Radio and horn will not work

you need to locate the right fuse box to start with most are under the bonnet in the motor department or behind the kick panels passenger side or drivers side , or a common place is under the dash and the fuses come in a flip down arrangement so you can inspect them, to identify each fuse and know what part of the electrical system that they are dedicated to can be found under the fuse box cover lid where it is imprinted so you can reference the fuse and it will say something like this ..... 25 amp lighter radio acc lights .... 15 amp indicator lights and regulator ....10 amp horn and park lights ... if you can not locate the fuse box because it is in a unusual or hard to find place , try looking it up in a manual on line for your make and model

Check for a short in the cigarette lighter. Might be a coin in it.

Go to Pennock's Fiero Forum and ask this question there. They will help you. Ask under Tech.

I do believe that your vehicle does have a fuse for the horn, if so, you should be able to locate the fuse, inside the car, on the driver's side, right under the dash. There should be a cover you can remove to access the fuses, and most manufacturers include the fuse information on the inside of this cover.

I hope this gets your horn going.

Exploded view of the horn assembly location and components

There are two horn assemblies installed at the front compartment frame rails, one on the left and the other on the right frame rail. Remove the electrical connector and retaining bolt. Note that the right and left horns have different mountingbrackets. Install the horn and torque the bolt to 12 ft. lbs. (15 Nm).


Horn Relay The horn relay is located in the convenience center on the right side of the A/C and heater module under the instrument panel. To remove the relay, pull it straight out of the center

The convenience center is a stationary unit. It is located on the right side of the heater or A/C module in the vehicle, under the instrument panel. This location provides easy access to the audio alarm, 4-way flasher, the horn relay and the seat belt key and headlamp warning alarm. All units are serviced by plug-in replacements



The convenience center is usually found on the right side of the heater or A/C module

Your fuse box is located on the driver side under the dash board. Up above where your brake and gas pedal are located. There should be a plastic cover that can be snapped off to reveal all of your fuses and on the inside of this plastic cover there should be a diagram of the fuses that are in use.

there is another fuse box under the drivers side dash left side

Did you try disconnecting wires at horn?

under hood fuse number 42 (stop, Horn)

ther should also be a relay under dash

did you install a new stereo? its an odd question but if u did i can tell you exactly what went wrong.