The black wire could be the earth connection. Try connecting it to a nearby earth and see if things start working.
SOURCE: E320 CDI 2001 W210 TOW BAR WIRING
Perhaps this link will be of help to you. http://www.watling-towbars.co.uk/towbars.html
SOURCE: No power to electric windows and interior courtesy lights
This is a common problem, but I've never seen a window regulator go bad in a Mercedes, the problem is probably the switch, you can check his by removing both working and nonworking window switches from the console, and plug in the other side or rear to roll the windows up/down,you will need to disassemble the switch that does not work and clean it well then, it will work again I've done it to my Mercedes
Testimonial: "Helps a bit, will be checking switch out, Thanks"
SOURCE: mercedes sprinter 311cdi tiptronic transmission
Alarm sound is normal, sometimes does that, reverse light could be your switch fault or wires touching.
SOURCE: I have a 2005 Sprinter.
Hello
When these lights come on and stay on the systems control module is alerting you to the fact that a malfunction has occurred in the system, the system also records a fault code(s) in the memory of the ABS/Traction Control Module, (traction control is the same system). The first thing that needs to be done is to find out what these code or codes are, blindly replacing parts would be very expensive and likely not fix the problem. You will need to seek dealer help or a shop that has the proper electronic scanner to test the system, then you proceed with repair based on that fault code data. It is likely you have a speed sensor problem at one of the wheels, which one the test will indicate, remember it can be the sensor or the wiring to the sensor or the control module it self that is causing the problems.
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