No cruise and engine brake on 2012 Cascadia CM2250

[Sergiu]

No cruise control or engine brake on 2012 Freightliner Cascadia since I bought it with original calibration till this moment with the mandate removed. I thought it may be the brake switch, then I thought it is the steer clock spring I tested the buttons with DDL software signal is good the light comes on when the cruise button is pushed, but it doesn't set up, no PTO also the engine brake will not activate. Does someone know how to diagnose for proper communication between OEM control module and the engine ECM ? If there is a specialist I would come to his place, let me know please $