My car radio dash lights horn and tail lights not working at all

you will have to look at an electrical diagram, but there is probably a jumper built into the stock radio that will have to be put back in.

What all did you disconnect ? Did you disconnect any connectors to the BCM - body control module ? All the thing's your having troubles with are controlled by the BCM . The wiper switch is an input to the BCM , the BCM controls the wipers by energizing two different relays . wiper on relay & wiper high low relay .

Since horn didn't work, tried to take off dash ???? Why ? didn't need to do that . Do you know what a relay is ? Horn relay is located in the under hood fuse / relay box . You could have tested right at the relay base - where it plugs in .
VEHICLE RELAYS Operation Diagnosis

Running lights, marker lights, and dash lights all come from the park light switch of the head light switch. So, possibly you need a new headlight switch. Or, if you have a voltmeter, you can do some testing of circuits to see where power is and where lost. Also check the fuse for tail lights and horn.

The fuse for the horn can not make it blow.only a bad horn switch/button can do that.The tail light fuse should be marked in the fuse panel.If you have the vehicle manual you can most likely find it in there.

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: diyobd2.fr

short probably in the radio. if it is after market radio there is bare wires some were some radios like kenwood when shorted just need to disconnect the power like your key on/off and it will reset

check that all the globs in the tail and front lights are all making good contact, then check all fuses....

Dash circuit is open internally could you tap on it to make it turn on

Often times the tail lights and dash lights are powered by the same fuse. The reason for this was so you would know that your tail lights weren't working if you didn't have any dash lights. I would look for a fuse that says "Tail" or "Courtesy". Your owners manual should have an illustration of the fuse panel and what circuits they power. Good luck, hope this helps!

you have to check all fuses with a test light both fuse boxes under hood and under dash... if good next to look for is the light switch itself... has any radio work been done to the lately... if so alot of times hooked up wrong will blow park fuse as one of the wires to radio is the park voltage to tell radio to dim down some