I assume you meant "connected backwards". That can do all kinds of unknown damage to computers and modules. Start out checking the main maxi-fuses and any fusible links if it has any.
Testimonial: "I have changed one relay already, but nothing still. The car started when we touched the starter but the lights never came on and it won't start or do any thing with the key"
SOURCE: 2001 honda civic ex
if its a standard check the clutch pedal switch if its an auto check the neutral safety switch and check the fuse in the fusebox that says CRANK
SOURCE: the car won't start; lights,
Check the starter and the starter relay or fuse. A client of mines car was doing the same thing, it ended up being two issues, the starter not working anymore, and a relay that was bad. If I am not mistaken everything should be labeled in the fuse box under the hood and will tell you where the fuse/ relay is for your vehicle
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