I found the cetral loking control unit in the trunk, on the right side, behind the wheel well, next to the rear quarter panel. With the trunk open; remove the carpeted inner panel and you find what you are after. It has vacum tubing coming out of it.
PLEASE NOTE MY CAR ID A 1995 90Q B4 PLATFORM. I IMAGINE THAT YOURS SHOULD BE IN THE SAME OR SIMILAR LOCATION.
GOOD LUCK
PETE
NEW YORK :57: