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Power Mirrir Switches 900

posted by  tedv on  Sat Sep 29 14:04 CST 2012
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last visit: Sat Oct 18 10:51 CST 2014
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Had a Right Rear window switch (the one in the front door switch pack) inop, so I changed the whole switch pack, and the window is fine.

BUT, the mirrors switches now only operate the mirrors UP and DOWN, i.e. I lost the LEFT/RIGHT adjustments. I thought that the mirror switches on that switch pack must be faulty so I put another whole switch pack and still, only UP/DOWN control, BTW when I operate the switches LEFT/RIGHT they still move the mirrors UP/DOWN only. Then I changed just the mirror switches, SAME RESULT! I now have only UP and DOWN, and I am pretty baffled...








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    Power Mirrir Switches 900

    posted by  Steve on  Sat Sep 29 17:09 CST 2012
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    last visit: Fri Oct 24 07:16 CST 2014
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    Sounds like a wiring problem. have you traced the wiring to the mirror motor?
    --
    See the 700/900 "FAQ" at the menu bar top screen left side.








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      Power Mirrir Switches 900

      posted by  tedv on  Sat Sep 29 19:12 CST 2012
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      last visit: Sat Oct 18 10:51 CST 2014
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      They get power just fine... They BOTH adjust UP and Down but NOT side to side. Both switches act the same--they move the mirrors up and down only, even when the switches are moved side to side.








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        Power Mirrir Switches 900

        posted by  Steve on  Sun Sep 30 09:06 CST 2012
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        last visit: Fri Oct 24 07:16 CST 2014
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        I agree with Spook on the corrosion or connector issue. Remove the switch panel and simulate the switch action by applying G and +12V to the connector to see if the mirrors move.
        --
        See the 700/900 "FAQ" at the menu bar top screen left side.








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        Power Mirrir Switches 900

        posted by  spook on  Sun Sep 30 08:13 CST 2012
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        last visit: Fri Oct 24 08:06 CST 2014
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        Dear tedv,

        Hope you're well. A conclusion could be coincidental switch failure: both mirror switches on both switch units are not working.

        I suspect corrosion on the wiring harness contacts, into which slide the mirror switch pins.

        The corrosion layer may be only a few atom thick, and so invisible. Clean the contacts - on the switches and on the harness - with an aerosol corrosion-removed, e.g., DeoxIT.

        If use of a corrosion-remover does not restore fully control of the mirrors, then I'd seek yet another master switch unit, preferably one tested and "known good".

        Hope this helps.

        Yours faithfully,

        Spook








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          Power Mirrir Switches 900

          posted by  tedv on  Sun Sep 30 17:00 CST 2012
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          last visit: Sat Oct 18 10:51 CST 2014
          [RELATED]

          Thanks for the replies!

          After some considerable switch swapping, both whole packs and just individual mirror switches, I finally opted to put back the original switch pack (after replacing the bad RR switch). Now ALL is WELL with the mirrors movements!

          But I am not totally content because this exercise makes no sense--I always believed that all the switch packs on 740/940 were interchangeable which this experience seems to disprove. I have a box with switches, may be 10, that I have collected over the years and swapping them willy nilly is apparently not the way to go. But for the life of me I see no discernible differences... Oh, well!








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            Power Mirror Switches 900

            posted by  spook on  Sun Sep 30 17:18 CST 2012
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            last visit: Fri Oct 24 08:06 CST 2014
            [RELATED]

            Dear tedv,

            Hope you're well. The driver's door window/mirror switches are not entirely interchangeable. Some early switch units don't allow for power mirrors. The 1994 and 1995 switches have a built-in "light" (which is cosmetic in nature; such units will fit into earlier cars).

            The balance of likelihoods is that the contacts on the two substitute switch units - and/or on the harness - were corroded or otherwise faulty. Witnesseth, when you put back the original unit - which worked, apart from a failed window switch - full mirror function was restored.

            It is to avoid such situations, that I test used parts prior to need - i.e., when everything is in good order - and so mark a sound used part. When I install that "marked" used part, I can be pretty sure that it should work normally.

            Hope this helps.

            Yours faithfully,

            Spook







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