No DCS signal out of Variable 1 & 2

I have an original G TIU That has software version 5. I have only been using Fixed 1 & 2 all these years with a z4000 and the z4000 receiver from the remote commander. Using the DCS remote. Have even been using the Wi-Fi adapter and App. DCS has been working great on the 2 fixed channels. And still does. Decided to build a programming track area using variable 1 & 2 and two z1000’s. setup them Up as fixed....1st using the DCS remote...made sure DCS was turned on for all channels. There is full voltage to the programming track But still no DCS on the  variable channels......any engine placed there shows not on track or out of range. tested the wiring run to the programming  track by using one of the fixed outputs. And all was good. So it’s gotta be the TIU....am I missing something? Even looking through the Wi-Fi app I do not see anything wrong..except in the premium App there is only a track selection for variable 1 & 2. Nothing for fixed...unless you go to select the TIU and its setup....