Cheech and Chong!
In the 2003 Passat Wagon (US), it is under the carpet directly in front of the driver's seat.
How to remove the sun visor on a 2002 VW passat driver side
The service wrench button on a VW Passat is on the dash in front of the driver. It is next to the mileage (0.0) button.
Under the driver seat.
driver side of the cylinder head
the microswitch that operates as a sensor is apereantly inside the lock mechanism in the door: http://www.taligentx.com/passat/maintenance/doorlockmechanism/
have a look here http://home.comcast.net/~slashpub/
Airport Transfer Service Suzhou =-= Shanghai Hongqiao Airport Buick Lacrosse/Passat + driver 350RMB Buick Business 7seats + driver 600RMB Suzhou =-= Shanghai Pudong Airport Buick Lacrosse/Passat + driver 450RMB Buick Business 7seats + driver 700RMB Suzhou =-= Wuxi Airport Buick LaCrosse/Passat +driver 250RMB Buick Business 7seats + driver 450RMB Location Transfers Suzhou,Shaoxing, Shanghai, Wuxi, Kunshan, Jiangyin, Taicang, Nanjing, Nantong, Changzhou etc.
On the 2006 passat it is under the hood in the battery box. On some passats it is located in the trunk on the left side (US driver) behind a cosmetic panel.
Commercial driver, trucker,
Same as all cars, between the engine compartment and the driver,
Driver's side of the engine compartment with a light green cap.