What could be the problem/fix for 2003 chevy trailblazer which is accelarating on its own?

SOURCE: head light bulb replacement 2003 chevy trailblazer

Simple! (I have the same model as well) Pop off the front chevy grill - it's held on with spring clips. Then look at the headlight assembly - there are 2 slide clips on either side, near the top - they have a tab that is bent forward - lift them UP. It may take a little force as they are usually stiff. The headlight assembly can then be pulled off the car, and the bulbs replaced.

SOURCE: need help for rear tail light assembly on my 2003 trailblazer

CHEVROLET HAS A SPECIAL POLICY OUT FOR THE TAIL LAMP ISSUE. THEY WILL REPLACE THE CIRCUIT BOARD IF THE PART NUMBER IS NOT CORRECT. THE NEW NUMBER IS P/N 16532713 IT IS PRINTED ON THE CIRCUIT BOARD.

SOURCE: 2003 trailblazer low beam headlights go out

Check your dimmer switch on your steering column. Your plug may be loose or not getting a good connection. Your dimmer switch may be going bad as well. The same thing happened on my 1994 Chevy, but the lights never came back on, on mine. I found that the dimmer switch had gone bad. If this is the case, I recommend buying one from your local chevy dealer and spending the extra money. I went through two that I bought through napa before buying a OEM replacement because the napa ones just didn't last.

SOURCE: I have a 2003 Chevy Trailblazer and recently

It is probably a relay clicking that is going to go out in the near future. If you have a problem with the chevy down the road, first thing to do is check your relays under the dash with a cheapo ohmmeter or muti-tester and check for resistance

SOURCE: replace low beam headlight on 2003 chevy trailblazer

I just replaced the low-beam bulb on my 2003 Chevy Trailblazer. The grill just needs to be loosed slightly. Then, raise two L shaped brackets, one on each side. For the inside one, I needed to use a flathead screwdriver to get to it. The light assembly can then be pulled out. Remove the rubber cover and rotate the bulb one quarter turn left to release it. Pull out the bulb, replace with a new one ($11.50) from Advance Auto Parts, and reverse the process. Once I figured it out, took about 10 minutes total.