1992 Scorpio interior lights & horn working but no ignition at all

In the fuse box under the hood or in a box behind glove box.

Check relays

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

What year is the vehicle ?

check your ground wire from battery to fram take it off at frame and clean the frame then put wires back on this is a common prob with honda accords

BTN stands for Body/Tail/iNterior. It protects the HAZARD, ANTENNA, ROOM, STOP, ILLUM and ABS fuses in the cabin fuse box, which in turn protect the hazard lights, antenna, ECU memory, brake lights, tail lights, ABS, power locks, clock, horn, illumination, stereo, HVAC, interior lights and alarm. __________________

fuse is blown

inside the steering column locate the ignition remove wire to reveal screw to remove ignition that wire is what controls the buzzer and light itthe wire probrally wasnt in place correctly wich caused your problem

horn and dome on same circuit check fuse for voltage on both sides on your stereo you could hook to an ignition terminal in ur fuse box

There is a switch either in or on the driver door that turns on the interior lights and tells the module the door is open and the key is still in the ignition, this sounds the alarm, check all the doors and make sure they turn the interior lights on and off when the doors are opened and closed.