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Thank you @konigstiger for this essential procedure.
I can see this is not an easy job even with a car lift.
a spline helps gear alignment
The WIS procedure calls to remove drive shaft, cat-exhaust, engine support beam, lower the transmission and remove paneling covers... the engine is allowed stay put!
There may be ways to shortcut procedure by not removing the shaft and muffler by using slim wrenches (12mm, T20).
Now -> Reflecting on the failure mode of this module, I have decided for now to only prevent moisture intrusion through the leaky connector wires and to secure the vent pipe in place.
Later -> When the two rows of "solderless pins" start pilling up errors, I will have no other choice but to remove module to fix the internals. Until then my "no moisture" RTV fix should go a long way towards reliability.
I wonder what sealant material to use (silicone?) to close the module back to factory tight.
I fear that if I open my DSM module and use RTV to shut it may leak as soon as the RTV expires
Note that the DSM uses a vent tube that is marked in WIS to be replaced. This is that weird J-hook shape. Definitely avoid driving through any standing water to prevent filling up that module with liquid.
I really wonder why such a sealed module needs a breather vent ?!?
Perhaps to evaporate moisture from the harness connector such as what we see with headlights design? Not sealed, not water proofed but moisture managed.
Last edited by CaliBenzDriver; Oct 8, 2022 at 06:19 PM.
the main point of this thread for me was to kind of get an idea of my failure and how to tackle it, since then I think I’m well footed as far as how to go about it now and got my price point on the replacement ($1000 roughly, quoted from dealer), I could probably save a lot of money and time going with a repair but it’s far too intimidating for me lmao, just wanted to thank you for your help, you may have just helped saved my ****ty w212
have a few more inquiries, anyones know what circuit 61 and 50 do?
These are the circuits designation for my engine/car M276 3.0 Turbo , M276.820
From ov00.01-p-1001-28daa, Abbreviations of signal and circuit designations for wiring diagrams. These are German DIN standard actually.
30 Battery voltage, positive (continuous positive)
30z Circuit 30, 1st input
30g Switched positive, fused
15 Not mentioned
15R Switched positive, in ignition position 1, 2 & 3
15R(1) Circuit 15R(1)
31 Return line to battery negative or ground, direct
50 Starter control (direct)
87 Input (Circuit 87)
87F Circuit 87 F (NAT control unit) *NAT in MB speak is transmission.
87M 87 Motor electronics
Have fun troubleshooting
Last edited by S-Prihadi; Oct 12, 2022 at 04:59 AM.
Hello, sorry if this is poorly formatted or not in the right thread, i own a 2011 e550 4matic with 79k miles, and just recently it’s needed to be towed to my home because the car can no longer get out of park, but it can start. I’ve read up on here quite a bit and I’m assuming my problem is the ism, and I guess what I’m asking everyone is how would I start to diagnose and mend this problem? I know it’s something I DEFINITELY cannot do myself, but I’m honestly just confused about who to send this to or where to have this diagnosed at, and if anyone knows anything i may be missing or should check before I find a repair service that’d be a plus too, thank you all for your time
After some time passed, I have gotten the car into the shop maybe 2-3 days ago for a diagnosis and a subsequent repair of the issue and I’m just waiting now. I think I’m financially prepared, and I appreciate everyone’s input on my situation. Just kind of curious, and would be grateful if anyone could share more input from previous experiences, does anyone know how long this kind of repair would take? I’m fairly certain the repairs will cost 1500 or so and as long as the diagnostics stay under 1500 I’ll be satisfied, but I’m so tired of waiting on my fun car and I’d just love an idea of how long I’m going to continue to be out of my little v8? Thanks again everyone
Cali wrote : I really wonder why such a sealed module needs a breather vent ?!?
Perhaps to evaporate moisture from the harness connector such as what we see with headlights design? Not sealed, not water proofed but moisture managed.
Dang, so that is that small hook shape hose for. I thought it was tranny oil breather hose at a glance
Even if water does not enter, road dust will be plenty and clogging it eventually..... or eventually dust into inside ISM.
Hello, sorry if this is poorly formatted or not in the right thread, i own a 2011 e550 4matic with 79k miles, and just recently it’s needed to be towed to my home because the car can no longer get out of park, but it can start. I’ve read up on here quite a bit and I’m assuming my problem is the ism, and I guess what I’m asking everyone is how would I start to diagnose and mend this problem? I know it’s something I DEFINITELY cannot do myself, but I’m honestly just confused about who to send this to or where to have this diagnosed at, and if anyone knows anything i may be missing or should check before I find a repair service that’d be a plus too, thank you all for your time
For anyone in the future trying to find the source of their do not shift gear issues and are facing similar symptoms and codes to mine, I did in fact find my error and since have had my ism replaced for $1520 and the car runs tremendously, as I understand it was a bad ground wire that was causing voltage errors and eventually a failure in the mechanism, hope everyone who reads this finds their answers!
For anyone in the future trying to find the source of their do not shift gear issues and are facing similar symptoms and codes to mine, I did in fact find my error and since have had my ism replaced for $1520 and the car runs tremendously, as I understand it was a bad ground wire that was causing voltage errors and eventually a failure in the mechanism, hope everyone who reads this finds their answers!
Thank you for sharing this interesting topic. There are so many stacked factors to produce a failure that few owner can escape this without maintenance or repairs.
✌️
Thank you for sharing this interesting topic. There are so many stacked factors to produce a failure that few owner can escape this without maintenance or repairs.
✌️
absolutely, once again thank you and everyone for your replies and participation, it was a huge foot in the right direction and I just hope that the thread can provide good reference for anyone else with this expensive sensor lol
For anyone in the future trying to find the source of their do not shift gear issues and are facing similar symptoms and codes to mine, I did in fact find my error and since have had my ism replaced for $1520 and the car runs tremendously, as I understand it was a bad ground wire that was causing voltage errors and eventually a failure in the mechanism, hope everyone who reads this finds their answers!
Did workshop said which ground wire ?
The big main one for engine block at starter solenoid from car body or ISM own wire harness's ground ?
My GLB had the do not shift error in its first week, then on the 11th month. The car was running fine after the restart and the error disappeared... MB help line was saying I shouldn't run the car as it might be the transmission, but I think mine was releasing the e-brake when I was backing up from parking. So the error was reported to MB last year, and they issued a transmission software update in March. I didn't know about the software update until the error came back second time. MB service updated the transmission software in June when I went back again. So far I didn't have the error code again... Most of the links I found for the error was saying that it is due low voltage or the transmission...
Originally Posted by Shadysideup
For anyone in the future trying to find the source of their do not shift gear issues and are facing similar symptoms and codes to mine, I did in fact find my error and since have had my ism replaced for $1520 and the car runs tremendously, as I understand it was a bad ground wire that was causing voltage errors and eventually a failure in the mechanism, hope everyone who reads this finds their answers!
For anyone in the future trying to find the source of their do not shift gear issues and are facing similar symptoms and codes to mine, I did in fact find my error and since have had my ism replaced for $1520 and the car runs tremendously, as I understand it was a bad ground wire that was causing voltage errors and eventually a failure in the mechanism, hope everyone who reads this finds their answers!
Good to hear you finally got your car fixed. I’m having the same issues as we speak. My 2011 e63 AMG broke down in the dadgum car wash. Same error “Do not shift, etc..”. 3 hours and a skilled tow truck guy later we get it out and to a shop. At first they tell me it’s some sort of electrical issue, but eventually settle on a faulty ISM.
Despite what everyone has said here, I was able to purchase the new ISM directly from the dealer myself and have it installed at a private shop. Only, I still had to get it coded at the dealer. This was done 2 days ago and the dealer gave it a clean bill of health. Fast forward to yesterday and the original shop had gone to pick it up for me to take delivery. They say after driving back with no problems, once the turned it off and started it back up it would not go into gear again. After letting the car idle for about 20 minutes it was able to shift normally. At cold start it was throwing all kinds of errors - CAN codes, low voltage, cannot communicate with shifter, etc. Once it idled the codes went away and it’s able to be driven like normal. I’ve been dealing with this issue for 1 month now. The tech is currently trying to figure out what is causing this new problem. The ISM is fixed as they are able to read data from it and shift the car with their scanner. Does ANYBODY know what could be causing this new issue? It’s looking like that’s what caused the ISM to fail to begin with.
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at a glance
or eventually dust into inside ISM.
