That somehow does not compute. In 93/94 the trunk handle was re routed to the "close assist" pump in a service bulletin. The whole upper actuator was replaced, a microswitch on that was bypassed, and a "t" was put in the line of the "close assist". I assume the port was capped, previously the "draw in" of the handle was handled by the "locking pump" under the rear passenger seat. That pump handles lock/unlock, lumbars, HVAC backup vacuum, rods if you got them, and vacuuum headrests if you got them, and of course the handle prior to the mod, and I think in later models (95?) controlled the trunk remote release.
I would suggest getting the 140 DVD (92-99) from Mercedes if you plan on working on the car. it is good not great but has wiring and service info $150 or so.

Hmm, I can only tell you how it works on my car without the 883 code
(no Close Assist). The black line from the PSE pump, under the rear seat
handles both flap unfold/retract and trunk release. I guess the trunk release
is followed by the unfolding of the flap driven by the same pressure
(or vacuum?).

br,
syljua (wanting to buy retrofit kit 1407500584, but oh, so expensive...)

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1998 CL500 W140
1984 230E W123