If you're having comfort access issues, check the module in the trunk. I haven't gone digging for it in my E70 X5 yet (so I cannot tell you exactly where it is) but in my E82 1er, it's in the passenger side of the trunk under the trunk liner. You need to check and see if it's filled with water. If so, it's most likely your comfort access issue. I doubt this will keep the car from starting though.
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