Hi everyone! I recently bought a 2015 CX-5. I like it a lot, but it does have several electrical issues I need to fix. There are five different problems, and I wonder if there may be a single issue causing them all.

Backup camera - doesn’t work, though the head unit goes black when I put it into reverse. (Head unit is a new aftermarket head unit I had installed. When the original head unit was still in place, nothing happened when I put the car into reverse).

Rear license plate lights - don’t work.

Horn - doesn’t work

Outside temperature display - usually does not work (displays “- - -”), but every now and then while driving, it will start to display a temperature (usually much lower than the actual temperature).

Tire pressure sensors - the tire pressure warning light is pretty much always on. The tires are at the correct pressure and I’ve tried to reset it numerous times with no luck.

I’ve checked all the plausible fuses, and all of them look good. So, I’m guessing it’s some kind of wiring issue. Do any of you have any ideas? Is there anything in the electrical system that could fail and take out these features but leave everything else working?

thanks!

 

Just for the heck of it, I'd get the battery + alternator tested and see how they are holding up. A lot of times the battery can be funky.

 

I agree with Alex.
It's easy to do and it won't cost you anything to test them if you do it yourself and minimal cost if you have someone do it for you.