One problem related to horn assembly has been reported for the 2008 BMW 328. The most recently reported issues are listed below.
The contact owns a 2008 BMW 328i. The contact stated that while sitting in the vehicle with the radio on, the electrical system malfunctioned and completely shut down. The contact was locked inside the vehicle for 40 minutes and was unable to use the horn to indicate that he was trapped. The contact called the manufacturer to unlock the vehicle. The vehicle was then towed to a local dealer, who stated that the power in the battery in the key fob was low, which caused the failure. The manufacturer did not offer assistance. The failure mileage was 180,000.