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I have a 2000 S500 with drivers door issues. First, away went the soft close feature, then it would intermittently not unlock, to a permanently not unlock. you to have to pull interior latch for door to open. Door lock button comes up, just won't unlatch. Manual key just drives electronics crazy, with even sunroof opening. All other doors fine. Any thoughts ?
 

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2005 S600
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682 Posts
You have a vacuum leak. The PSE shut down that circuit/branch.

Hook it up to a STAR and begin troubleshooting the branch that has been shut down by the PSE controller.
 

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2003 S500
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"First, away went the soft close feature..."

That is most likely to be a failure of the pneumatic actuator on the bottom of the door lock assembly - which is a pretty common failure.

"Door lock button comes up, just won't unlatch."

That is a bit unusual. If the pneumatic actuator lifts the lock knob, the door should open, as the connection between the knob and the latch is all mechanical.

"Manual key just drives electronics crazy, with even sunroof opening."

There should not be any connection between using the mechanical key and the sunroof. This sounds as if the wiring for the IR (infared) sensor in the door handle has gotten tangled up in the mechanism. When you hold the key fob pointed at the IR sensor, then press and hold the unlock button, all windows and the sunroof should open.

It is a real pain to remove the lock assembly, but it looks as if that may have to be your next step.
 

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"First, away went the soft close feature..."

That is most likely to be a failure of the pneumatic actuator on the bottom of the door lock assembly - which is a pretty common failure.

"Door lock button comes up, just won't unlatch."

That is a bit unusual. If the pneumatic actuator lifts the lock knob, the door should open, as the connection between the knob and the latch is all mechanical.

"Manual key just drives electronics crazy, with even sunroof opening."

There should not be any connection between using the mechanical key and the sunroof. This sounds as if the wiring for the IR (infared) sensor in the door handle has gotten tangled up in the mechanism. When you hold the key fob pointed at the IR sensor, then press and hold the unlock button, all windows and the sunroof should open.

It is a real pain to remove the lock assembly, but it looks as if that may have to be your next step.
"First, away went the soft close feature..."

That is most likely to be a failure of the pneumatic actuator on the bottom of the door lock assembly - which is a pretty common failure.

"Door lock button comes up, just won't unlatch."

That is a bit unusual. If the pneumatic actuator lifts the lock knob, the door should open, as the connection between the knob and the latch is all mechanical.

"Manual key just drives electronics crazy, with even sunroof opening."

There should not be any connection between using the mechanical key and the sunroof. This sounds as if the wiring for the IR (infared) sensor in the door handle has gotten tangled up in the mechanism. When you hold the key fob pointed at the IR sensor, then press and hold the unlock button, all windows and the sunroof should open.

It is a real pain to remove the lock assembly, but it looks as if that may have to be your next step.
The broken door closer element is most likely binding the door latch/lock
The manual door lock has contacts inside that signal the convenience system to either close windows/sunroof or open to vent before entering.
 

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