I and many others have in the ongoing Beta been a little perplexed for what the Data Link Scanner does, since when we have tried using it on anything it doesn't seem to do anything.
It's perpexing and will probably be fixed very soon, but for now the case is.
The scanner needs to be deployed, the devs have forgotten to deploy this along with the turret when you exit your ship, and the regular "deploy hardpoints" button doesn't do anything inside the buggy (aptly named little craft, probably why FD is so adament it's an SRV..)
The solution is somewhat annoying, but simple.
Go into control options and under the weapons category set "firing deploys hardpoints" to ON.
You also need to assign a dedicated key to the DTS directly.
For some reason just defining this in fire grouping does nothing, unless setting it to fire one in group 1, this means you can't shoot the turret.
You might as well just bind secondary fire to the Data Link Scanner directly.
All the pre-defined key binds has this set which is why switching to a default key binding scheme has worked.
I believe this will be patched very soon, but figured I might as well make post here on it.
The scanner only needs to be deployed once after exiting your ship too, once deployed it stays deployd until you go back into the ship.