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My 2009 R320 Bluetec has been acting funny the past few days. Now, I'm scared.

My teen son came to me and says "the Mercedes' lights are on and I don't see how to turn them off!" I run outside and notice that only the left side high beams and both taillights are on. Even more wierd, the right rear passenger window is down. I can't turn the lights off. I can't put the rear window up. I can't even crank the car. I get my tools and get to work unhooking the battery. Once I'm into the battery compartment (under the front passenger seat) I notice there's an inch and a half of water accumulated there. I take the battery out and suction the water out with my wet-dry vac. I then take a hair dryer to the wires to dry them out.

Done, right? WRONG! I hook the battery back up and smoke starts billowing from further under the front passenger seat. At the same time, the left rear passenger window comes down! I unhook the battery and here I sit!

Where did that water come from? It could NOT have come in through the window because the back seat and carpet were bone dry. What the hell was burning under the front seat ahead of the battery compartment? What do I do next? I don't even think this thing can be towed! HELP!!!
 

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Can you give us an update about what went wrong here and how you got it fixed? My best guess is that your air inlet drain (engine compartment) got clogged up and water got into the passenger compartment through the cabin air filters. The water could be travelling under the passenger's floor carpet or even through the HVAC system.
 

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99% of the time that's exactly the cause for this - the drain gets clogged with leaves or pieces of them, water keeps collecting until it's high enough to drain into the interior via the cabin air filter and collects in all kinds of bad spots under the passenger seat. Lots of fun modules in there, also some CAN bus junctions and such, causing all kinds of havoc when getting wet/corroding.

Lay it dry, clean the drains, treat any oxidized connectors and such with some Deoxit.

--Zax
 
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