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Mercedes-Benz
S320
71

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: 133,153 (40,000–273,000)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
71 people reported this problem
Comments
Viewing 1 - 20 of 34 comments
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
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
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.
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
Drivers door will not close all the way. Other doors and trunk will pull down about 3 times and then stop. I have to pull the fuse in the trunk and plug it back it then they will work again for 3 more times then stop again.
DOOR LOCKS WILL NOT UNLOCK-MAINLY DRIVER'S SIDE REAR. TRUNK WILL NOT OPEN SOMETIMES WHEN INTERIOR SWITCH IS DEPRESSED. PNUEMATIC MOTOR REPLACEMENT.
can luck doors using the main power luck. Can open the trunk from inside and I do not hear the pneumatic system working