I found this info on the Web, haven't check that its correct, but no reason to doubt it as it was on a Audi/VW site.
On the MK1 its under the ashtray in the centre console.
On the MK2 Sharan Galaxy and Alhambra it is located underneath the bottom of the dashboard, in line with the fuse box access panel on the driver's side of the car. Stick your head under the dashboard and you will see the pink connector.
Dave