B+ （KL30）） KL30 is battery positive, hot at all times 即KL30简单来说，就是汽车电池的正负极。B+ 接电源正极。
ILL+ - 接扬声器
KL is the abbreviation for 'klemme' which is the German term for connector / connection.
KL15 is ignition switch position #2 (on)
KL30 is battery positive, hot at all times
KL31 is battery negative, connected all the time
KL50 is ignition position #3 (start)
KLR means ignition switch position #1 (accessory)
