It is located just above the yellow connector under the passenger seat (there's also one under the driver's seat). It has these tabs, marked by the green arrows, but they seem immovable. What is the function of this cable (SRS is my guess)?


I am getting multiple CAN-related (SRS, Front SAM, anything connected to the steering column, etc.) errors which MAY have been caused by the cable pulling out of the ferrule when the seat was rocked back. (See this post: https://mbworld.org/forums/m-class-w...front-sam.html)

 

When there is a problem with SRS, there will always be codes stored. What are they?

 

There are so many errors (see attached Stored and Current) that it suggest the problem is not with a specific unit but with the interconnected wiring. In view of the fact that this connector's cable has been pulled out of the ferrule suggests the problem is likely there. This is why I need to separate this metal connector under the passenger seat. The very first error was the passenger SRS. Then the battery ran down and now there's a whole plethora of error messages.

 

How did this mess of codes happen? Was the car derivable and then what happened?

Was the car stored away for over a month without removing the negative battery cable?

 

I have already determined the problem through MB Star diagnostics and don't need further help with diagnosis. I DO need to figure out how to separate this connector and I suspect MB have a specialty tool (for example, similar to the fuel line pliers below) to fit in the holes:


Fuel line pliers

 

I have no idea how to separate it.

 

That's an interesting approach to asking for help.
Given its proximity to known SRS components (those yellow connectors) I'd likely find the proper procedures to disable said SRS prior to messing with it. At least disconnect the batteries for a day. Then I'd hit the connector with some silicone spray. Then I'd get the cable cutters. Don't cut the red wire.

I bet the WIS manual has the answer you seek.

 

I was trying to be very specific with the help I needed as there is a tendency for discussions on this forum to get wildly off-course. I've tried pulling fuses (lots of them) but to no avail. I assume it's the same as with ALL MB connectors there is a trick to release it: if so, I can't figure it out.
I have multiple copies of the WIS manual going back years and I can't find help there (it's not a great manual, difficult to use, and the outlined procedures are severely lacking detail).
The cable cutters are definitely on the cards and, if I don't get a specific response to my specific request within the week, they will be used.

 

Well, I got it separated with a combination of fuel line pliers and a dental pick:



Still the problem persists. Now, I will figure out which pins are CAN-H and CAN-L and insert a 120 ohm resistor to terminate it. Then check again, and, if that doesn't work, I will check for shorts in the connector. Finally, if none of that works, I will have to look for damaged cables elsewhere (for example, there was about 1cm of water in the bottom of the battery compartment). I am glad that I didn't cut the cable. I should have realized this was a video cable since, why else would it need shielding?

 

I have made progress having separated the connector I found a label on the cable:

X164 Front Seat Headrest Screen Monitor A1644409909 .
Incidentally, this label was damp.

 

According to your vin#, part #A1644409909 is for Rear Entertainment, which you have,code 864' and has nothing to do with with SRS.

 

This is correct as you can see from the post I made before yours with the picture of the label (in the caption).
ALL of the errors: SRS, Front SAM, compass module, etc. are just symptoms of the real problem which is a short on the CAN Bus wiring. Now that this connector is separated I have finally removed the front passenger seat completely and I can go ahead and trace the wiring issue. Because of the 1cm of water that I found in the battery compartment, there is likely to be other areas where there is water for example, the next likely place is in the area occupied by the Rear SAM, tailgate lift motor, etc. I have just finished examining the rear SAM area and it's dry.

 

As I started taking apart the driver's seat to get to the Central Gateway, I found about 6" of water in the well:

Some of it I could drain but the rest (several gallons) I removed with a Wet Vac: