for ground from light switch and light blue/ yellow for power from 15A ECU-B fuse
good luck
is usually caused by the diode for the daytime running lights goin bad,its located under the drivers side of the dash to the right of the steering column,its a square aluminum heat sink(usually black) about 3" wide with just a small 2 wire plug goin to it,hope this helps
You may have a broken or corroded wire, pull open the wire loom that protects the main lighting wire harness behind and around the drivers side headlight area under the hood. There are splices that are known to trap water in them and short out or turn green. Let me know if you need more clarification?
although the underhood relay panel is common, I'd check your headlamp bulbs first, these are cheaper than the fuse box. The daytime running lights work off the high beam circuit, thus, a blown highbeam bulb could be the culprit, the fusebox solution was more common on 2001 and up modles, although it's a definite possibility.
the daytime running lamps are the high beam bulbs connected in a series which puts a lower voltage to them causing them to appear dimmer. if your low beams are not working i'd start by checking the bulbs to make sure they're not just burnt out. then check the fuses. if that doesnt work let me know and i'll help you trouble shoot it further
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