In order to troubleshoot car stereo speakers, the first step is to remove the door panel. Check car stereo speakers to see if the problem is in the radio or wiring with help from an auto mechanic in this free video on car maintenance and repairs. Expert: Tom Brintzenhofe Bio: Thomas Brintzenhofe has been a certified mechanic for the past 14 years, and a certified master mechanic for the past eight years. Filmmaker: Reel Media LLC