2003 trailblazer headlights come on randomly when vehicle is parked and switch is in off.
Replace #43 Relay under the hood. Could be malfunctioning. There's a recall for this relay also.
SOURCE: headlights wont come on, but parking lights work...i dont get it
Was sent in by another poster, just posting his results which fixed mine. Problem was relay $50.00 at GM only.
Check the relay module. 45 or 46. on the engine relay block. you can
swap the two they are the same part number, then you will know. Dont
start the engine, just check the lights. If it works replace the relay
module. You may have to order the part from the parts store. Or go to
the dealer to get it.
SOURCE: 2003 Envoy low beam headlights won't work
Both low beam head lights are burnt out? blown fuse.
SOURCE: I parked my 2003 Chevy Trailblazer in my driveway
If it is floor shift it has a soloind under the cover not to hard to remove, you have to memove the whole thing bolt in front cupholder and inside armrest storage. once it has removed there is a soloind in there that mounts on the shifter. this goes bad alot. Push the button on the silver soloind button this will release it into gear. Hope this helps. ( Usually he black soloind goes bad)
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.
SOURCE: 2003 mercury grand marquis headlights will cut out
My 2003 Mercury Grand Marquis has the same problem. We found out it was the headlight module located under the dash above the gas pedal. The black box has wire connectors coming out of the back. Hitting the box worked for a little while, then I had to reach in the back and wiggle the wire harness. The dealership wants 500.00 to replace the unit. I consider Highway Robbery! They have installed a faulty piece of equipment on my Luxury car that could easily be life threatening but we know it won't be recalled until someone dies because of it. My husband was able to remove the unit and looked it over it had two circuit boards and he was unable to visibly see any problem or loose wire. He cleaned the connectors and used some electrical terminal grease on the wires, this improved it for a short time. The problem still exsists. I have sat for 30 minutes or more waiting for them to go through the On/Off cycle till they stay on for the 45 minute ride home from work. I have beat the box with my flashlight (maglights handle the abuse, my fingers and nails don't) till it came loose from the brackets that hold it. I leave my car running while pumping gas, short shopping trips and start it 20 or 30 minutes early before leaving for work. It is frustrating and dangerous. If this is the kind of quality in our American made cars it's no wonder they needed a BailOut! The only thing we have found to "fix" it is to find a used part that could possibly have the same problem shortly down the road or pay the theives at the dealership to replace it.
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