Next step in isolating my central locking system vacuum leak - PeachParts Mercedes-Benz Forum

RML · #6 05-18-2021, 10:50 PM

Quote:

Originally Posted by christuna

Saying that the vacuum system is interconnected is like saying that the electrical system is "interconnected"

To put it in abstract terms "a wiper switch shouldn't open the windows"

Yes the engine shutoff uses vacuum and when it gets vacuum it shuts the engine off.

The vacuum shouldn't be getting from the locking circuit to the engine shutoff.

I think what is happening is: When I turn the key to lock the door, the valve in the door switches to the circuit without a leak and therefore the vacuum in the entire system can build up again and has enough pressure to actuate the shutoff mechanism for the engine. I think you are implying that the two circuits are isolated. I do not know. I am just presenting the symptoms and trying to deduce the problem. This is all new to me.

Since you mentioned "a wiper switch shouldn't open the windows", when I move the switch to adjust the passenger side rear view mirror in my 84 300D, the wipers turn on for one cycle. My understanding is that this is a grounding problem, but electricity is not my forte.