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You need to take the back seat out. Remove the C-Pillar trim panels. Lift up on the package shelf. Unplug the wiring connector. I've had mine out when I changed the speakers.
BTW, Its Not a Bulb. Its a LED Assembly. Replaced as a whole unit. Unless your good with electronics and soldering.
Stop Lamps
The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.
Did you check the blub , is there power ( B+) at the third light ? Is the ground G302 good ? Do you have a DVOM - digital volt ohm meter , do you know how to use one ? Do you know what voltage drop is ? an know how to test it ? Check the stop lamp relay in the under hood fuse / relay box.
Did
You obviously have a poor connection there somewhere. I'm sure the dealer will help, but whether or not this is warranted may be another issue. A third brake light can't ever be that hard to repair for a dealer.
Try checking the electrical connector which goes into the brake light.
If the third brake light always works, then it is the turn signal switch. If the third brake light does not work, it is probably something else. The turn signal switch is in the steering column. You have to remove the airbag and steering wheel, take out all of the componets and replace the turn signal switch. Special tools are required and a moderate level of mechanical ability. Watch the airbag, it can go off and cause serious injury!!
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