If it is serial communication it is not working correctly. With serial communication car 1 and car 2 are the dispatch cars, anything after these get hall calls from the dispatch cars. The communication wires start at car 1 go to car 2 and then car 3. There should be small blue factory jumper at the last car in the group telling the dispatch cars that it is the last car. If this jumper is missing or the comm wires are not connected, you could have hall call problems like this one. I am going from memory here and it has been a while, but i think the jumper goes beneath the serial comm wires on the same board. You should check another group if possible to be sure. also if you have IPD, that is not TED. IPD is inner-active, meaning the customer or anyone else with a terminal can change group performance settings. TED is not so inner-active. You should look at
the IPD carefully, if that's what you have.
