Question about Infiniti FX35
No the window regulator is not going bad in most cases, but to make a final determination of what the cause is, answer this, does the window make any attempt to roll up? if not then the switch is defective, if it does try to move lubricate the window channel's with dry Graphite spray and see if that eases the roll up problem.
Posted on Mar 25, 2011
It is either the regulator ,the motor ,or the switch. I would start by disconnecting the wires from the motor(have to remove the door panel) and verifying continuity between the two wires of the window motor connector, with the switch in the up and down position. As long as their is good continuity then I would replace the motor/regulator. Typically if it is the regulator you can hear the motor trying to turn. If it is not even trying then I would suspect the motor.
Posted on Mar 25, 2011
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Posted on Jan 02, 2017
I just repaired a 1999 Corolla (160,000 miles) window regulator with the same problem. I checked the motor commutator windings for shorts and the motor was OK. The brushes were still good. The motor is built like a clock - extremely well made with almost no indication of wear. Bench testing showed that the motor would not rotate once it had been run for a few seconds.
Elsewhere on the Internet someone mentioned a PTC Thermistor. This was exactly what was causing the problem. This is a special type of resistor "in series" with the motor that increases resistance when hot. It prevents the motor from drawing much current when stalled at the top or bottom of the window travel or in event of a jam, etc. The thermistor doesn't look like a standard "Radio Shack" part. By pulling off the motor top the magnets and commutator pull out. The PTC Thermistor is the two large copper plates separated by a silver looking material about 0.001" thick that are in series with one of the brushes. To fix, short out the thermistor. I tested with a small clip of copper wire. I made a permanent fix by soldering a jumper from one plate to another. During assembly, don't break the brushes.
The power window works great! I don't need an "electronic minder" to stop power to the motor at the top or bottom of the travel; I can do that. I don't intend to place my head in the window and push the button. If you have kids, this fix might not be for you.
Posted on May 31, 2009
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