How to replace headlight switch 2005 colorado

Call any dealership, they have to tell you truthfully if so

every time you disconnect the battery you corrupt the CPU program in the ECM
try using a scanner to reset the ECM

Blown head light globe.

possibly bad headlamp switch.

First you have to make sure the bulbs are good, if they are check out good, you need to check the fuses and switch.
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New Slim hid ballast

Is it possible the switch is not adjusted correctly ?
Are you getting power in and out of the switch without pressing on the pedal ?

The turn signal switch. Almost all of the lights run threw this.

I AM LOOKING AT BAD WIPER SWITCH.

I have the same problem with mine. I havent fixed mine yet but what I would do is remove the grill first, which is required on most newer chevrolets, to remove the headlight. Then remove the light and let it set out in the sun, given that the outdoor temp is warm enough to evaporate all of the moisture. Then around the lip inwhich the clear lens meets the black headlight frame, line it with silicon sealer, and use a razor to trim the excess. Reinstall and should be fine.

Just a guess...its your passenger side headlight that has the moisture, because ive commonly seen that on colorados including mine. Best guess as to why is because that side is near the curb when driving, therefore exposing it to the runoff water from the road.