Hi,
First, I attached the wiring schematic for a reference tool. The left signal and brake lamp is powered by fuse 14 in the interior fuse box (BCM).
The first 4 pics below are the schematic. I had to cut each of the two pics in half to make them readable for you, but I did overlap them and highlight the wires involved.
Pics 5 and 6 show the fuse legend and the location in the fuse box to check.
In addition to checking the fuse, make sure there is power both to and from it. The fuse could be good but have no power to it.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Let me know what you find or if I can help in any way.
Take care,
Joe
See pics below.
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Monday, November 29th, 2021 AT 7:04 PM