Scott,
Thanks for the reply and troubleshooting tips.
I have discovered that the rt front door locks and unlocks the car but does not arm or disarm the alarm system. It's getting dark here in Boston now but I will be removing the door panel and checking the wiring as suggested tomorrow, weather permitting. I'll let you know how I make out.

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72 350SL #69
73 450SL Parts Car?
78 450sl Parts Car
79 450SLC - Sold
1985 280sl
87 190E 2.6 - Donated
90 300E-Junked
97 E420