Highlander Fog Sensor Electrical Issues

I'm having a weird issue with my 2005 Toyota Highlander, gasoline engine. The error memory says there's a fault with the fog sensor. Now the AC won't turn on, the windshield washer nozzles are frozen even when it's not that cold, and the mirror heating doesn't work. Could a bad cable or plug on the fog sensor really cause all this?

4 comment(s)

Wow, sounds familiar! I've got a Highlander too, and I had some seriously weird electrical gremlins that sounds kinda like what you are dealing with. Have you checked the fuses and relays related to the climate control and mirror heating? It might be something simple like a blown fuse causing all these seemingly unrelated issues.

Thanks for the quick reply! I did check the fuses, but maybe not well enough. Can you tell me which specific fuses and relays I should check? Did you find any diagrams or resources helpful when you fixed your similar issue?

Alright, digging back into my memory...it's like trying to remember which wire goes where on a Christmas tree! Honestly, I chased my tail for a bit, checking diagrams and relays. While those resources are helpful, in the end, I decided it was above my pay grade. I would suggest you bite the bullet and take it to a workshop, they can find the root cause of it.

Understood, your experience confirms my suspicion that this might be beyond a simple DIY fix. I appreciate the advice and will schedule an appointment with a reputable workshop. The estimated repair cost is around 95€, which seems reasonable given the scope of the problem. Thanks again!

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