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A water leak into the rear SAM module can be a common problem in a W164 chassis. Detecting where it comes from can be a lot harder. In this case it was coming from a crack in the back of the sunroof drain container before it reaches the drain tubes. As a result, the water leaks from the headliner all the way into the rear of the car on to the SAM. It can be tricky tracing the spot where its coming in, hopefully this can help some people with this issue. It can also apply to potentially other Mercedes SUV leaks.
I use iCarSoft for diagnosing Mercedes issues which lets me connect directly to modules in the car and avoid using the dealer to pull codes. It paid off for me in the first use after I purchased it.
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