Does power window motor or regulator cause this issue?

Before you go through all of the time and hassle of swapping motors and regulators, try just replacing the switch.

I recently broke my 94 Corolla's power window switch, so I grabbed a junkyard replacement. The window would go down fine but it was going up slowly and in little jumps if it was going up at all.

I swapped in another switch-bank I had pulled and the window is functioning perfectly again.

zzyzzx said:

When I did it I unplugged the motor from the harness and manually powered it and it worked just as bad. That's how I tested it. The new one has worked perfectly ever since. There cars have crappy window motors from the factory.

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I'm all for bench testing components when possible, but few people have access to a suitable 12v power supply or the skills to test something without it being installed.

The switch bank can be swapped without even unscrewing anything most of the time. Flee-bay sells new replacements for about $20. My local LKQ junkyard charges $19.99 for the master power switch bank.

Worst case, if it's not the switch, bring it back to the junkyard and apply it towards a replacement regulator or motor.

Also, I'm a huge fan of eliminating the easy variables before going after the harder ones.

ToyotaRIMD said:

This issue with Passenger side front window. If it is an issue with switch, it should work with one of the switch (1- One at driver door, 2-One at Passenger front door). In my case I have the same issue with both switches.

Do you suggest, both switches need replacement?

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Wow, nope, odds on both switches failing are slim.

And I totally get it, most of us have a battery in the car, but I still maintain that few people can pull a part out of their car and correctly attach it to the car battery to test if it's working.

More power to you, zzyzzx, as you seem capable, but I have no real idea how to pull my power window motor out of the door and hook it up to the battery directly. I'd be really surprised if more than a handful of people here can too.