Horn issues

This is a bit of an odd issue but I suspect you have a short in either the clock spring or wiring on the column. So basically when you press the horn the is grounding the ignition switch and that shuts the vehicle off just like if you turned the key off.

We are going to have to start with checking voltage and shorts to ground on the run circuit of the ignition switch.

https://www.2carpros.com/articles/how-to-check-wiring

I am attaching all the info below on the wiring but I suspect you are going to have either an issue in the clock spring or the ignition switch, or the wiring has a rub through on it.

Please let us know what questions you have and we can go from there. Thanks

Okay. If you replaced the switch and this issue was there before and still there then I suspect you have a wiring issue. More then likely you have wires that are rubbed through and touching which means they are shorted together and when you press the horn it tells the PCM to shut the engine off.

The way to test this is to check the continuity between the wiring of the horn and relay to the ignition switch wiring. Just back probe each one of these wires in all combinations and set your meter on continuity or resistance and then start the engine and press the horn. You may not have to do this if they are touching all the time as if you have any continuity or resistance then that means they are touching.

Clearly you should have no continuity between them.

Let us know if you have questions on this. Thanks