It is likely a Dexter keypad. I do not know if Dexter still manufacturers and supports this keypad, but I do know Jayco moved away from using them in 2015. In new units Jayco now installs the Bauer latch with the keypad integrated into the assembly, powered by replaceable batteries. As you mention the Dexter uses coach power supplied via door jamb contacts.
My '14 TS is at Jayco Service in Middlebury right now, one of the things they are doing is replacing my entire entry door which will incorporate the new Bauer keypad latch. After 5 keypad replacements that didn't work very long (or even at all) they gave up and are replacing the whole door. The whole new door is necessary so I am not left with a hole where the Dexter keypad used to be.
As I recall correctly, my original Dexter keypad did light up when you first touched a key, but the replacements units did not. Perhaps they did change the units they supplied Jayco.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST