The OBD Port (the outlet itself) is poorly mounted in about every VW product made to date. So, I'd start right there to make sure all the wires are in place. One of them could be out of it's socket.
The OBD port has 16 sockets, however, only 8 of them are used. The Black Plastic Port has very tiny numbers by each socket. You'll need excellent light and eyesight to see them...... trust me, the numbers are there!
Socket numbers (socket is my term)
1. Is made hot by the ignition from Fuse #7 (black/blue wire)
2. no use
3. no use
4. Ground
5. Ground
6. To the Cluster, T32a/27, Green side (CAN Data Hi Bus) (orange/black wire)
7. To the Cluster, T32/25, Blue side (Data Link Connector, K Wire) (grey/white wire)
(SEE NOTE BELOW)
8. thru 12 have no use
13. Wire goes to the White Connector at 10w/1 at or near the fuse/relay panel but goes no further (dead-end) (wire color unknown by me)
14. To the Cluster T32a/28, Green side (CAN Data Lo-Bus) (orange/brown wire)
15. no use
16. Is hot (12 volts) from Fuse # 12 (always hot) (red/white wire)
Note: The K-wire from socket #7 goes to Splice A76 in the Radio wiring harness. One branch from the splice goes to T6/3 on the Radio Connector Plug. The other branch from the splice goes to the Cluster at T32/25, Blue side. (wire color stays the same in both directions on at the splice, grey/white)
If I am not mistaken, seems I read in one of the OPs posts that the Radio had been removed ......... maybe that is a hint.
Hope this helps... (let me know, as I will send you an invoice....