Why does the Alarm sound shortly after doors have been locked using remote key. on 1998 Mercedes-Benz ML320

This problem has started just recently and it now occurs every time the car is locked. I have tried using differnt remote keys to lock the vehicle but the alarm is set off each time.

by in Las Vegas, NV on January 31, 2013
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1 answer 2 comments
ANSWER by , February 01, 2013
sounds like you may have a faulty door ajar switch,or trunk,hood switch.
COMMENT by , February 08, 2013
You were correct. My rear passenger door lock has a faulty switch. Thank you for your help. Singlemalt
COMMENT by , February 08, 2013
Your very welcome!