W126

1983 300SD vacuum locks but not unlock

I have gone through the vacuum lock lines and tested each door to make sure I dont have a leake. The doors will all lock when the drivers door is pushed down from inside or with the key. But will not unlock the other 3 doors when the drivers door is opened. The trunk lock holds vacuum but does not unlock other than with the key. When I push the drivers door down the motor in the trunk comes on and goes off. When the drivers door is opened (lock pulled up) is the motor in the trunk to come on and push air to the other 3 doors to unlock them?
Thanks for your help Jim Hunt.

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