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©
2006
Directed Electronics
13
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In Mercedes-Benz and Audi vehicles manufactured in 1985 and later, the door locks are controlled
by an electrically activated vacuum pump. This can be controlled by certain security systems if the
following wiring scheme is followed and the system is programmed for Mercedes/Audi lock pulse
lengths.
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Remember that the VIOLET jumper between the #87 lock terminal and the #87
unlock terminal must be cut.
The wire to be cut and interrupted in these cars will test to be resting at (-) ground when the doors
are locked, and rest at (+) 12 volt when the doors are unlocked.
This wire can be found in either kick panel in the Mercedes-Benz. It is BLUE in the driver’s kick
panel and GREEN in the passenger kick panel. In Audis, the driver’s side wire is often
GREEN/BLUE or GREEN/RED.