I own a 1991 300E 4Matic that is having alarm issues. The alarm goes off for seemingly no reason. I would like to disconnect the alarm. The area underneath the passenger footrest looks exactly the same as the picture attached to the first message.

In order to disconnect the alarm, do I need to first disconnect the battery? Also, as far as I understand from the above postings, I just unplug #2 and #3 referenced in the above picture, and the alarm is disarmed, correct?