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Old 12-24-2020, 08:18 PM #1
pierce.martin pierce.martin is offline
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Parasitic Draw Driver Power Window

Hi everyone,

I have a 2000 4runner that I am trying to chase down an intermittent parasitic power draw on.

I have installed a current monitor on the battery and tracked the parasitic load down to the "POWER" fuse on the cabin fuse box which I think goes to the power windows/locks/etc...

I have always had an intermittent issue with the driver power window where sometimes if I bang on the door enough it will start working again. Sure enough, after installing the current monitor, when the parasitic power draw is present the driver window won't work. If I bang on the door enough, the window will start to work again and the power draw will go away.

Does this point more to the switch or the motor itself? I have taken the switch assembly out and all the wires/connectors/circuit-boards look in great shape with nothing obviously wrong. Is there anything I can test?

Thanks in advance for any advice you can provide!
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Old 12-24-2020, 08:30 PM #2
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Check the wires in door jam boot and see what you find out.

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Old 12-25-2020, 11:41 AM #3
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Try unplugging the window motor when in parasitic drain. If it clears, motor is likely the issue. If not, it's definitely the switch or wiring. I agree...check the wires in the door harness to body connection where they flex. Common fail point.
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Old 12-25-2020, 02:14 PM #4
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Thanks guys!

Good advice, now to tear into the door to get to the motor. Will check the door connection as well.
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