How do i change the rear turn signal on a 2005 pontiac gran prix

You have a body control module problem, more then likely . The BCM turns the turn signal on an off. Have a scan tool hooked up (a profesional grade scan tool ) One that can read codes in the BCM.

Turn Signal Lamps
The STOP/TURN/HAZARD fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the LEFT TURN or RIGHT TURN position, ground is applied from G202 through the turn switch, to the turn signal switch signal circuit and to the BCM. The BCM then applies battery positive voltage to front and rear turn signal lamps supply voltage circuits. The left front turn signal lamp is grounded at G100, right front at G101, left rear at G301 and the right rear is at G302.


DTC B3948 Left Front Turn Signal Circuit

Do a search on goggle, put in the make, model and engine size and it should show you the firing order. Hope this helps.

https://youtu.be/c3rHuIKEUiw

publick library.

Move the seat all the way back and the front bolts will be accessible.

P0411 secondary air injection system incorrect flow detected.

Depends on whether or not your Gran Prix has rear drums or disks. If discs it is very straight forward. With the shoes, you have to remember where all the parts go, label them, it helps. Always note OW a part comes off, so you can do it backwards.

There is a Special tool for this But I Sometimes Use Channel Locks .
You have to "TURN IT" CLOCKWISE To COLLAPS IT Thats IT !
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I have the exact same problem on a 2003 Gran Prix GT. All lights including Stop Light works. Brake lights do not. Have you found a solution.

there shoud be a little torx scrw holding it on remove it its either a t10 or t15 torx driver