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Join Date: May 2017
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Solution to alarm going off with key unlock
I bought my 300C new in 2005. Now both of my key fobs are dead (new battery didn't work). After reading all the posts, I tried something that seems to work. First I lock the car using the button on the driver door. Then I pull the lock button up to unlock the driver door. Then I lock the door with the key. When I unlocked the driver door using the key, the alarm did not sound when I opened the door. However, I did not wait any amount of time prior to unlocking the door, so if there is a time greater than a few seconds before the alarm detection is turned on, it may not work. Will try later.