No, its an actual electrical module that controls various functions that deal with the door. BSM, folding mirrors, windows, etc. If you're curious what it looks like, it can be seen in the third and fourth picture in this thread:
https://www.golfmk7.com/forums/showthread.php?t=17907
Both the driver and the passenger door have their own. Addresses 42 and 52 respectively.
Look at the module number, the format will be something like "5Q0 959
X93". The
X is the important part, if its a 3, you have the low line models and will need to replace them with ones that have a 5, which are the high line models.