The BCM is the Body control module.
So you have the Audi engine and computer, ECM.
And the DSG gearbox.
But the clocks and doors and lights etc etc etc c on the van are all run from the T5 BCM.
So I'm assuming you have the T5 factory BCM stil running.
And assuming that the ECM is connected to the BCM and clocks etc....
The T5 BCM is up under the dash above the peddles.
Only left old bcm to power central locking/ lights/ wipers tbh , as it’s only 06 not complatable with anything on audi side ,