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control unit door warning

  1. 164 & 168 (1991-1995)
    I am new to 1993 164l...1) control unit - rear right "door open" light stays on when door is closed. 2) climate control panel - when air is "off", a pulsating sound is made from apparently the back of the unit as if trying to start up a motor or something. 3) courtesy lights - when are the...