WARNING: This page is about a different car, the 2004 Volkswagen R32. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Installed Location Of Vacuum Control Module
Courtesy of VOLKSWAGEN UNITED STATES, INC.
1 - From check valve to intake manifold
2 - from exhaust flap valve 1 N321 to vacuum actuator
3 - Check valve (white side faces the vacuum reservoir)