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Non-op heated seat: big surprise found! 850 1995

Some may remember a series of posts a couple of weeks ago about my driver's seat where the heat stopped flowing. Fault tracing showed it to be the bottom cushion heat pad. I've since purchased a new pad and now have the seat removed.

Upon removing the bottom cushion fabric cover I find the old heating pad has literally burned a hole through itself and into the foam! This is rather troublesome to say the least.

So does this indicate the thermostat is not cycling off and allowing the pad to get too much current? How does one test the t-stat to ensure it's doing its job?

Do I recall correctly that the 1997 850 had a recall for seat fire problem that involved putting a relay in the circuit?

Ideas welcome....

thx
--
'94 945t; '95 854 base








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    Non-op heated seat: big surprise found! 850 1995

    Recall was also for 1996 850. I received a notification from Volvo North America.
    R/Dave F
    96 855R








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    Non-op heated seat: big surprise found! 850 1995

    DM, I own a '96 850 Turbo and had the seat heater recall performed last year. After the recall work, I guarantee that you won't have any further problem with your seat heater getting too hot. Volvo's solution is to "dumb-down" the heat so much you won't get any meaningful heat to the seat. Fred.








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      Non-op heated seat: big surprise found! 850 1995

      Fred:
      Did your '96 get covered by the recall or did you pay to have it done?

      I was under the impression that only the '97 was recalled. I'm curious what was different about the '97 wiring that exempted the non-97 models.

      In the wiring diagram I have it is labeled "95-96 850", so I suspect my 95 is/was wired the same as your '96 prior to your recall fix.

      At any rate, I got the seat back together and the wife loves the heat. Says it seems hotter than it ever was before, so much so that she had to actually turn it off, which she never had to do in the past. I guess that's good.

      Doug
      --
      '94 945t; '95 854 base








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        Non-op heated seat: big surprise found! 850 1995

        Doug, my '96 850 Turbo was covered by the seat heater recall notice. My understanding was that this recall notice was for 850 models 95-96 and 97.

        My driver's seat was not heating as well so when the recall notice was issued, I went to the dealer, found my car was covered and had the work done. My experience was that because of the fire hazard that Volvo was concerned about they actually made the seat heaters much less warm.
        When you see the wiring, etc. that was installed as a result of the recall, it's not surprising that I got little or no heat after the recall work was done.

        Based on your comments, it sounds like you have a wiring diagram and may have done the work yourself on your '95. Did you do the work yourself and how did you get more heat that before? I would be interested in knowing more since I still have a problem with little or not heat to the driver's seat.
        I have checked the wiring and the thermostat, both of which seem okay. Someone told me that I may have a broken grid in the seat that carrys the heat.

        Any thoughts or suggestions that you may have would be greatly appreciated.
        Thanks, Doug. Happy Holidays, Fred.








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          Non-op heated seat: big surprise found! 850 1995

          Hi, Fred.

          I went to Volvo's site, plugged in my VIN and it said I had no outstanding recalls for safety and/or emissions. But based on your message, I went to NHTSA.GOV and verified there is no recall for '95 and seat heater issues. I looked at '96 and there is a recall, which I've pasted below. Sounds a lot like my problem with '95.

          To answer your question, yes, I did the work myself. Once you pull the seat out of the car and bring into a warm house, it's not such bad a job. When the seat was working well (for the last 10 years), the heat was prodigious and fast, at least in comparison to my 945 and my prior 245. Wife loved it. I would say it failed quickly, sometime in November of this year.

          All I replaced was the heating pad. Now the heat is beyond belief, bordering on too much. Even the wife says she now turns it off when she's had enough, whereas in the past she'd leave it on for the duration of her drive. I've tried it and I'm leery of it, so I've asked her to use it sparingly.

          The circuit is quite simple: current goes from fuse to switch to t-stat, to bottom cushion, to back cushion, to ground. I've read that the recall put a relay in the circuit, perhaps to limit current. If you're having trouble post-recall, the relay may be the culprit. My 945 works that way: relay and no t-stat. I had a relay fail last year on that car. Replaced that and got heat back. It's decent heat, but probably 1/2 what the 850 cranks out.

          Hope this helps you out in some manner.

          Merry Christmas to all!



          Make : VOLVO Model : 850 Year : 1996
          Manufacturer : VOLVO CARS OF NA, INC.
          NHTSA CAMPAIGN ID Number : 02V314000 Recall Date : NOV 19, 2002
          Component: SEATS:FRONT ASSEMBLY:SEAT HEATER/COOLER
          Potential Number Of Units Affected : 65000
          Summary:
          ON SOME SEDANS AND STATION WAGONS EQUIPPED WITH SEAT HEATERS, IT IS POSSIBLE THAT EXCESSIVE COMPRESSION OF THE SEAT CUSHION COULD CAUSE DAMAGE TO THE ELECTRICAL WIRING OF THE SEAT HEATER.
          Consequence:
          IF THIS OCCURS, THE DAMAGE COULD RESULT IN A SHORT CIRCUIT THAT COULD CAUSE A FIRE.
          Remedy:
          DEALERS WILL DISCONNECT THE EXISTING WIRES AND INSTALL A NEW ELECTRONIC THERMOSTAT AND CABLE HARNESS. OWNER NOTIFICATION BEGAN ON FEBRUARY 19, 2003. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT VOLVO AT 1-800-458-1552.
          Notes:
          VOLVO CARS RECALL NO. 112. CUSTOMERS CAN ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S AUTO SAFETY HOTLINE AT 1-888-DASH-2-DOT (1-888-327-4236).
          --
          '94 945t; '95 854 base








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    Non-op heated seat: big surprise found! 850 1995

    Yes...there is a heated seat recall on 97 850's.
    Dealer took care of it no problem.








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      Non-op heated seat: big surprise found! 850 1995

      That's what I recall.

      I have a '95. No recall on it. I checked.
      --
      '94 945t; '95 854 base








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        Non-op heated seat: big surprise found! 850 1995

        Does it look like placing foil between the heat pad and the foam would prevent burning the foam ? Or some other type of flame proof material. Even a piece of leather under the heat pad would probably work pretty good. It would suck to come out one morning and find your car and everything in it burned up because the foam caught fire. I don't really know that the heat pad gets hot enough to start a fire anyway but I wouldn't want to have to worry about it.



        Mike
        '95 850T







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