I had the same problem on my 2002 Trailblazer back in summer of 2004. I noticed that my light wasn't lit up either. I took it in to the dealer and was told that my four wheel drive hadn't been working probably since the day I purchased the car (new). This alarmed me since I had just returned from a trip out Westdriving the car to the top of Pike's Peak with out four wheel drive. GM covered the cost of the repair.
When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
1- the light switch, or 2- the wiring on the plug to the light switch from the car, or 3- a blown fuse
If you brake lights are not working on your trailblazer it could be due to a number of reasons. Your fuse could be blown, or your light may no longer work.
We found the relay check lamp was the problem after replacement of vehicles stop light switch.
Have you checked the daytime running light module?
Running light does not work what is the problem
Check the brake light bulbs, Check the brake light fuse, Check the brake light switch, In that order.
Probably a faulty ignition switch. learn more at www.trailvoy.com Trailblazer enthusiasts website.
The brake light may be blown (bulb) or your brake light switch might not be working.
There is a switch that turns on the cruise control there could be a problem with that. There could also be a problem with the transmission linkage also. Causes include check engine light, vacuum hose, clock spring, brake light switch,
Depends on what the problem is. It is either, defective bulbs, brake light switch, blown fuse, or wiring problem. Check the fuse first, then if all lights including the 3rd light are not working, suspect a defective or out of adjustment brake light switch. The switch is located somewhere on the brake pedal arm, or may be a pressure switch on the master cylinder.
Problem in emission system-- Have vehicle scanned to determine the problem