Sienna Automatic Temperature Control Failure

Interesting. I have a Sienna, too. Sounds like when my climate control went bonkers. It was like the van thought it was winter in July. Have you checked the basics like fuses? I'd start there before diving into sensors.

Thanks. I have checked the fuses; they're fine. Could you tell me more about the specific symptoms you experienced with your Sienna's climate control?

Well, mine was stuck on full heat no matter what I set it to. Figured it was possessed. Since you've checked the fuses, and if the computer is throwing codes about the sensor, it does sound like a wiring issue. Honestly, after poking around a bit, I just took mine to the shop. Sometimes it's better to throw money at the problem than to get completely frustrated, you know? Especially with those tiny wires.

Thanks for the advice. A visit to the workshop was needed. The diagnostic pointed to a faulty connection which they repaired for 95€.