Db Br403 Ice3 Coach Lights Button?

I'm probably overlooking something very obvious, but where's the button to turn on the passenger lights in the DB BR403 ICE3?

 

These can be accessed on the left-hand MFD display in the driver's cab, I believe the option number is 5. The toggle for turning on/off the passenger lights is also 5.
This works the exact same way on the ICE 3's and 3M's

 

Thanks! Found it.