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A general electrical question

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Old Aug 7th, 2018, 23:12   #1
arcturus
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Default A general electrical question

Hi, nothing to do with amazon or PV but a general question that I know that some of you experts might answer. The front NS power window on my 940 gle will open the window but not push it back up. Does the switch just reverse the polarity of the motor to enable it to lift or lower. If it does one but not the other would it be safe to assume that the motor is OK but the fault could lie in the switch? Diagram attached
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Old Aug 8th, 2018, 01:56   #2
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Originally Posted by arcturus View Post
Does the switch just reverse the polarity of the motor to enable it to lift or lower.
That's what the diagram you posted shows them doing.

Quote:
Originally Posted by arcturus View Post
If it does one but not the other would it be safe to assume that the motor is OK but the fault could lie in the switch?
The switch or the wiring interconnecting them.
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Old Aug 8th, 2018, 02:02   #3
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arcturus;

Typically, the electric window lift motors are a DC motor (so polarity applied determines direction!), and this is consistent with your wiring diagram. If you can lower but not raise, it might be the switch, but remember that lowering is a lot easier than raising...if you set switch to raise and "help" it by hand, and it lifts OK then, it may be a matter of high friction which motor has difficulty overcoming...try cleaning/lubing track or checking that glass is not jamming...

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Old Aug 8th, 2018, 09:47   #4
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Most likely contacts in the switch. Easy to remove (just lever out the whole panel and disconnect the plugs). Try WD40 inside the offending switch or replace it.
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Old Aug 8th, 2018, 11:08   #5
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Most likely contacts in the switch. Easy to remove (just lever out the whole panel and disconnect the plugs). Try WD40 inside the offending switch or replace it.
yes the switch a lot of dust and dirt and water falls down the side of the switch over the years , you can dismantle it and clean it out .
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Old Aug 8th, 2018, 12:59   #6
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Does the O/S window work?

If so, swap the switch and see if that solves the problem. Save a lot of messing about to do this first!

I wouldn't use WD40 to clean a switch. You can get a can of dedicated electrical cleaner of ebay for a couple of quid. When it's that cheap, it seems pointless to use the wrong product.
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Old Aug 8th, 2018, 14:29   #7
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Sorted. It is the switch. Ordered a new one from ebay. only£15
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Old Aug 8th, 2018, 14:37   #8
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arcturus;

I have to agree with Faust...a temporary simple swap of switch performed first, is a very good "Divide-and-Conquer" troubleshooting technique...if Motor functions as expected (you don't have to go inside door to motor...), turn your attentions to the offending switch...often the "NS" (I believe you use the term Near Side...here in the colonies, we would say Driver's Side), obviously gets many times more use than the "OS" (Off Side...we would call this the Passenger Side)...it wouldn't be the first time the NS simply wore out before the OS, actually it is quite common...so simply swapping the switch mechanics (if possible) might be an effective, yet inexpensive repair. Repair of the offending contacts of the failed switch may also be possible OR simply make that the switch controlling window behind driver (least used!).
I can't endorse using WD as any kind of treatment other than a flush, as it leaves very little behind long-term and that is what what is called for here...lube with dielectric grease (which lubes the mechanism without shorting contacts).

Edit after seeing arturus's posting; OR you can order and install a new switch when you confirm it to be the culprit and find it to be reasonably priced...

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Old Aug 9th, 2018, 23:49   #9
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A long time ago I had run out of contact cleaner so I tried to clean a crackly pot with WD40. It completely ruined it, and I've never put WD40 anywhere near contacts since.
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