Question about 1990 Nissan 300ZX

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Power windows don't work at all for my 1990 Nissan 300ZX 2+2 Can anyone tell me how to check the fuse? I don't have the kick panel for the fuse box, and I don't think the fuse for the power windows is in the fuse box by my left foot anyway. OR any other ideas how to troubleshoot the problem source? Thanks, RW

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  • wsm38 Apr 19, 2009

    My neighbor just came by with a test light. The fuse is DEFINITELY
    good since the power seats are working. However, there is apparently NO power getting to the switch (orange wire) friend thinks it is the amplifier/relay whatever in the door that is not feeding power to the switch. Do you concur/agree/disagree/whatever?

    Oh!, my friend also ran a power wire directly from the battery to the switch, and we heard something, but still no power coming through.
    He suspects it is the amplifier, as do I as well.
    Please lemme know what ya' thing.


  • Mike Butler
    Mike Butler May 11, 2010

    Tell him not to forget those motors run up & down by reversing polarity in the switch. he should know what I'm getting at.

  • Mike Butler
    Mike Butler May 11, 2010

    Probe/poke, wires in door jamb loom for power with 12v test light or voltmeter. If there's power there to heavier gauge wire, then problem at door switch. If you can get door switch out and test there, is even better.


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Check fuses first... that is a quick, easy, and very possible problem and luckily it isn't hard to do.
grab a volt meter or DMM and check to see if you have voltage coming in and then as you press check voltage on the rest of the plug on the switches. if you have nothing here is what i recommend.
remove the actual master switch and carefully take it apart down to the actual contacts (before very cautious not to break any of the plastic clips and watch for springs and small rollers inside the switch). look for carbon build up on the switch contacts and gently clean them with a small piece of fine grit sand paper. once all contacts are clean put everything back together and plug back into vehicle to test. repeat same process for passenger side if you are having issues on that side as well.
this is a standard process i go through anytime i buy an older vehicle.

Posted on Aug 18, 2009

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