I've searched other posts,but still have a problem with disabling the alarm. Under the passenger side floormat,there is a black box,about 1"x 12". I can't figure how it's supposed to open. How to get the lid off. Is there a hinge side? Once inside,what does the disconnect plug look like?? Thanks for any help with this!

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2001 E320 4matic, 2003 E320 4matic wagon