How do I remove the back panel and replace the rear wiper motor?
I have the same issue, and just did it yesterday.
1. remove the rear hatch door handle with a T35 star screwdriver bit
2. gently pry the panel up exposing the two bottom plastic push fasteners
3. I used a flat prybar with the notch on the fastener and pryed both off
(the push fastener has 2 washers on the top end so get the pry bar under the top one)
4. Now pull the panel off the side door latches and gently pull down again to expose the two back push fasteners and pry them off too.
You now should be able to remove the motor. The wiring harness comes off easily after you figured out that the only the small end closest to the wires comes off, not the whole "box". Insert the small blade of a jacknife crosswise in the space on top of the connector and pry up the tab letting the fasterner slip off.
I found a motor on the net for about $80 (part number1880686) but it currently is out of stock so I have to wait a couple of weeks to finish. I put the panel back on without the push fasteners and will wait the 2 weeks. Buick dealer wanted $320.
Good Luck
Jim
517-784-5385
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I was able to complete the job today. The back panel came off slightly different as it had 4 of the plastic anchors that were pretty difficult to get back on. I switched out the motor and everything works great. One word of warning it to remove the plastic sleeve and o-ring from the old motor and put onto the new motor before installing. Or, you can install it twice, like I did once you realize that there is a piece on the old motor that is not supplied with the new one. I found one on-line in stock, 2 day delivery $60 after my $30 core charge.
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