Window rolling itself down

Not a perfect match, but my mercedes would occasionally do this as well, tech said window was somehow being reset to that level assuming that was "up". Reset solved it.

 

Sounds like a microswitch issue. The 15 second delay is part of the normal Window ECU logic. i.e. if you lift the interior door (opening) handle, activating the microswitch under the door handle, the window will drop, but if you don't actually push the door open, the window will rise after 10~15 seconds. It's mentioned in the Owner's Manual. It sounds like the system thinks you are trying to open the door (due to a faulty microswitch).

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Note, however, the door opening lever microswitch wiring is (electrically) in parallel with the external (doorkey) unlock microswitch, so this could cause a similar behaviour.

You could possibly isolate the problem by disassembling the interior door handle and disconnecting the microswitch plug (black one), then close the door. If the window still shows the same behaviour, the problem is probably being caused by the microswitches attached to the key lock barrel.

There are videos online showing you how to disassemble the door. Also, if you wanted to prove that the microswitches were faulty, you could check the wiring either at the main door plug or at the Window ECU in the driver's footwell (left hand side).

If this is above your skillset, I would try cycling the interior door handle a few times or unlock/lock the door using the key a few times. I don't think lubricating the lock would help as the microswitches are on the side of the key barrel (see photo)... but anything is worth a try.

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You can probably just make out 3 white microswitches in the photo. For info, the blue wire is attached to the "unlock" microswitch. The black wire (hidden behind the other wires) is for "lock". These keylock microswitches are probably significantly harder to access.

 

Here's a video showing how to disassemble the door.



Removing the interior door handle starts at about 3:20

 

If none of the above works, consider giving this crewe a call!

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My neighbor's 360 was doing this for a while. I suggested clearing /resetting the ECU by cutting power to the battery. That fixed the problem.

Ray

 

I don't see a connection between a sticking window mechanism and the window running up and down.

Do you mean the cable on the interior door handle? Does the door handle return to its resting position when you let go of it? If it was a door cable issue, I would have thought that the door wouldn't open/close properly??? If the handle and cable are sitting in their normal positions, they shouldn't be activating the microswitch.

Did you find the Window ECU? If the microswitch on the interior door handle or exterior key lock is constantly activated, you will see a constant earth (ground) on pin 16 of Window ECU connector "C". i.e. on the pink/black wire of the wiring harness.

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You can check this with an ohmmeter. One probe on socket 16, the other on a good earth.

 

For continuity...

 

I have no idea what's going on here. Is the Window ECU receiving a constant signal from a particular microswitch and has locked out the system? I would try the battery reset or reset all the plugs on the Window ECU. If no change, you can check all the switch inputs from the Window ECU connector (plug C):

Microswitch/Window ECU plug and pin/Door connector plug pin:

Armrest lock microswitch and exterior keylock lock microswitch: c-15 / 10
Armrest door open lever and exterior key unlock microswitch: c-16 / 11
Door unlatched microswitch: c-7 / 15 [This should be ok as it makes the window drop]
Outer door handle microswitch: c-6 / 12

All should receive an earth when activated. If there is a constant earth, then something is wrong.

What do you mean by 3)? The interior armrest lock switch or the exterior keylock?

Main door plug pin numbering:

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(looking at pins)

 

Hello I have the same problem with my f430 the passenger door window goes up ant the comes back down comes back up in 15 seconds, I have tried disconnecting the black connector on the inside handle and still same affect. I have checked all the micro switches with an ohm meter and they seem to be fine. my lights on the switches will also not turn off. An earlier reply said it could be the lock cylinder which the passenger door does not have only the latch I believe has a micro switch in it when I disconnect and connect the two wire connector on the latch the window will go up and down about a 1/2 inch. Completely lost as where to go from here.

 

Sorry, I'm having trouble understanding this sentence. What does the passenger door not have?

The lock cylinder has three microswitches.

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Only two are used:

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"SW2" is the unlock switch. "SW4" is the lock switch.

How did you test the switches?

 

Actually, that wiring diagram doesn't seem to make much sense. I think I was relying on second hand data for the switch internals. I assumed that the door locked/unlocked signal would produce an earth signal at the Window ECU, but the unlocked switch SW2, for example, seems to short out the blue wire (pin 3 on the switch) and the black wire (pin 4 on the switch).

It may be possible that two switches are activated simultaneously. There are cams on the key barrel which activate the switches, so anything is possible.

Normally, I'd buy a switch to test it, but they seem to be quite expensive... for poor Aussies.

 

Had the same problem with random window behavior a year ago on my 612. Every shop had a different theory and I probably paid for half a day of diagnostic time in bits and pieces to no avail. On a hunch I finally sourced a replacement NOS window control module and that fixed the problem. It comes as an assembly with the switch(es), module, bracket and leads but it's an easy plug and play once you get the door card off.

 

I tested the switches with an ohm meter, what I meant was the lock cylinder with the key is only on the driver side. So after I wrote the thread I kept looking for the problem and actually stumbled on to it. There is a micro switch that I didn’t see on the outside handle that was not installed in to the handle from the shop that was working on it. It was tucked in to the door. Once I pulled it o

hello I had a problem figuring out how many switches it had in the door. I actually found one problem and hoping the lights in the window switches will go out as well. The micro switch on the outside door handle was left disconnected by a shop that did some work on the door.ordred the clip that holds the switch in place once I get it will see if the lights go out but the window works as it should if I hold the micro switch closed.

 

Ah... I see. If I understand the parts manual correctly, the passenger side key only seems to go up to vehicle assembly number 74896.

 

Not entirely sure but sounds like a micro switch issue.

 

Do you live in a very cold climate? I'm wondering if it might be an expansion/contraction of various metals thing since it sounds like small tolerances could be involved could be the trigger.

 

Which switch? The armrest lock switch?