722.9 conductor plate electrical connector snapped!!!!!!

[renrutp76]

Hi,

I have a 2005 W211 E500, it hasn't moved for a long lime due to having brought a few new cars since. My latest car is currently in for a replacement turbo which will take a while so after a week or two of hire cars, I thought I would do a few small jobs and get it through its MOT. thought there wouldn't be too much to do, but boy was I wrong!!!! Discs and pads all round, 2 new ABS sensors, Battery control module, Bi-Xenon ballast for starters. did all those bits and took for a road test only for the gearbox to start hard shifting and then limp mode. I remember the reason I retired it in the first place was due to gearbox gremlins (which a service didn't resolve. It has had a 200A fault since I bought the car 10 years ago but this was never an issue. I am on the original conductor plate as this is the earliest variant of the 722.9 gearbox, and due to the rough shifting, everything I have read online pointed to the conductor plate needing attention. I found a place that would refurb meaning no additional coding, or messing with Mercedes TRP forms, so today I drained the system and removed the valve block so I could post the conductor plate, but as I was "teasing" the valve block out of the housing, the electrical connector snapped off the conductor plate (I had previously unplugged the external electrical plug). It then took 20 minutes of teasing to remove the remains of the plug from the housing. does anyone know if this can be repaired or can the coded part of the plate and solenoids be swapped with a donor plate?

any help would be much appreciated!!!!!

 

[Wighty]

Hi,

I have a 2005 W211 E500, it hasn't moved for a long lime due to having brought a few new cars since. My latest car is currently in for a replacement turbo which will take a while so after a week or two of hire cars, I thought I would do a few small jobs and get it through its MOT. thought there wouldn't be too much to do, but boy was I wrong!!!! Discs and pads all round, 2 new ABS sensors, Battery control module, Bi-Xenon ballast for starters. did all those bits and took for a road test only for the gearbox to start hard shifting and then limp mode. I remember the reason I retired it in the first place was due to gearbox gremlins (which a service didn't resolve. It has had a 200A fault since I bought the car 10 years ago but this was never an issue. I am on the original conductor plate as this is the earliest variant of the 722.9 gearbox, and due to the rough shifting, everything I have read online pointed to the conductor plate needing attention. I found a place that would refurb meaning no additional coding, or messing with Mercedes TRP forms, so today I drained the system and removed the valve block so I could post the conductor plate, but as I was "teasing" the valve block out of the housing, the electrical connector snapped off the conductor plate (I had previously unplugged the external electrical plug). It then took 20 minutes of teasing to remove the remains of the plug from the housing. does anyone know if this can be repaired or can the coded part of the plate and solenoids be swapped with a donor plate?

any help would be much appreciated!!!!!

Eeek !
Might be worth a photo of the damaged area ?

 

[renrutp76]

The whole connector remained in the socket of the housing. once removed, there are 2 orange O Rings, then at 90 degrees is the external connector. On the conductor plate was just the ribbon cable underneath the connector seat. It looks like the black plastic had become brittle, unless it had been removed previously.....

 

[Oldspanners]

I would contact the place you found to do the refurbishment and ask their advice.

 

[alexanderfoti]

This can happen, you have to push the connector out from the above whilst dropping the valve body as they dote get bound up on the connector. A repair would be very difficult, it would probably be easier (cheaper) to replace the tcu.

 

[renrutp76]

This can happen, you have to push the connector out from the above whilst dropping the valve body as they dote get bound up on the connector. A repair would be very difficult, it would probably be easier (cheaper) to replace the tcu.

The external connector was disconnected, the socket was really stuck in the housing. I watched a lot of youtube tutorials on removal, but every one seemed to come out with a bit of gentle persuasion.... I gave it a gentle wiggle for a few mins but heard a crack, then the unit came away minus the plug.... I contacted Essex Recon and they said to send the whole thing and they will take a look. new TCU from Mercedes, plus transport cost to get to a merc specialist/dealer then coding cost is more than the car is worth... car has 185k on, but has sentimental value otherwise would have scrapped it a long time ago!!! I will update once they inspect it....

 

[renrutp76]

Just had a message from Essex Recon that the conductor plate had been repaired and shipped, I will let you know if the repair works!!!

 

[Wighty]

Just had a message from Essex Recon that the conductor plate had been repaired and shipped, I will let you know if the repair works!!!

I’m sure if it’s being refitted to a shiny car then it will work perfectly .
Good luck just in case .

 

[renrutp76]

I’m sure if it’s being refitted to a shiny car then it will work perfectly .
Good luck just in case .

conductor plate came back repair wasn't perfect but told functional. Reinstalled and during warm up/level check, shifting was no longer jerky from D-N-R and back, however new issue has arisen!!!! The car came with star diagnostic, which I have always used for fault reset and live values etc... this will no longer communicate. My girlfriend has a 2016 SLK and it works fine on that... getting the error attached. other than gearbox TCU, I have also replaced the BCM in the boot.... any ideas? I will check all fuses in the meantime.. Think I also need to replace the aux battery although not sure this would be affected... It was working fine last week as I was trying to diagnose a speed sensor issue.

 

[alexanderfoti]

Dodgy mux, or cable, or computer cant talk to the mux

 

[renrutp76]

Dodgy mux, or cable, or computer cant talk to the mux

laptop and MUX talks to SLK......

 

[alexanderfoti]

Another tool work on the W211?

 

[renrutp76]

Another tool work on the W211?

After leaving battery disconnected overnight I connected a Bluetooth scanner. I established comms, but didn't see ECU or TCU.... then tried Star again which connected but again no ECU or TCU....., now no comms again

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[alexanderfoti]

Central Gateway dying then

Check it's not full of water

 

[renrutp76]

Central Gateway dying then

Check it's not full of water

Thanks Alex, Is this a coded part or can I just get an Ebay spare?

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[alexanderfoti]

You could also have a can fault so do test all before hand. What modules show up on a full scan.

 

[renrutp76]

You could also have a can fault so do test all before hand. What modules show up on a full scan.

Replaced the Aux battery and gave the main battery an overnight charge and now have comms with ECU and TCU.... car shifts well but have an ABS issue. I replaced the sensor and fault remains. rotated the wheel with an abrasive plug to clean corrosion from outer hub but this didn't sort it. from the live values, there is an intermittent fault (reading drops to 0 kph every so often). Think I need to replace the hub, or can the magnetic ring just be replaced?

 

[alexanderfoti]

Just the magnetic ring

 

[renrutp76]

Just the magnetic ring

Thanks, just watched a YouTube video, looks like it can be a pig of a job!!!

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[Trev1964]

Thanks, just watched a YouTube video, looks like it can be a pig of a job!!!

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I p/x'd my first C207 because it needed that doing. Really didn't fancy doing it.