Below is a list of light bulb types used in 2014- VOLKSWAGEN PASSAT lighting system, covering estate and saloon 4-door vehicles.
Interior light bulb: W5W
Boot light bulb: C10W
Reading light bulb: W5W
Glove compartment light bulb: W3W
Headlight bulb: low beam - H7 / high beam - H9
Parking light bulb: W5W
Fog light bulb: H8
Front indicator/turn signal bulb: WY21W
Daytime running light bulb: W21W
Light bulb sizes for other VOLKSWAGEN PASSAT generations: PASSAT (B7) / PASSAT (B6)