Individual components of vacuum control unit

Fig 1: Installed Location Of Vacuum Control Module

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - From check-valve -3- to intake manifold. Refer to Intake manifold (vehicles with engine code BJS), disassembling and assembling  , item 10

2 - From Exhaust Flap Valve 1 -N321- to vacuum actuator. Refer to Muffler with mounts (vehicles with engine codes BJS)  , item 12

3 - Check valve:

White valve side points to vacuum reservoir

Check Exhaust Flap Valve 1 -N321-. Refer to Exhaust Flap Valve 1 (vehicles with engine code BJS), checking  .