No power to ABS pin on trailer wiring. No brake lights

I have similar problem. Vin #GV0254

 

I have similar issues my vin GV0254

 

Check your fuses F11 and F14 and relays as stated earlier. This is under cover of SAM Chassis on engine side of firewall.
If that checks on then then you will need to check the wiring. Your SAM chassis connector X55 pin1 has your abs circuit. Connector X55 is the lowest connector on the cab side of SAM Chassis. If you don't have the Cascadia wall chart saved here is a link. https://www.dtnaecomponents.com/Fre...DateAugust2nd2010AndNewer/SAMWallChart6_0.pdf
The harness than goes back to rear of cab where is plugs in to the harness for 7-way receptacle. That would be another place to test to determine if you have a broken wire for example. Your ABS power wire is going be Dark Blue circuit 45 and also identified as 1903. I taken a couple pictures of diagrams and harness layout that may be helpful.

 

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