KSell5500
Junior Member
2019 5500 purchased used. ... I'll start by saying; I've never had the controller function properly. Everything appears to function properly. Dash changes over to display electric brake output when the lever is pulled. Output changes on the display as (I would think) it should as brakes are applied. etc...
The issue is NO: output power to brakes, trailer connection/disconnect communication.
Troubleshooting thus far:
*I've toned the wire from the trailer plug into the cab at the ITBM. Signal seems weak but present.
*Disconnected the ITBM while truck is running and did receive the "service system" message.
*Replaced ITBM with new a unit resulting in NO change
*Connected brake force meter with NO connection to ECU, NO acknowledgment from truck, and NO brake output. All other lights/connection functionality present. Connected to both goose and bumper plugs with identical results.
*Driven around with brake force meter plugged into both goose and bumper plugs at speeds of 45+ mph with no intermittent messages concerning trailer connection/disconnection or changes to electric brake output.
Attempted to connect two trailers with identical results. Both trailers have had NO issues with electric brakes. Understanding this is the first vehicle with an integrated controller and reading about sensitivity to grounding systems, I added a dedicated ground to the trailer frame at each wheel with no change in controller functionality. I also added a ground from the junction box directly off the ground stud from the trailer plug to the trailer frame with no changes.
Anything of help here would be greatly appreciated. Schematics of the system to assist in troubleshooting (throwing more money at) components (electronics that I can't test)... anything....
The issue is NO: output power to brakes, trailer connection/disconnect communication.
Troubleshooting thus far:
*I've toned the wire from the trailer plug into the cab at the ITBM. Signal seems weak but present.
*Disconnected the ITBM while truck is running and did receive the "service system" message.
*Replaced ITBM with new a unit resulting in NO change
*Connected brake force meter with NO connection to ECU, NO acknowledgment from truck, and NO brake output. All other lights/connection functionality present. Connected to both goose and bumper plugs with identical results.
*Driven around with brake force meter plugged into both goose and bumper plugs at speeds of 45+ mph with no intermittent messages concerning trailer connection/disconnection or changes to electric brake output.
Attempted to connect two trailers with identical results. Both trailers have had NO issues with electric brakes. Understanding this is the first vehicle with an integrated controller and reading about sensitivity to grounding systems, I added a dedicated ground to the trailer frame at each wheel with no change in controller functionality. I also added a ground from the junction box directly off the ground stud from the trailer plug to the trailer frame with no changes.
Anything of help here would be greatly appreciated. Schematics of the system to assist in troubleshooting (throwing more money at) components (electronics that I can't test)... anything....