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Mercedes S-class S500 Questions & Answers
My 2006 s500 mercedes benz won't start after going through car wassh
Your fuse box is mounted in a bad location the water runs down between the wiper cal or fender and hood into the fuse panel getting the connections wet try placing a piece of cardboard over the fuse box under the hood and see if that lets it start. It may be missing a rubber molding or even could be getting the connections wet to your computer located in the fire wall
Free mercedes wiring schematics
You are probably going to need to go to the dealer to get the computers re-initialized. When batteries are replaced in this vehicle, there needs to be a continuous supply of power to the car's computers or what you experienced will happen. Auto parts stores sell a simple device that uses a 9V battery to power they computers through the 12V power port (cig lighter). That 9V is sufficient to keep all the systems running and synchronized properly for the duration it takes to replace the main battery.
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