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Old 05-29-2019, 08:12 AM
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Join Date: Dec 2018
Posts: 11
560sl Central Lock Actuator Electrical Connectors

My 1986 560sl central locking system was no longer working and I tried to fix myself and found the problems were due to the connectors to those vacuum actuators. Due to the age and long exposure to the southern heat, those electrical connectors were totally broken and rusted. The original nylon connectors were broken into many pieces when I pulled the connectors off the actuators. Now I counted a problem to plug them back, as I forgot to note down the order of how those colored wires were connected to the actuators. There were three wires to each of the actuators (driver door, passenger door and trunk lid), I have (brown, redwhite, blue) for the driver door, (brown, redwhite, green) for the passenger door, and (brown, redwhite, yellow) for the trunk lid.

Can someone please tell me how those wires suppose to be connected back to the actuators? I noticed the old connectors used to have a flat edge. With that flat edge facing down, the three pins form a triangle. How are three colored wires going to the pins?

Mant thanks!
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Old 05-29-2019, 06:14 PM
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Join Date: Dec 2018
Posts: 11
OK, I got it figured out.

With the connector flat edge facing down, you will have the signal wire at the top pin. The drive door signal wire is blue color, the passenger door signal wire is green color, and the trunk lid signal wire is yellow. Then the brown (ground) wire goes to the right pin, and the redwhite (positive) wire goes to the left pin.

Basically, when the actuator is sucked in (unlocking position), it will connect the positive to the signal wire, while it is in expanded (locking position) it will direct the negative signal to the vacuum pump in the trunk.
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