how does diff lock switch work?

[glen powell <gpowell@acacianet.com>]

>> Poor guy - asks a simple question and gets 3 different answers!
>> 
>> How bout . . .
>> 
>> "1" locks front wheels
>> "2" locks rear wheels

>I don't think _ANY_ Audis can lock the front differential.

Correct.

>The order in consumer vehicles is usually back first, then centre.  On the 
>original 80Q implementation, a pull-out knob had two positions - click one: 
>rear, click two: centre.

Not correct. Pull out knob, click one = center only locked, click 2 = center and rear both locked.
Pull out knob fully in = both center and rear open.
Same for the rotary version, pos 0 = both open, pos 1 - center only locked, pos 2 = both center
and rear locked. (regular production USA models)

-or-

POS 0 both open (computer engineers always start counting at zero..... :)
POS 1 center only locked
POS 2 center and rear both locked

-glen