This is not a big deal really, but was wondering if this was an easy fix. I do have an aftermarket alarm system on my car that operates the door locks as well, if this might be related. Well my doors unlock fine whenever I use the remote only, they do not unlock from the switch on the console. Also, when I open up any front door from the inside, all doors should unlock, but they don't. Whenever I push the button on the console to lock doors, it does it everytime, as with the remote. But when I turn the car off, the doors always unlock.
So my problem is is that the doors do not unlock when the console unlock switch is pushed, nor do they unlock when (when doors are all locked) one of the front doors is opened. But sometimes, 2% of the time, it will work. I test it every now and then. And it will work as many times as I try it. But then when I think about testing it again later, it NEVER works. Any clue????

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)