Have you done all the relevant wiring ?
I havent done a 6.1 but if its the same as a 6 then there will likely be an additional cable from the light switch to the BCM required and also you need to check the feed wire is in place from the fusebox to the bcm, this feeds the relay that outputs to the 2 connections you populated, some vans will have this wire in place already dependant on spec
If your machine is capable of output tests then you could try manually activating the foglight output to see if they work (will also prove if the feed is there)