About a month ago I took my JK to the dealer to replace my bad steering gear and clock spring (which was replaced twice). About a week after I picked it up I discovered my horn did not work. Searching the forum I discovered two possible causes, broken connection as a result of the clock spring replacement or a bad Totally Integrated Power Module. The dealer took a look and said it didn't have anything to do with the clock spring replacement and was a result of a bad TIPM. They were on a 6 week back order at the dealership so I searched online and found a new one myself and received it in one week. I installed it this evening and still no horn. I did pull the horn and plugged it into another JK and it worked fine. Is the dealer feeding me a line of BS so they don't have to fix what they broke? Anything else that could be keeping the horn from working? I have two more weeks to pass my safety inspection before my tags expire so I'm in a bind to get it done.

 

What year is your JK?

Listen for the horn relay in the TIPM while someone depresses the horn button. You should hear a faint click from inside the box. Put your ear on the TIPM cover if you have to. Do you hear the relay?

 

It is a 2009. I do not hear any clicking in the TIPM when press the horn button. I was looking at your old thread about checking if any voltage was going across the fuse:
https://www.jk-forum.com/forums/jk-e...-191769/page2/
Look at fuse M23, in the picture above.
Pull the M23 fuse out.
Have someone push and hold the horn button while you check for 12 volts at the pin socket closest to the pink fuse.
Have the key in RUN, as I don't recall if the horn works in Lock and ACC. As you mentioned before, you should hear the relay click.

To do this, do I just put the positive probe in the fuse socket and touch the negative probe to a ground point? If that is the correct way to do it, I have no power going to it. The TIPM purchased is new. Should M23 have power all the time or only when the horn button is pushed? If a wire in the horn button near the clock spring was not making a connection, would that result in no power at M23?

 

Yes...and have someone press the horn.

 

Also, if I set of the alarm, the lights will flash but the horn won't sound. This would lead me away from wiring near the clock spring and to an electrical issue somewhere else, no?

 

I have no idea of how the horn is wired. But from reading the stuff Ron wrote in the thread you linked, it leads me to believe it's a bad relay since the fuse is located after the relay and the relay is not clicking. But since you tried another TIPM and it still didn't work, then I would guess one of the power wires (most likely a shared power wire) that feed the TIPM for the load and/or control circuit. My next guess is the ground wire coming from the TIPM for the horn control circuit. I'm guessing the horn button switch is connected to that wire, not the positive feed. If there are 2 ways to trigger the horn, the first being the horn switch and the second being the alarm/panic circuit, and neither of them work, and both power wires are good, then I'M ASSUMING they share a common ground wire at some point which is how they're triggering the relay. It's highly unlikely that two different ground wires failed at the same time so I feel it is a safe assumption.

 

Thanks for your responses and suggestions. I don't have time to try and dissect it myself so I'm just going to take it 'm going to just take it back and let them deal with it.

 

I just got the Jeep back. Apparently the new TIPM I installed just needed to be flashed. I asked how everything else could work except for the horn and they couldn't explain why. They have learned that with other TIPMs, if one thing won't work more often than not, a simple Ctrl-Alt-Del makes everything better.