It will only lock if it is latched. If you just have it plugged in to try it you would need to latch it for it to lock. But to answer the question, I believe it is lin bus operated and any relays for the central locking and windows would be internal to the general module. But there is always the possibility of a bad connection at the connector in the door jamb, blown fuse in the glovebox located fuse panel, etc. That's the beauty of the GT1 and other dealer systems is it can see lock/unlock requests and statuses through diagnostic resuests and can activate the components individually through component activation... Makes diagnosis easy.

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X5 pics

RIP 4.6is.....

2003 4.6is