Mercedes W164 ML420 Tailgate Opening Functions, Issue with Closing: Position Sensors & Diagnostics

Hello gentlemen, patient MB w164 ML420 and the problem with the tailgate, it opens with the button on the tailgate, opens with the button on the door and in the remote control while the problem is with closing and more precisely it does not close it at all, you can only close it manually. I checked the wiring from the tailgate , close and open buttons, apparently there are some position sensors there ?? I don't know where to fumble, the more that the diagnostics show no errors and the readings from the parameters seem to be correct too (kts), did anyone have a chance to fix it?

Open / closed / bolted (or somehow similarly named) such 3 states should appear in the parameters, all agree?

You probably have one of the anti-crease "seals" damaged.
These are two thin seals on the edges of the bonnet trim of the boot lid. Their connectors can be found inside, near the rear lamps, maybe there is corrosion.
If these limit switches are damaged, the cover does not lower, and if damaged micro-contacts in the lock, it does not bolt it.

they act as the lower limit switch in the garage door.
When they fall on an object, they immediately rise.

You will not know what and how, speak to me, take pictures and send.
I have V251, but it's the same.

I warmly welcome,
I just found this post and I also have a problem closing the boot lid in W164. What should I do?

michal2045 wrote:

readings from parameters

First, you must describe what is going on.

I replaced the lock in the flap, the lock worked for some time, too .. once squeaked as if he could not stop tightening the flap and since then the tightening does not work.
And you have to slap the flap then it will close.

Hello gentlemen,
If someone could tell me what could be the reason that this is not my reaction at all. I have to open and close it manually and the lock and pressure work. It happened after the battery was discharged because for some time the car was unused. If anyone could advise I will be grateful.

Maybe the door handle above the board locked in the open position?

maybe you need to re-learn the end positions of this damper

Sorry guys, but I don't understand "how to learn" again

this is the so-called matching procedure, the controller calculates the end positions and the moment of the flap tightening on the basis of the load / current consumed by the damper closing actuator, in every good diagnoscope this option will be

michal2045 wrote:

this is the so-called matching procedure, the controller calculates the end positions and the moment of the flap tightening on the basis of the load / current consumed by the damper closing actuator, in every good diagnoscope this option will be

You have no idea what you're writing about. You haven't seen such a system, buddy.

For the correct operation of the electric closing and opening of the boot lid,
a functional battery is needed. This is to start with.
There is no such thing as a moment of tightening the flap.
The lid slams down with its own weight and then snaps onto the first latch, after which the second latch closes.
If the cover does not latch under the effect of falling on the first latch, then no force closes it anymore, because the hydraulic cylinder in this position is already out of the scope of its operation. In the upper position of the cover, a decrease in the current consumption of the aggregate is detected as a result of the hydraulic cylinder coming out of range work, after which opening is completed.

Jaśli Colleague MarcinBigus writes about a different model of a car or a car with the function "Stop low ceiling of the garage", this is a different story, in mercy there are also only electric opening and closing systems.

Hello,
Can someone solve the problem with the boot lid failure - And exactly with the lid closing failure?
For me it also opens up automatically, but there is no reaction when I want to close it (Whether it is the button on the door, the flap or the key).
I will add that I have a new battery and the seals are very good. condition.
I request information .

_Megamax_ wrote:

(...)
and if the microswitches in the lock are damaged, it does not lock it.
(...)

You will not know what and how, then speak to me, I will take pictures and send.
I have a V251, but it's the same.

Can you reassure me that the limit switches in the lock are responsible for my condition? Opening and closing works from any signal source. After the flap is lowered, the actuator tightens it, tightens it and releases it. I have to manually hit the hatch to make it slam shut.

Is there an option: "disassemble the lock, fix the limit switches, fold it and it's ready"? Do you have any experience with it?

Oh, I have a 2006 V251.

First, loosen the bolt in the rear belt and slide it to the max to the outside and check.

I actually thought about it, but for some reason I haven't done it yet. I'll let you know if it helped!

edit:

After sliding the bolt out, the hatch closes nicely, but the drawstring does not even try to react.
After moving the bolt a bit further in, the hatch closes, and the catch only hums for a fraction of a second, and the hatch does not even have time to move.

The only thing left is that the bolt is extended so far that the closing does not start, and the hatch, in turn, has no slack on the bolt - it closes under its own weight, and there is no message about the hatch not being closed on the clocks.

There will be time, I will disassemble the lock on the flap.

Hello, I have a problem in a Mercedes r class 251, the hatch opens but does not close. I fixed the safety seals, but the SD shows the error of the position sensor, hatch tilt, where is this sensor? I looked on the net it looks like an actuator with a cable. At the top, at the hinges, on the left, there is a spring and a hydraulic cylinder, and on the right, only a spring, but I noticed that one ball is free, should this sensor be there? In sd parameters, the position of the flap remains at 6, it does not change

Right hinge, under the ceiling.