Mercedes-Benz 300 SE 1989 Owner's Manual page 30

Opening the Doors
From outside: pull handle (1)
outwards.
From inside: pull handle (4) in door
trim panel.
28
Locking and Unlocking of Doors
From the outside: turn key.
From the inside: actuate door lock
button.
2 Unlocking
3 Locking
When the rear d o or lock buttons are
down, the rear doors cannot be
opened from the outside or the
inside, unless the door lock buttons
are firs t pulled up.
The drive r's door can be locked only if
it is closed and the door latch has
properly engaged.