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Reviving this old thread to post some additional pictures and information as I just went through this job myself.
According to the wiring diagrams, I think these are the Z splices referenced in the "Electric Wiring Diagrams of Central Locking Systems" file and/or the X48F + Z82/6 splices documented in the "Central Locking System 146/1" diagram that shows power, signaling and phonemic circuits.
As previously documented, it is located under the floor ~12 inches in front of the rear right seat. If you aren't getting full voltage to the door lock pump, check the 3 Z splices. My problem was with the Red/White splice but since i was there I went ahead and redid the two ground splices as well.
To get the carpet out of the way:
1. Remove the right rear seat bottom (via the red lever) and the plastic bits that surround the seat mount posts
2. Move the front seat as far forward as possible
3. Remove the plastic door sill plate
4. Unbolt the rear sear belt latch (to get the carpet further out of the way)
5. Unbolt the front seat belt from the floor (this makes it easier to complete the next step and it also allows you to pull the carpet back a bit more.)
6. Remove the B pillar trim that meets the carpet
When I pulled the carpet back there was moisture left over from a sunroof drain tube leak I fixed last month. The drain tube shrunk and pulled back into the A pillar. This causes the sunroof to drain right into the floor of the car.
These pictures were taken after I opened up the wiring channel and removed the old electrical tape that was wrapped around all three splices.
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