How long have you had the car? Has it be express up ever worked before?
If not maybe the owner before you changed the window regulator and motor and the motor could be one for a 00-01 deville that don't have the express up. I've made that mistake once.
I've only had it about 2 years express up has never worked on drivers window. Also just noticed the drivers side rear window goes up and down from master switch, but only up from switch on rear door.
Is it possible the drivers motor and likely regulator was replaced with one that fits but doesn't include the feature. The other 3 windows I replaced, drivers one gets the most wear so I'm guessing broke and was changed before I got the car.
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