It may be under the back seat,,buick notorious with that..
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Remove the rugs from the second row of your Enclave. Doing so will reveal the latched battery compartment on the passenger side of your vehicle.
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Unlatch the battery compartment lid.
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Use a ratchet or combination wrench to unhook the clamp holding the battery in place.
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Detach the negative (black) battery cable from the battery, using a combination wrench to loosen the nut. Twist the cable connector and pull it off of the battery.
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Detach the positive (red) battery cable from the battery using the same method that you used on the negative cable.
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Pull the battery from its holding case in your Enclave.
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Install your replacement battery and reattach the positive and then the negative battery cables. Replace the battery compartment lid and rug.
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On ur Buick Enclave it must be under the front passenger seat.
Http://www.buick.com/content/dam/Buick/north_america/usa/nscwebsite/en/home/owners/vehicle_manuals/2008/02_pdf/2008-Enclave-Owner-Manual.pdf
According to the user manual, it's under the hood.
Pages 5-40 thru 5-44
08 n 09 owners manual have several incorrect information areas...IE taillight bulb numbers
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The battery is in a compartment located right behind the passenger front seat, under the floor mat for the mid seats. You will need a star screwdriver to remove one screw to open the compartment. In order to remove the battery you will need to disconnect the cables and remove a hold-down block using a socket and an extension. You will need a battery post lifting strap or something to be able to lift the battery out of the box as there is no room to get your hand under the battery. The cover has clips to align it with the seat tracks. Hope this helps.
SOURCE: 2008 buick enclave passage door panel removal
You need to remove the retaining clips from the door. http://www.ehow.com/how-does_4815790_removing-door-panel-buick.html Hope this helps! Please rate 4 thumbs up!
SOURCE: HOW DO YOU CHANGE FRONT RIGHT HEADLIGHT ON A 2009 BUICK ENCLAVE
you must remove front bumper cover
SOURCE: Where is the coolant drain plug on the 2008 buick
I could not find one on my Enclave either. I ended up disconnecting the lower rad hose and draining the coolant that way. It worked fine and was easy to do.
SOURCE: Key stuck in buick enclave in acc position.
if acc is the one before the starter then no as you have to turn the key in order to start sorry! but if it is lighting the dash up with battery and engine lights then u can short the rear of the ignition barrel by taking off the cowling {around ignition} then there should be wires soldered to the back of what we call the black [or white] box. once youve charged the battery you can cross the back wires using a screw driver, when you hear it turn over you can determine which is the live feed and cross with starter wire. failing this the best i can advise is removing cowling and taking black{or white} box off the back of the ignition barrel end and then you will be able to drive it until you get a new ignition barrel hope that helps
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It is right behind the passenger seat in the floor. Raise the mat and you will see the cover there.
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