Interesting issue I'm having, what can it be?

tonytek

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hello everyone, im new here and sorry to come in here and immediately ask for help...

2011 c300
4 months ago I had a clog drain on moonroof, lots of water got in and flooded the driver side carpet.
I dried it off as best I could and continue to drive as normal,
this week coming out of the gas station I hit not a bump but a drain area causing my car to violently bottom out but no issue, I drove for about an hour and then the abs light turned on, then I noticed my turning blinker, horn, highbeam and wipers did not work.
I got home turn the car off, turned back ON with no starting issues but still no high beams, wipers and all that.
after googling I removed the carpet and found that the CanBus rails connectors were looking corroded. I had the car on position 2, tuen the blinkers ON and moved those CANBUS wire around to see if I caould get the blinkers to work... the blinker started to work but quickly stopped.
I then tried to start the car and I had no power to in cluster besides the main center light on the gauge but none of the ignition lights came on. they key did turn but no power at all.
Also no clicking noise that u get when u insert or remove the key... its as is the SAM is not sending any power...

trouble shooting all night I noticed that with the key on position 2 If I go remove relay N (engine circuit 87 relay) and then remove fuse 27 they put back fuse 27 I get power and my cluster lights up (remember key was left on position 2) I then put back relay N and all seems normal..
I go and try to crank but nothing.... BTW if I took key out and go to position 2 again it reverts to no power.

I went to the dealer and got all 3 CANBUS connectors and replaced them
I got my blinkers, horn wipers and all that back but still not power to the cluster.
so I did the same thing pulling the relay and fuse again to get the cluster to work with key in position 2. but still I tried to crank and nothing, no clicking or nothing...

so I then went and ran a battery positive wire to the starter relay and car turns ON right away.
I drove it to work today 40 miles one way audit ran normal. not even a check engine light.
I got to work turned it off and obviously back to no power so had to do the same to turn the car on again after work.

what I have noticed.
relay N continue to randomly click ever 1-2 minutes with car off and doors closed.
when I put the key out of ignition I here 4-6 light clicks coming from behind the cluster and then it stops.

I tried replacing the starter relay with an old one that I had, its not for this car but the prongs and diagram matched up, when I did this the starter fuse blew....
not sure if this happen cause its a bad or wrong relay or the original one is bad and with the other one it points to a new problem....

also My overhead controls and moon roof stopped working, along with the glovebox light from the original issue.

there, now if u have the time to read all this then u know as much as I know lol

Thanks, and advice is welcomed...

Tony from Central FL
 

barry jones

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Tony

It sounds like you may still have an issue with water ingression in either a relay or connectors... did you take any photos showing before and after and of what components you have replaced?

Modern cars do not like water in their electronics. Many of the modern components can have circuit boards inside that are microns apart and if water gets into them, capillary action can see it spread inbetween and sit there and you have no way of getting it out again.

I remember having a 1990's Ford that was really prone to getting water in the main fuse box if you left the battery cover off (It sat alongside the battery and was open to the elements without the cover) The fuse box was made up of about 20 very thing layers of copper and taking one apart was a mammoth task. I took one apart after it had been supposedly dried out for two months and there was still water sat between the layers causing shorts and all manner of issues
 
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tonytek

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hey Barry, I just did a video on my issue explains what happen and what's going on
 

barry jones

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hey Barry, I just did a video on my issue explains what happen and what's going on
OK a couple of things.

  • Have you had it put on a STAR diagnostics yet? Because sometimes, if a function is impaired and triggers a fault and a resulting fault code, the system will need resetting before it would function again (Usually things like airbag lights etc cause this, - I had to reset fault codes when I swapped seats in a W221 as the warning lights and fault codes did not reset automatically)

  • How much water was actually in the footwell when you discovered it?

  • Is there any water in there now? (It looks on the video, like there is still a small pool showing on the white floor metal)

  • Was it just confined to the drivers footwell?

  • Are you sure it was a blocked drain to the moonroof/sunroof?

  • Where did the water actually enter and did it run past or over any other electrical stuff before hit pooled in the footwell?

I'm just trying to establish if it is just a case of it needs resetting on STAR now that you have changed the CAN connectors or if there is still an issue elsewhere. If it is the latter, I would argue that there is still a component suffering from water immersion

The cable from the battery to the fusebox thing is just by-passing the ignition circuit and putting a feed directly onto the starter motor I imagine, a bit like hot-wiring a 1980's Ford Escort :) so just because it starts, doesn't rule out any issues
 
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tonytek

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yes I did scan it with a bluetooth scanner and was able to lear the airbag and other codes however still getting
-The inner stop lamp and tail lamp is faulty. A short circuit to battery (+) or an open circuit exists.

-communication with the left rear door control module is faulty

the fist one is just a bulb that is out, I confirm this by swapping bulbs.

there is no water its dry, why u see in the video may be reflations.

yes im sure it was a blocked train, after clearing it water was no longer coming in.
water was tripping from the moon roof towers the from left pillar between driver window and windshield
then dripping down by the emergency food brakes.
was plenty of water where it formed a puddle.
and also accumulated in the back floor driver side.
seats work fine.


I don't know if I mentioned that while recording the video I was showing how you insert and turn key but nothing happens but for some reason ignition did turn on and car started normally, turned it off with a confused reaction turned it back on and it works then turned it off a 3rd time and tried again but now back to no ignition light or key click indicating that car accepted the key.

today I looked at all wires under driver side door and all seems fine.

they only fuses I found were under the hood and trunk right side. no fuses on driver side as other cars.

so still wandering what to do.

and why does relay N keep clicking like ever 45 seconds or every 3 min its just continues to randomly click.
 
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tonytek

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still dealing with this issue and can't figure it out
 


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