There is no dedicated fuse for speedometer only. There is voltage and ground for the instrument cluster.
The vehicle speed sensor sends a signal to pcm concerning speed then the pcm sends signal to instrument cluster for speedometer.
SOURCE: O.B.D. FUSE 2003 CHEVY 1500
Underhood fuse box (behind battery). may be labeled cigarette lighter or "aux pwr".
SOURCE: 2003 Chevy Trailblazer my AC blower won't turn off!
you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground
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: Where is the fuel filter located on a 2003 chevy
Located in the fuel tank and can be reached by removing the back seat.
Good luck.
SOURCE: 2004 chevy trailblazer fuse box diagrams
I have front and rear a/c. The air is blowing in the back but not in the front. Don I have 2 blowers/units. Could this be a fuse?
Sounds like a bad speedometer sensor. Usually located on the transmission. The only way to fix the speedometer is to replace the sensor.
The Variable Speed Sensor (VSS) has failed. You will have to get it replaced. Both are driven by an electrical signal sent to the cars computer by the VSS, and converted to SPEED, and DISTANCE driven.
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