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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.
The switch is bad. The only fix is to replace your headlight/blinker switch in your steering wheel. I have been there done that. The switch is about $75 at Auto Zone if you don't have cruise control. It's $125 if you have cruise.
Hello dogjasper. Both of these issues will be caused by a part under the steering wheel called a "clockspring". This part allows the transfer of electrical energy through a plastic spring with wire leads impregnated into it. The plastic over time will crack and the wire along with it. The clockspring carries current for both the air bag and your cruise control. The steering wheel will need to be removed to access this part to be replaced.
Test and replace the clockspring. Everything you mentioned runs through it first before splitting off different paths to thier own components. It is behind the steering wheel. Remember to disconnect the battery first before making any repairs.
The problem is the coiled ribbon contact under the steering wheel (we call it the clock-spring contact) that connects the stereing wheel controls to the steering column wiring harness, this is a printed circuit that is coiled to allow the wheel to move and still have a psychical contact for the wheel switch's and the airbag, anyway replace that contact coil, u must disarm the airbag to do this repair, follow the factory procedure to do this or serious injury can result if the airbag fires.
it sounds like you got 2 problems...the cruise and radio buttons sound like a bad clockspring......the overhead console problem sounds like a bad ambient temp sensor located behind the grill. if it is too cold out the ac will not run