More than likely your window motors are going out. The only way to properly diagnose them is to take the door panel off, find the connector going to the motor, backprobe BOTH wires at the same time with a 12v trest light or similar while the window switch is pushed. What you're doing is making sure that there is both power and ground at the motor (just checking for power isn't enough). If there is power and ground at the motor when you push the switch up and down, then you have a bad motor......
Problem: power window does not always move when switch is pressed.
Solution: the switch contacts needed cleaning, as the previous posting suggested.
How to remove: Remove switch panel from the center console by prying
from the back and then the front. There are two snap features at each
end that hold it in to the center console.
Unplug the two wiring harness connectors by releasing their respective latches.
Separate the window switch housing from the panel by releasing a
set of four snap features. A small flat-blade screwdriver is handy
here. Note the dove-tail features centered between each side pair of
snaps. You will need to insure proper engagement of the dove-tails when
you reassemble.
The bottom of the switch housing is then removed by releasing four more snap features.
The circuit board and switch contact assembly is inside and is
removed by releasing yet four more snap features. Caution: once this
assembly is unsnapped from inside the housing, the switch contacts for
all the switches become loose and will fall out when the contact
assembly is removed from the housing. That is OK, but do not loose the
small metal pieces!
Clean all the contact surfaces that show signs of electrical
arcing: the posts in the assembly and the individual contact pieces
that fell out. I used a small abrasive stone to shine them up.
Reassembly:
Holding the contact assembly in its upright position, set all the small
contact pieces in their respective locations by engaging their middle
side notches with the small plastic tabs in the assembly. With all the
loose contacts set in place, keep the assembly upright and carefully
insert the assembly into the switch housing until it is snapped into
place.
Then snap the housing's bottom cover into place.
Snap the complete housing into the panel, making sure the dove-tail
features are engaged.
If they are not, the four snap features will not stay engaged. You may
have to remove the power mirror switch housing (held by two snaps) to
allow you to squeeze the dovetails together while you insert the
housing.
Reconnect the two wiring harness connectors.
Snap the panel into the console.
That's it.
Electrical switch's contact for up movement must be cleaned.
Power window mechanism gear worn.
Check also the harness and the connector.Door side panel must be removed to have access.
Motor check
Connect the motor terminals directly to the battery and check that the motor operates smoothly. Next, reverse the polarity and check that the motor operates smoothly in the reverse direction. If the operation is abnormal, replace the motor.
Relay check
1.
Check the continuity between terminals "3" and "5" with an ohmmeter.
2.
Apply DC 12V to terminal "3" and ground terminal "5".
3.
Check for continuity between terminals "1" and "2".
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Relay check
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