VCDS-Lite is just a freeware version from Ross-tech... it has limitation as freeware, and you can only read some functions, plus the ODBII clear code, but not set or programs... unless your version is registered or.... Once registered / activated, it behave almost like the full version of vcds, except it only works on certain model cars pre-canbus. Also the magic label files might be missing a few but otherwise it's "like" vcds once activated.
as far as your wiper, I remember a few threads, maybe that was yours??? earlier last year I think, but not sure.
basically this is all mechanical and electrical so you'll have to exercise that digital multi meter... and verify if the potentiometer or that slide works and the wiring is not broken (E38 in your bently, it integrated into the stalk)... Not too sure how to check that windshield wiper intermediate relay module J31. E22 is your stalk with all the switches.... your bently Page 97-62
Mechanically, you are suppose to check if the motor works, basically it has two speed plus other stop wires... so , you'll have to find the 3 wire for the motors. 2 speed + ground.
Also check the wiper transmission and see if it is seized,
check the two wiper transmission linkage is seized .
There is an old article here to help you along.. it's just 5 bolts/nuts to take off..if you count the two nuts that held the wiper then 7... but putting back properly would require the transmission set at certain position. My wiper transmission seized so.... YMMV. Page 92-5 of your bently.