rear passenger window on 2002 Cadillac Seville STS

my rear passenger window wont roll up it happened once before but a couple days later it rolled but now it wont go up and its been about two weeks any suggestions?

Asked by for the 2002 Cadillac Seville STS
Windows fail due to the following:

-faulty motor
-faulty regulator
-faulty swtich
-faulty wiring
-chafed glass runs
-detached glass to regulator bracket

I suspect a motor issue probably brought on by very dry glass runs. Have the system checked for power and ground.