Option code 688 · Audio & Communication
Harman Kardon surround sound
The mid-premium audio upgrade — instantly visible on the speaker grilles, instantly checkable on the build sheet.
Documented on
- E/F/G-generation models
How to confirm it on a real car
BMW records factory equipment on the vehicle order record (and readable from the VIN). Stickers go missing and cars get modified, so the ground truth for any specific VIN is the factory build record: every option code the car was born with, including 688 if it was ordered.
Was 688 on your car's original build?
The CarWhere build sheet decodes any BMW VIN into its full factory record — every option code, the original paint, trim and equipment, as built. $9.99, instant.
More audio & communication codes
Independent reference; not affiliated with BMW. Applicability varies by market and model year.