Where is the fuse or relay for horn located?

Hi,

The horn circuit is powered by the totally integrated power module (TIPM). Integral to the TIPM is a printed circuit board that powers the horns. We may have a connection issue with the TIPM or there could be an issue with a module. The signal from the horn button is sent via computer data lines to actuate the TIPM.

Because the TIPM isn't an inexpensive part, I would recommend scanning the can-bus system to see if there is a fault code related. CAN stands for controller area network. Basically, the different modules are tied together via a few wires. This will retrieve codes regardless of the module storing them.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Also, I attached the wiring schematic for the horn circuit. Note that the horn signal runs through the clock spring in the steering column. That may have failed as well. Is the airbag light staying on by chance? Is anything other not working?

Let me know.

Take care,

joe

See pics below. Note: I had to cut the pic in two to make it readable. I did overlap the two so you can follow from one to the next.

Hi,

There isn't a fuse. The horn is controlled by PCB (printed circuit board) integral to the totally integrated power module. The PCB is what controls horn operation.

If you look below, the PCB receives power directly from the battery. The horn receives a path to ground at all times through its wire harness connection to an eyelet terminal secured to the body sheet metal and receives battery feed from an output of the Totally Integrated Power Module (TIPM) through a high-side driver.

If you look below (pic 2), that is the entire circuit for the horns. Note there are no fuses or relays. At this point, we need to determine if power is being provided via the TIPM or if there is a breakdown in communication via the can-bus. I would recommend starting with the scan to see if there are codes stored in the relevant modules. The TIPM is the under-hood fuse box, If you remove it, you will find multiple wires and connectors.

Let me know your thoughts.

Take care,

Joe

See pics below.