Both my 92 300CE and my girl friend's 99 ML320 are set to lock very soon after starting out ... this is a safety feature that can be set or unset on a lot of these cars ..... not a bad approach really, especially when driving in less than safe areas -- at night, etc etc. If you like the alarm system otherwise, you can have the locking pattern changed by a knowledgeable MB tech.

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)