06-13 GM BCM Bench harness

Been trying to get this 06-13 BCM wired up on the bench and I have the HS CAN working no problems and I can read the immobiliser and IPC I have connected on the low speed bus but for the life of me I cannot work out how to access the low speed bus on the BCM.
Always says no communication so it must need a kick somewhere to wake up but I think I have tried everything and before anyone asks I have 2 x BCM's and both work in the car so I know it's not a faulty BCM 

Been trying to get this 06-13 BCM wired up on the bench and I have the HS CAN working no problems and I can read the immobiliser and IPC I have connected on the low speed bus but for the life of me I cannot work out how to access the low speed bus on the BCM.
Always says no communication so it must need a kick somewhere to wake up but I think I have tried everything and before anyone asks I have 2 x BCM's and both work in the car so I know it's not a faulty BCM 

Try sending a 1a b0 command on the low speed and see if it replies to that. 
Why are you trying to talk to it on the low speed? all programming, dtc scans, etc is done over the high speed with that.

I understand that it is mainly HS CAN but still it's details should come up on the low speed bus but it is like it is not there so not sure what that means in terms of wiring. You would think that whilst in the car you get the details so should be the same on the bench.

Will give that suggestion a try and see what happens...................Thanks


Update
Well it is there and it does communicate it just doesn't show any info on programs on the slow lan bus.
Just going to have to ignore it because in any event everything else is reading fine and showing details but since the BCM does HS CAN as well I suppose it does not matter in the long run.