Closing Assist/Door Lock Issues Due to Pneumatic System Problems on Mercedes-Benz S320

Problem Description and Possible Solution

Problems with the pneumatic system can cause closing assist and door lock issues.

Problem Data
RepairPal Verified
Average mileage: 133,847 (40,000–273,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
58 people reported this problem
Viewing 1 - 20 of 32 comments
AUTOMATIC LOCKS DON'T WORK AND CAN'T LOCK DOORS USING CENTRAL LOCKING SYSTEM
I have to manually push all rear and passenger doors locks down. Then use the ignition key to lock the driver's door. I got to manually slam the trunk down and then lock trunk w/ ignition key.
Easy fix for this problem. Access pump at back of trunk and check air lines for tighness. Can adjust amount of tension applied to doors and trunk. Search web for exact fix but very easy fix.
can not unlock any door. levers only go up half way but not fully up it almost feels like not enough air to push em up. trunk opens fine
Closing Assist, drivers Door Issues Due to known reason.
Intermittent door/trunk closing assist. Found that pulling fuse and re-installing would resume proper function. Currently researching specific cause. Suspect relay or switching device in system.
power locks don't work and trunk,Closing Assist/Door & trunk
door locks dont work with key or button trunk wont open with button inside car rear backup bars in rear quarter pannels wont go down
3 doorlocks do not open close with remote
need to manually open
seats dont move
rear view mirror doesnt move
trunk lid tongue remains stuck in out position
Problem began with a battery that does not hold a charge.
my central locking system is not working, I have to unlock the doors manually.
My locks are not working except with key or manually, and the lil piece on the trunk won't go in
door lock or unlock not work but light work
DOOR LOCKS WILL NOT UNLOCK-MAINLY DRIVER'S SIDE REAR. TRUNK WILL NOT OPEN SOMETIMES WHEN INTERIOR SWITCH IS DEPRESSED. PNUEMATIC MOTOR REPLACEMENT.
Doors will open atfer being unlock with key or remote
Door locks activate when (only door lock) opens and closes all four locks.
I have to manually lock and unlock all doors. Then use key to lock drivers side door.
Just quit on me. Have to unplug the fuse every now and then to close the trunk properly.
The key fob would open and close the door locks but stopped working. I replaced the battery in key - no luck.
Have to push down on other door locks - use key to manual lock drivers door. Trunk does not open nor does gas cover open.
Right now unable to put gas in car.