2003 mitsubishi spyder horn dont work - 2003 Mitsubishi Eclipse Spyder

Check fuses, wiring, power.

The two relays for the front [main] wipers are part of the front ECU [engine computer] and are not serviceable separately. The front wipers are powered by a 10 amp [#22 in the relay box] battery hot fuse and a 20 amp [#18 in the junction box] & two 7.5 amp [#20 & #23 in the junction box] ignition hot fuses. The front ECU is located under the hood. It sits on top of the driver's inner fender well.

Not being smart but get a manual or youtube it. You need to remember that the air bag is located near the horn device. You can be hurt by the bag if it inflates.

Sounds like your battery is either flat, or has bad connection.

Check the brake light switch located on the brake pedal arm. Its above the pedal under the dash and has a connector with several wires attached to it. The switch is either bad, broken, or out of adjustment. If you have to step on the brake to shift out of park there is also a another switch located there as well.

disconnect battery and join the cables together for a while if that doesnt work then disconnect battery and call the breakdown truck to take it to the dealer who has the right diagnostic software to sort the problem out for you .This is not a home repair type job

Horns are pretty simple in their operation. I would more suspect a horn relay. I am not very familiar with your vehicle, but usually due to the electrical current used in the horn circuit, most manufacturers run the circuit through a relay. An easy way to eliminate your horn is to simply run a wire directly from your battery and touch on the horn contacts. The horn should sound when you touch the wires onto the horn terminals. Hope this helps.

if there is not a button, then a good **** up will get them past the clips inside

check your gas cap and reset the service engine light

Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system