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On the one Rendezvous I've ever worked on, it was in position 4A in the fuse panel which was located in the center console with the access door in the passenger side foot compartment.
Fuse #20
What fuse in the fuse box is for the automatic door locks in an Infinity J30?
The console fuse panel diagram for a Buick Rendezvous can be found in the service manual. The service manual is available at most auto parts.
2003 buick rendezvous fuse box diagrams
You may want to check the fuse
#14
15 AMP
In my '04 it's fuse 32 in the fuse box near the engine.
Fuse #29 in the center console fuse block its a 25 amp
Remove the relay or fuse for the door locks.
There is a fuse panel hidden under the dash on the passenger side, you have to remove the kick panel to access it, the fuse for the power locks is located there.