Originally Posted by dpivarnick
Thanks fellow forum followers for your feedback on past questions. I am having problems with the horn system on my '94 C4. I took it in to the dealer and he diagnosed the problem as having to replace the horns, horn contacts and turn signal canceling cam. I didn't quite understand why the canceling cam needed to be replaced as turn signals work fine. Does it hold in parts of the wiring for the horn contacts? Any advice would be appreciated.
It would seem nearly impossible to need "all of it"! The cancelling cam has a brass ring on it that is used to initiate contact with the harness and buttons. It has a nylon "tower" that the horn contact is attached to with a twist lock feature.
The horns can be checked with just a 12V source but the '94+ do have issues with the horn contacts. There are reproduction horn contacts from several vendors and they're on eBay frequently. $55 or so will buy the contacts, I'd say as long as you're doing the contacts the cancelling cam might as well be done also. Is it broken? until it's inspected you can't tell.
If you're one to attempt your own repairs (doesn't sound like you are) there are threads I'm sure with the procedure. I'd think you need to think twice about the recommended repairs. Have you already been charged the diagnostics?
In this post there's a very good image of the horn contacts and you can see why they're likely needed. On the left side of the part you can see the "black" connector that actually twist locks into the cancelling cam to make the contact with the brass ring on the cam.
The cancelling cam connection is at about 11 o'clock in the second image. The air bag needs removed to inspect.