My 86 will lock/unlock days after it was shut off - I can hear an electric vacuum pump operate whenever I turn the key in the latch to "unlock" - but I have no idea if that applies to the 123 or the earlier models.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL