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I just read this on a repair website:
Mercedes-Benz key fob not working? The first thing you need to do is change the keyless remote battery. We assume you have already done that part by now. Is your Mercedes key fob not working after a battery change? This article will help you troubleshoot problems where the Mercedes key fob doesn’t work or no longer unlock/locks doors or trunk. In most cases, the key can start the car but not work as a keyless entry remote. Generally speaking, when Mercedes key fob is not working, it’s because either because the key is defective or the All Activity Module (AAM) is not recognizing the key signal, or it is not receiving signal due to an antenna issue.
Anyone know where the AAM is located?
EDIT: I found it's location, but it is very complicated to repair, and replacement requires other VIN specific modules to be replaced as well ($$$$$$$$!!).
Last edited by ROLLGUY; 10-19-2017 at 11:20 AM.
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