Question about 1999 Mercedes-Benz S-Class

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My drivers side seat belt will not retract on my 1997 mercedes s320. Can you help. If I need to replace it, how do I remove the panel. James Howard

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Sounds more as if the retraction spring would not be engaged.

There are two springs in the W140 seatbelt. The comfort spring is engaged during driving when the carkey is in the whole and the belt is fastened. As soon as you either pull out the key or press the button of the belt lock, a second retraction spring comes up and pulls the belt harder. Check this by pulling out the key with the seatbelt on. You must feel how it gets tightened, but I believe you won't.

Either the spring is broken or the electromagentic contact engaging the spring doesn't switch. If you are lucky the latter is due to a contact issue under the respective seat. Check plugs under the seat first.

Posted on Dec 29, 2010

  • Dcramer531
    Dcramer531 Dec 29, 2010

    I think also simply removing that screw removes the comfort feature and turns it into a normal belt, it's alot cheaper than getting a new one.

  • Dcramer531
    Dcramer531 Dec 29, 2010

    as far as removing the belt for replacement you must be careful, these seat belts are not an easy repair. Here are the steps for replacement.
    Adjust seat forward.
    Fold back floor mat in front passenger's footwell.
    Unscrew and remove front passenger's foot support.
    Turn ignition key to "0" position. Disconnect negative battery terminal.
    Disconnect seat belt tensioner test connection (X11/7).
    On vehicles with airbag, disconnect airbag testing plug connector (X11/13).
    Remove cover bar on entry strip, front and rear.
    Remove facing/edge protector on center ("B") pillar.
    Unscrew the 2 screws (1) at bottom of center ("B") pillar facing.
    Press in clips on center pillar facing (3) with screwdriver (arrow) and remove.
    Remove screw (4) on seat belt bracket and nut (5) on upper belt guide fitting.
    Disconnect plug connector on seat belt tensioner ignition capsule (R12/1, R12/2) as well as seat belt comfort facility.
    Press automatic seat belt rewinder downwards and remove from center ("B") pillar.
    Before taking any covers off would recommend at least disconnecting the battery. The seatbelts have pretensioners in them. These are explosive charges that retract the belts rapidly in the event of an accident. Just like working around the airbags, it's a good idea to disconnect the battery.


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