why would this be the case and how do I turn it on?

I have disconnected nothing.

no one?

Is this a new issue?

What age is your superb?

Is this the original headunit, if not, what was?

Do you have an antenna on the roof?

 

From a cursory google, I found one possibly related result (one ant on, one ant off) here but I'm not sure if the Superb ever had an external diversity box : https://www.mytreg.com/index.php?/topic/8392-required-aerial-mod-for-rns510-retrofit-to-t1/

 

Depending on your answers above, it might be that one of you antennas or wires has a fault.. :/

 

@Rustynuts might have some other ideas.

Possibilities are either a faulty roof antenna, a faulty side window antenna (depending on which are actually fitted to the superb) or a faulty radio board in the Columbus.

2016 L&k estate

all original equipment

The tv reception has got worse lately which is why I was scanning around.

Yes sharkfin aerial on the roof.

I will have a look at previouse vcds scans and see if the aerials are reported in a full scan. I may as well do a full scan too.

 

thank you both