00 00... Checking horn, headlight flashers and hazard warning system: Horn
WARNING: This page is about a different car, the 2010 BMW 128i, 2009 BMW 128i, and 2008 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.
Check function.
NOTE:
In the case of twin-tone fanfares, make sure that both fanfares are working properly.