miscommunication to BCM

[dirtwarrior]

Shout out to [B]K4fxd[/B] he came to work on the electronoics on my car. There is no communication between the BCM somewhere. Here is the symptom. On brake and turn signal the outter of the tribar lights do not light up. The button for the trunk release does not work. He hooked his laptop scanned and found a miscommunication error. I know very little beyond this.
Question are these to things connected some how? How would I track the miscommunication.
K4fxd has a black GT Mustang by the sound it his far from stock. It looks and sounds great. Maybe he can provide more info than I did.

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[K4fxd]

I reset all modules and downloaded and flashed as built info to the body control modules.

Faults were can bus coms fault and a short circuit fault. Can bus fault was current.

 

[dirtwarrior]

Could this be the issue?
https://www.mustang6g.com/forums/threads/2015-mustang-gt-trunk-latch-will-not-open.103386/page-3

 

[K4fxd]

I didn't think to see if the rear camera works. Very possible and this should be covered under a factory recall.

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