How do you remove the rear speaker covers to change the speakers in a 99 grand prix gt?

See Related LinksSee the Related Link for "Replacing stock speakers" to the bottom for the answer. AnswerYou will need to remove the back seat in order to remove the back dash and this will allow you to remove the back speaker covers.

I just did the speakers this past weekend in a 2001 Grand Prix and am pretty sure it is the same. Take the lower part of the seat bench out first. There are two plastic loops at the base of the seat that release the seat, while holding the loops with outward pressure, just pull the seat bottom up and out. The seat back is removed by removing the two large nuts that hold the seat belts (If I remember right they were about 17mm). There are two other nuts on either side that use 10mm that need to be removed. Once the four nuts are removed, lift the seat back straight up to unhook the four hooks that hold the seat back in place. After removing seat back the two interior plastic retainers need to be pulled out to get the rear deck/speaker grills removed.

Once you are down to the speakers they can be removed by removing the four screws with a 1/4 inch socket wrench. Carefully lift the speakers out as they are still connected to the wiring harness. Lift the speaker up just enough to disconnect the plastic wire retainers from the speakers. (If there is not enough slack in the wire to do this from up top, they can be disconnected from inside the trunk.) Cut the plastic clips off leaving as much wire as possible. Either strip the wire ends and crimp new ends on or splice the new harness in.

GMs color coding for Positive and Negative is less than intuitive!! Here it is:

Right Rear speaker:

(+) Dark Blue

(-) Light Blue

Left Rear speaker:

(+) Brown

(-) Yellow

Good luck. I put Clarion SRG6921R and am very happy with them. Even though the tweeter protrudes quite a bit there is still plenty of clearance. For the price and if you are not running an amp they can't be beat!