99 (w140) s500 driver side door does not unlock with remote
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Newbie
Joined: May 2020
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99 s500
99 (w140) s500 driver side door does not unlock with remote
My remote can lock the whole car but when I unlock the car all doors will unlock except the driver door. I would have to manually unlock it with the key.
Newbie
Joined: Oct 2019
Posts: 9
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1997 S320 SWB
Driver's door won't unlock
Things could be much worse! The Mercedes W140 central locking system basically has two parallel circuits. One accepts command "lock all" and the other "unlock all". This can be from the IR remote sensors, or from physical switches in the driver's door or at the trunk/deck lid keyswitch, which ties into the same system. Your central locking system is responding to the "unlock all" command seen by the IR sensors. The driver's door vacuum actuator is not performing, most likely due to a vacuum leak in the line between the actuator and the pump. Tracing the leak is a job for either a DIYourselfer with a good understanding of the system, or a pro. Not necessarily a dealership pro. Since the system will lock the driver's door, the pressure/vacuum actuator probably is OK but the control unit has locked out the "unlock" function for that particular door. Try removing and reinstalling F#9 in the rear fuse box [in the luggage compartment, to avoid "boot" vs "trunk" issues] and see whether that resets your system. If that doesn't help, I suggest you find an independent repair shop willing to chase the problem!
Newbie
Joined: Oct 2020
Posts: 5
Likes: 1
Mercedes S320 1995
I have a weird problem with that vacuum pump (PSE), when i put the car in reverse, the trunk lid pop out, but the assistant antennas for reverse dont come out. I never replace that vacuum pump, so the hoses are in their respective places..
