Can anyone advise where I can get a wiring diagram for CX9? Issue is that the horn stopped working (both when pressing steering wheel as well as key fob alarm). Husband has:
1. Replaced fuse, replaced horn, replaced relay - no change, still not working.
2. Checked voltage at relay, both relay coil and contactor side have power.
3. Relay works but still no power to horn.
Does the horn power go through another component? Alarm, airbags? Immediately before the horn stopped working, the alarm went off in the garage (for no apparent reason), so maybe this was a clue as to what triggered the failure? Husband said maybe if he has a wiring diagram he can troubleshoot further.

Trying to figure out/fix on our own before taking to dealership. Car is barely out of warranty (took delivery in 2021 and currently less than 36,000 miles). Thanks for any help!

 

Check horn side (not relay side) ground and power, there must be open circuit somewhere.