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Was Cruise Control working before the New Horn was installed? The power supply to the Horn, (input to ground wire) is connected to the Cruise Control Module (CCM). This CCM is wired to the Relay Switch Box located in the Engine Bay. The Relay Box cover will have a Chart indicating what function each Relay coresponds to. Your local autoparts store (AutoZone) can test the Relay Switch, and you'll know (if any Relay) need to be replaced.
The CCM is also wired to the Steering Wheel, but first passes through the Clock Spring Coil, located just behind the Steering Wheel. The Clock Spring allowes for the Function Buttons on the Steering Wheel to have power while Steering Wheel spins.
The Clock Spring can malfunction or break, its rare, but this will cut power to the Function Buttons on Steering Wheel. If ALL the buttons on Steering Wheel dont work, then the Clock Spring is the Culprit. The Coil may need to be replaced.
The Cruise Control Module itself may have failed and also would cause a few or all Steering Wheel Functions to quit working.
But first check the Relay Switch Box and examine the Harness Cables connecting (Steering Wheel--to--CCM--to--Relay Switch Box--to--Battery Supply).
Also if Cruise Control was working before the new Horn was installed and now not working, then most likely the Problem is a bad wire connection somewhere and/or is a faulty Relay.
It's not a fuse , the SJB - smart junction box controls these lights ! This is fords body control module . If the Heater / A/C control panel ,hazard switch ,headlamp switch , message center switch all work, it is not a fuse . The gear shifter I would say the bulb is burnt out . The steering wheel lights could be out because of an open in the clock spring . The clock spring is a device inside the steering column under the steering wheel that keeps your horn , cruise control , radio buttons etc... connected electrically . How cars clock spring works
Try from Servo control follow connection To I beleive Transmission casing . Look for Burnt wiring / frayed / damaged ...Cruise should maintain speed signal Like speedo cable . Computor management black box / ECM may have direct control so Look for engine bay fuse boxes = 2 under hood . More fuses ++ relays 2 check inside cover is diagram of size + what it controls . A Reset 2 ecm may help by disconnecting Battery - Let sit 30 mins.. Older models + 4 wheel drive Trans has Gear wheel of plastic 2 count revolutions as speedo cable does . If said wheel teeth have worn out then Cruise counts incorrect or fails 2 activate . If you replaced brake pedal Light activation switch then be sure brake Tail lights DO work if not the cruise will fail as brake pedal is part of safety feature to turn it off in emergency disconnect . The signal light Stalk that Turns off L / R signals is Common Item 2 wear out BUT it also controls Turning on cruise or setting ...IF you have Steering wheel on / off / setting control - then issue can be frayed / cut wires due 2 steering wheel movement ....solutions remove wheel BUT 1 st disconnect Air Bag Fuse then wheel and search connections .....Good Luck ...
TO REMOVE CRUISE CONTROL SWITCH. FIRST TURN OFF RADIO TO KEEP FROM LOSING CODE. DISARM AIRBAG IN THE STEERING WHEEL BY REMOVING NEGATIVE BATTERY CABLE WAIT 20 MINUTES FOR AIRBAG TO DISCHARGE BEFORE REMOVING AIRBAG AND HORN PAD IN STEERING WHEEL.ONCE AIRBAG IN STEERING WHEEL OUT.YOU CAN REMOVE THE CRUISE CONTROL SWITCH.BECAREFUL REMOVING AIRBAG IN STEERING WHEEL CARRY IT AWAY FROM BODY WITH AIRBAG HORN PAD POINTING UP.IF YOU DROP IT.DONT PUT IN BACK IN STEERING COULD DEPLOY ON INSTALLATION.
use a scanner to check the abs system . most of the time the abs brakes and traction control system work together. your cruise control . unit has a servo motor .in front right fender well. check the fuse and relay also the cruise control brake release switch. and the brake light switch.if all is good you have a cruise control module problems. dealer ship job.