Seat Leon Mirror Heating Issue

Ah, sounds familiar! I've got a Seat Leon, too. Had a similar problem with my car mirror a while back. Mirror heating suddenly stopped working, and the error memory was showing something similar. Did you check the fuses? Sometimes it's just a blown fuse. Also, have you tested the voltage at the mirror connector itself? You'll need a multimeter for that, of course. That can at least tell you if power is getting to the mirror. It's surprisingly common for the wires in the door hinge area to break due to constant bending.

Thanks for the quick reply! I didn't check the voltage at the mirror connector, to be honest. Where exactly is the mirror connector located, and is it difficult to access? Also, how would I go about testing the voltage with a multimeter? I've got one lying around somewhere, but I'm not really sure how to use it for this purpose.

Yep, sounds like the same gremlin I had. Honestly, messing with the mirror connector can be a pain if you're not comfortable with car electrics. You have to carefully pry off the mirror glass without breaking it (plenty of YouTube videos on that!), and the connector is usually tucked away inside the mirror housing. As for the multimeter, you'd set it to measure DC voltage, then probe the connector pins while the mirror heating is switched on. If you're not seeing around 12V, then the problem is upstream. Given that there's an error code stored, and you're not super familiar with this stuff, my advice would be to bite the bullet and take it to a workshop. 95€ isn't too bad, and at least you'll have peace of mind knowing it's fixed properly. Plus, you avoid potentially damaging the mirror or the car's electrics. Just my two cents!

Took it to the workshop, and they found a defective plug connection as suspected. Repair cost was 95€. Now the mirror heating is working again, vehicle safety is improved, especially with winter driving just around the corner!