E320 cdi - Water spilt down centre console/gear stick - Gearbox stuck in 2nd

E Class Man

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Hi
Last weekend packed up sailing dinghy sail in pouring rain and placed rolled up sail in my 320 cdi estate (W 2000 Reg - W210). Unknown to me at the time, and whilst packing up the rest of the boat stuff, rain water in the sail was steadily dripping onto centre console around gear stick.

Initially car wouldn't start and most warning lights were on.

On realising what had happened I mopped up water and removed trim and winter/summer (W/S) rocker switch to reveal a lot of water underneath switch and on top of the circuit board below.

After mopping up further, car started with fewer warning lights and I drove home with gear box in 2nd (limp home mode) where it has remained since.

After more drying out I tried to remove the whole assembley from the car to dry it properly by removing the the 3 allen headed bolts securing the base of the whole unit to the transmission tunnel. This unit appears to be attached by some linkage underneath. So I didn't force it, I just bolted it down again. There is a muiltipin plug connector on the front of the gear stick unit which may well have got wet but I can't remove the connector as it is too inaccessible and again I don't want to break it. Have left it for 24hrs with an electric fan heater running on the area to dry it out properly.

Engine now starts fine and no warning lights displayed or malfunction messages. However The park P display remains displayed irrespective of lever position and gear box is still only offers park, 2nd gear or reverse.

Also the solenoid lock which prevents movement from park when foot not on brake works as required but stick cannot be moved from N to R unless foot is OFF the brake ????? I don't understand this one!!

Questions:
1/ Can any one give some help to get my gearbox working again?
2/ Should I remove the 4 star headed bolts and try to remove the top of the unit from above its baseplate or will 1000s of bits fall out which I'll never be able to reassemble?
3/ Can the gear stick unit be dismantled any further in situ? If so how?
4/ How do I get the connector plug apart without damage? I can't feel any catches on the plug.
5/ Does the fact that the W/S rocker switch seems to have no metal conntacts under it matter? Did loose a part of this when I removed it at the sailing club?

All help gratefully received.

E Class Man
 

television

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Ok if you are sure that it has dried out, A warm air pistol is good for this, disconnect the battery for 10 mins, and with luck it will clear itself, let us know what happens.

Malcolm
 
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E Class Man

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Just done that and no change to the gear box situation, however I now have ABS and BAS lights on as well!!

ECM
 
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Parrot of Doom

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You'll have to remove it completely and open it up to dry out. Otherwise that water will never get back out. It will be sloshing around inside the white plastic box that houses the circuitry and lighting for the gear selector.

Heres the thread that shows you how:

http://mbclub.co.uk/forums/showthread.php?t=6722&highlight=switch

When you lift the unit out, make sure you catch hold of the linkage at the bottom - you don't want it to drop into the car. Tie something around it and secure it to something safe, a bit of strong nylon string or something. The whole thing will take you a few hours.
 

124coupe

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The wet module is the SCM and, if replaced, needs VIN coding by the stealer :)

If it dries out and is still alive, cycling the key should reset all warnings.....

As you are getting random results, I would suggest it is still wet?
 

124coupe

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I meant the ESM (electronic selector module).

Posting & working at the same time :)
 

Parrot of Doom

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It should still work perfectly. Things only tend to die after water has been there if the water contains contaminents, like sugar for instance :)

Once everything is dried out, including the insides of any switchgear, it should be perfectly fine.
 
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E Class Man

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Good news. A bit more drying and I've now got the P, R, N, D and tiptronic 1,2,3,4 displayed on the dash on selection of the lever.
Took it for a drive and it started off perfectly, changing up and down, then after a bit of hard accelerating and braking it jumped from 1 to 3 in the change up and 3 to 1 on slow down. Still a bit of water sloshing about I suspect.
It's looking good so more drying and hopefully it will resolve it self.
Keep your suggestions coming.

ECM
 

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E Class Man said:
Good news. A bit more drying and I've now got the P, R, N, D and tiptronic 1,2,3,4 displayed on the dash on selection of the lever.
Took it for a drive and it started off perfectly, changing up and down, then after a bit of hard accelerating and braking it jumped from 1 to 3 in the change up and 3 to 1 on slow down. Still a bit of water sloshing about I suspect.
It's looking good so more drying and hopefully it will resolve it self.
Keep your suggestions coming.

ECM
Have the heater on max and downwards while you are driving around.

So pleased it OK

Malcolm
 

television

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I am sure that the gearbox ECU is just under there to the left and up a bit.

Malcolm
 
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Glenn Smith

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E Class Man said:
Just done that and no change to the gear box situation, however I now have ABS and BAS lights on as well!!

ECM

You need to reset this light by turning steering from lock to lock, this normal and will happen any time the battery is disconnected
 

ribby

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How's it doing now....

Good news. A bit more drying and I've now got the P, R, N, D and tiptronic 1,2,3,4 displayed on the dash on selection of the lever.
Took it for a drive and it started off perfectly, changing up and down, then after a bit of hard accelerating and braking it jumped from 1 to 3 in the change up and 3 to 1 on slow down. Still a bit of water sloshing about I suspect.
It's looking good so more drying and hopefully it will resolve it self.
Keep your suggestions coming.

ECM

How's it all now?
 

television

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How's it all now?

with a bit of luck once it dried out it was OK, sadly not that many post back no matter how much help that one gives.

Malcolm
 

ribby

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ALL

Does anyone have any further ideas on this....

a very small amount of condensation dropped onto the centre console, and now locked into limp home in 2nd... (slight confusion is that the Fan Belt went at the same time! - Now fixed)

I have dried this area well, and removed the window switches etc.

disconnecting the battery for 10 mins has not had any effect...

So, I think either:-

- It is dry and OK, and I need to find a different way to 'reset' to remove the error
- it is not yet dry
- the gear selector is dead

any thoughts?

Thanks in anticipation
Peter
 

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ALL

Does anyone have any further ideas on this....

a very small amount of condensation dropped onto the centre console, and now locked into limp home in 2nd... (slight confusion is that the Fan Belt went at the same time! - Now fixed)

I have dried this area well, and removed the window switches etc.

disconnecting the battery for 10 mins has not had any effect...

So, I think either:-

- It is dry and OK, and I need to find a different way to 'reset' to remove the error
- it is not yet dry
- the gear selector is dead

any thoughts?

Thanks in anticipation
Peter

The brake light switch can cause this. can you put up the first 6 VIN numbers WDB210---


Malcolm
 

ribby

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Malcolm/All

Sorted! - I bit the bullet today and visited a dealer!

They printed out 10(ish) pages of errors (it's not been plugged into a dealers computer for more than 3 years (132,000 miles!), then they reset it, and printed out one status page.

The result is that there is a potential problem with the Gear Selector unit - but have recommended to 'see how it goes', ~£270 (+labour and VAT) if wanted/needed, and have one in stock.

Then, the bill, £35. I was absolutely gob-smacked!

Thanks to MB of Harrogate - maybe not all dealers deserve the 'Stealer' name! - This was a very nice change, and maybe look to use again...

Regards
Peter
 

television

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There is a complicated switch within the selector,water and moisture can hang around a long time,It would appear to be drying, you will be ok shortly,a good drive would be one of the best things to dry it out.

malcolm
 


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