Buick Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry your having this problem
do you have a multi meter on hand ?
all other 3 windows work fine from the drivers and there own switches except the RR window ?
it is a meter to test for power and ground
a test light on hand ?
we have to see at the RR window switch is when the vehicle is running if the blue wire shows 12 volts at it at the switch
with a new switch and motor we have to see if we are missing power or ground
these are also common for broken wires in the RR door opening pass threw in the door jam
can you look for any broken wires in the door jam ?
does the blue wire at the RR switch show 12 volts with the truck ON ?
is the purple AND light green wires at the RR switch BOTH good grounds ?
if the blue shoes 12 volts and with a new switch and motor in the RR door and it still does not work up or down then this comes down to a bad drivers master switch assembly OR the purple or the light green wires are bad between the drivers window switch and the RR window switch
the blue should be 12 volts then when you push the switch up or down from the drivers master switch the purple should show a ground when pushing up or down and then the light green should show a good ground when pushing up or down
the odds are the issue is the drivers master switch bad not sending the grounds back through those 2 wires
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the window that will NOT work is the passenger rear correct ?
and the passenger window switch is brand new also ?
how are you making out ?