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1998 V70 Driver Seat Control and Motor Problems V70-XC70

posted by  BrandonD on  Tue Jan 5 10:52 CST 2010
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last visit: Mon Sep 19 09:09 CST 2011
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I AM STUMPED. My beautiful 1998 v70 2.4L joy (with 115k) has a driver seat motor problem.

The driver seat control, control board, motors are not working. I've confirmed that all 16 pins on the control unit are working. Proper Voltages, Proper Function when activated (i.e. voltage drop). I hear "clicking" within the control board. I have checked all ground wires for continuity with the chassis. Yet with any of the funtions (seat forward/back; backrest up/down; rear edge, back edge, memory, etc), all I get is "clicking in the board". I've tried (3) other boards: one was from a 1996 850 (same connectors and functions and control unit, but a few different internal components (i.e. switch models)), and today I went to a dismantler that I trust (for parts on my '92 940gl) and he loaned me a functioning control unit and control board. I know that it was functioning because as luck would have it he was installing into 1998 V70 T5 - the seat was tilted but grounded and I watched the functions work. We tried the two components on my car and still the same clicking in the control unit.

I have 12.35 volts at the one Red/Yellow lead into the control board (this same connector has a couple ground wires all grounded).

Can anyone help please? I'm thoroughly frustrated with a car that I








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    1998 V70 Driver Seat Control and Motor Problems V70-XC70

    posted by  BrandonD on  Tue Jan 5 15:30 CST 2010
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    last visit: Mon Sep 19 09:09 CST 2011
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    GREAT - the minute I join and post my first Brickboard message I have to look like a knucklehead. The problem was two fold - so only half a knucklehead. Indeed my original control board went bad (since it still does not work). When it fried - it clearly pulled too much amperage through the "automatic fuses". These are accessible by removing 4 #20 torx screws around the main fuses. in the number 39 terminal for a 1998 V70 is a larger 20 amp fuse. this was blown.

    the rabbit hole of testing terminals and swapping out controls and control boards was a waste of time. I hope that someone else out there with a similar problem might avoid the same mistake - moral: if its "automatic" check both the standard fuses and the "automatic fuses".

    Oh - BY THE WAY - the control board under the seat - I'm using one off a 1995 850. The guts are a bit different but all connectors and functions are the same. So don't get suckered into a brand new part - the boards cost $10 at Pick and Pull.

    good luck!








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      1998 V70 Driver Seat Control and Motor Problems V70-XC70

      posted by  Georgeandkira on  Wed Jan 6 08:46 CST 2010
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      last visit: Tue Dec 10 17:58 CST 2013
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      Hello BrandonD, I'll take over being the knucklehead for a while. You're saying that there's an additional fuse panel under the main one? Is the main one the one under the hood? After researching trailer wiring on my V70 (happy ending) and looking at the same area (LR panel) on a friend's XC90, I feel a little overwhelmed at the amount of electric stuff in these cars. Kira








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        1998 V70 Driver Seat Control and Motor Problems V70-XC70

        posted by  BrandonD on  Wed Jan 13 04:30 CST 2010
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        last visit: Mon Sep 19 09:09 CST 2011
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        There is another set of overload fuses (4 to be exact) and a few relays. When I say "under" what I mean is...

        in the engine compartment of a 98 V70 (and others) there is a plastic flap latched over the main 30+ fuses. this flap latches to a larger plastic piece that is bolted down with (4) T25 (not T20) Torx screws. Remove these screws and you'll see (4) 20amp 12V overload fuses to the right of the main fuses. Two terminals are wired to the driver/passenger power seat motors. Another goes to power windows, sunroof, etc. You should have at least Two fuses (one for power windows & sunroof and another for drivers power seat). If your power windows work, then take the fuse out of that terminal and try it in the power seat terminal. A quick swap should tell you if your overload fuse is blown. Unlike the main fuses, you can't see the conductor that "melts" if overloaded, so its best to swap out one that you know is working (ie power windows) to check if you blew the fuse.

        good luck








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      1998 V70 Driver Seat Control and Motor Problems V70-XC70

      posted by  KlausC on  Tue Jan 5 15:38 CST 2010
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      last visit: Fri Oct 24 10:15 CST 2014
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      Half of all problems get solved by thinking more slowly. I am glad you found the other fuses for overload conditions.

      Klaus
      --
      Proud owner of a 220S. If I had more room, I would have more Volvos.







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