BTW Dave, here is my central locking pump PN:4A0862257F
Titanium Grey S4 Avant
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RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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You lock it with a key in the door, right?
The beep is correct for a 3 connector control module(they have an alarm). The "farting" noise is the vacuum pump inside the control module pulling a vacuum and activating the door and hatch/boot locks.

RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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I do lock it with the key in the door. The horn sounds like "farting"
thanks for the diagram mate 
EDIT: lioking at the digram, does it mean my pump has an output for foorwell lights?
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDIComment
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My first Audi, an 80 tdi saloon would fart everytime I locked the doors!
I didn't realise at the time that this was as Audi intended!
Oh well, I guess it beats the sound of my wallet wretching
everytime an Audi related repair was imminent!
1997 Audi S6 - The Purple Helmet!Comment
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C4 3 connector Central Locking Control Module Pinout
The footwell lights are on the same circuit as the grab handle lights. My 93 UrS4 has footwell lights but my 94 UrS4 V8 Avant does not. The central locking and light control module would turn them on (with the grab handle lights) but they were never there. To add to the interior light on the avant when I unlock the car, I bought another set of three switch position rear grab handles and installed them in place of the original two switch position front grab handles (I also did this on the 93 UrS4)
Some grab handle info: http://forums.quattroworld.com/s4s6/msgs/272716.phtml
Some three connector C4 central locking pump wiring info:
The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Right Click Remote wiring - 3 connector and 2 connector
The previously used diagram for the 3 connector plug 257D central locking and lighting control module (where you need one key turn to unlock the one door but two key turns to unlock all the doors) was this:
(note: I've corrected the T6/3 ground labeling issue).

The 257C central locking control module in the V8 avant was only a 2 plug and there was no remote and no alarm. One key turn unlocks/locks all the doors (and hatch) at one time. As result the wiring is simpler:
RS2'd 93 UrS4 5 spd sedan
94 UrS4 V8 6 spd manual avantComment
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Girlfriend is making fun of me every time I lock my car
Hope the new one I bought with RightClick will sound better.
Thanks for that DaveThe previously used diagram for the 3 connector plug 257D central locking and lighting control module (where you need one key turn to unlock the one door but two key turns to unlock all the doors) was this:
(note: I've corrected the T6/3 ground labeling issue).
The 257C central locking control module in the V8 avant was only a 2 plug and there was no remote and no alarm. One key turn unlocks/locks all the doors (and hatch) at one time. As result the wiring is simpler:
I need to get new vacuum line for driver's door as Audi were stupid enough to fir plastic ones
'93 Audi 100 Avant - R.I.P
'92 Audi UrS4 Avant - SOLD
'93 Audi UrS4 Avant
'15 Audi A7 quattro 3.0 TDIComment
Mine had alarm IIRC and also the horn in trunk,driver side panel(I think its green one?)

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