Engine won't turn off after removing key

Davie Murphy

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Mercedes E Class CDI 2.7 2005
Hi all, just recently joined in hopes someone else has experienced this.

I recently bought a 2005 E Class 2.7 CDI, very nice car for year and has been running great in general. There was an issue where I was getting error message 'battery convenience functions unavailable.....' so I replaced the battery with a brand new one.

Then one week later, I pulled into home and turned key to 0, removed it and the engine was still running, with the new 'SRS' error message running alongside the battery one. (I was pretty confident the message was displayed in error). I removed a plug from the circuit cluster to kill the engine. From that point it ran absolutely fine everyday, no warning lights/messages on the dash at all. I decided to finally get it checked over at a regular garage I use often. Basically all they done was reset the ECU and clear all messages but again, ever since, no problems, no warning messages.

Then yesterday, I washed it and when I got home, same thing, engine would not switch off. SO I remembered that on the first occasions it was raining heavily. Is there any known issue whereby water is getting in somewhere and causing this or is that pure coincidence?

Any help would be much appreciated.
 

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No vacuum shut off on this car.
 

Westheath

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Make sure the fuse box covers not broken and is able to close fully.
 

Mark A

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Not sure about the E, but had similar issue with my ML when water got into the rear SAM.
 
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Davie Murphy

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Not sure about the E, but had similar issue with my ML when water got into the rear SAM.

Yeah I am thinking that it is related to water getting in somewhere. Apologies for my lack of knowledge but what exactly is the rear SAM and how do I check this for water?
 

Mark A

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SAM stands for Signal Acquisition Module. It receives data from sensors, switches, and controllers, and can send data, actuate (activate) components and monitor systems. There can be more than one in your car. If you do a search online, it should indicate how many and where they are on your car.
 

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