NOTE: If your wiring looks different, meaning you do not have a yellow-brown-red-brown connector as shown, please be careful, review Bentley and check the results before doing something permanent. I personally prefer pulling out the terminal from the connector, which seems fully reversible. This seems more failsafe (only one yellow wire), but the initial reports suggested diking off the (0.35mm) brown wire, so 'you are your own warranty' on this one. It may be that the yellow (ge) wire could be diked off instead. It is alternately possible to dike off the brown wire, but you still need to get the correct brown wire. Or better yet, keep the windshield washer fluid at a low level. Remember to turn the radio to a very loud setting when starting the car, as a substitute for the annoying chime.
SNAP ON MODIS ULTRA TURN OFF SEET BELT CHIME CODE
Clear the DTC code (if you had previously tested the chime or if you somehow screwed up). Plug in the connector, and replace the seat. Insert the needle nose over the exposed part of the terminal for the brown wire, and pull. (Again, this is the side with the red and brown wire.) The connector body hinges at about 1/2 way back, exposing the back of the terminals going to the red and brown wires. Do this by inserting the small flat screwdriver under the outside of the connector from the wiring side, and lift up. Flip open the side with the red and brown wires. Select the side with red and brown wires. The smaller connector has 4 wires: red, brown, yellow, brown. This will also throw an airbag DTC code, which you will clear when you finished with the wires. (This step only if you have a scanner (VAG-COM) capable of clearing the airbag code) Turn car's ignition switch on to determine if this kills the seat belt chime. If you damage these, the connector will still function. 
Note, T4a has side guards adjacent the release tabs. Unplug the smaller yellow connector ("T4a"). The larger connector has a "flip back" guard and a tab release, but the smaller connector only has side clips. 'Carefully' to avoid breaking the wiring harness.
Carefully move seat back on track and tilt front of seat upward. (Flat screwdriver or dental pick to remove little screw covers, and I think phillips #2) If the illuminated seat belt symbol is cancelled, you have the right code, so if the chime persists, continue. Attempt to disable the chime by soft coding. It is presumed that one would normally wear the seatbelt, but either doesn't want the annoying chime when starting the car, has reason to shunt the car at parking spaces, or has the engine running while parked or waiting.ġ3mm socket, small flat screwdriver, phillips #2 and needle nose pliers recommended. Do not proceed until you have read the usual precautions. Be aware that you are messing with equipment connected to the airbag module. What we are trying to do here is disconnect the ground which, when connected, enables the seatbelt chime. In any case, "T4a" has two brown wires, which would correspond to two ground circuits. 
As to the other switch connected to "T4a", it does appear that the airbag controller has a "seat belt" and "no seat belt" setting, perhaps to cause the airbag to inflate responsive to a lower impact in the "no seat belt" setting. Both seem to have switches on the driver's seatbelt. One is the airbag control module and the other is the seatbelt warning module. Mechanically, Bentley shows two modules.
Later cars are more annoying in that the chime will repeat at intervals.
This probably applies to 2002+ Mk-4 cars with side curtain airbags, and probably some of the other VAG models that follow the "delete 2" soft coding. ( t=253374 - 'remove/disable seat belt chime') and on the VAG-COM website: Earlier models will delete the chime by subtracting 2 from the soft setting, described elsewhere in this thread. As with most (all?) persistent DTC codes, when starting, the light will illuminate, then go out momentarily then go back on. Airbag DTCs are persistent, so you must use a code scanner (VAG-COM) to cancel the DTC. If you turn on the engine with the connectors unplugged, you will throw an airbag DTC code. So this applies to vehicles, I believe starting year 2002, in which the seatbelt chime does not delete with VAG-COM. The VAG COM instructions seem to be good up to 2002 (maybe also 2002 without side curtain airbags if there is such an animal). I've also had no luck in disabling the chime only the light, which doesn't help at all.
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