1996 850 Seat Heater Not Working - No Thermostat?

kimthepilot · Post by **kimthepilot** » 14 Oct 2015, 16:28

Hi All,

Winter is coming, and I'm finally getting around to troubleshooting my heated seats. The passenger's side works fine, but the drivers side does not. I've read through this thread: https://www.matthewsvolvosite.com/forums ... =1&t=24633

Everything checks so far. I have power going to the seat. What I don't seem to have is thermostats... I took a look on the passenger's side, and it doesn't have one either. My wiring looks a little different from whats in the thread above. Any thoughts on continuing to troubleshoot this system? Has anyone else seen this before (I'm hoping yes).

Thanks for the help!

Pics:

kimthepilot · Post by **kimthepilot** » 14 Oct 2015, 16:33

Oh. Here's a third pic showing the entire bottom of the seat. As you can see, no thermostat...

Post by **scot850** » 14 Oct 2015, 17:01

It looks to me like the wiring to the seat base is missing. Hard to tell as it should go into the 'cone' in the bottom of the seat foam directly under the horizontal bar in your 3rd picture. These break off with age and seat movement and the seat heater stops working. Let me know if there is any wires to that point. I replaced the heated seat unit on my old 93 850. Took a fair amount of time, a lot of swearing and hog ring pliers and rings.

Neil.

Post by **Ozark Lee** » 14 Oct 2015, 19:06

The thermostat is in the black box under the seat. It was a recall modification on many of the cars but I'm not sure exactly which ones (model year and trim) were recalled.

...Lee