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Published on Feb 25, 2010
Here's how to the diagnostic test the diagonostic test on an E46. This will also work on almost any BMW built in the 90's and up:
1. Press and hold left button. 2. Turn key to at least 1 click. let go of left button. 3. Press left button again so "test 2" appears. 4. Wait about second and press left button again. 5. enjoy the show light show.