General Information
General Information:
In states/areas where required by law the airbag and belt tensioner units must be rendered unusable by electrical ignition before scrapping, in accordance with local/state laws. These safety measures are essential because any improper activation of these pyrotechnic devices may result in injury. Dangerous situations arise, e.g. when scrapping with the aid of cutting torches, when melting down or if components still charged are placed in flames or smoldering fires at refuse dumps.
In order to avoid an additional workload arising from compliance with these safety measures, Mercedes recommends passing the pyrotechnic devices for scrapping to a scrap dealer who will perform the necessary safety measures, if allowed by law. On acceptance, the scrap dealer may be required to sign a declaration obliging him to scrap pyrotechnic devices in accordance with the accident prevention regulations.
When agreements of this sort are made, it is however essential to ensure that it is impossible to remove pyrotechnic devices from the scrap to be passed on for repair work. For this reason, they must be rendered unusable for reconditioning by means of ignition. This requires an ignition device developed by MB, with which the pyrotechnic devices can be rendered unusable in complete safety.
Check whether the vehicle is equipped with belt tensioner or airbag and belt tensioner unit
1. Belt tensioners can be recognized by the symbol "RS" on the buckle latch.
2. The driver airbag unit can be recognized by the inscription "Airbag" or "SRS Airbag" on the steering wheel upholstery.
An additional feature to aid recognition is the warning lamp in the instrument cluster bearing the inscription "RS" or "SRS".
USA version "SRS" (as before).
Checking Removed or Individually Supplied Belt Tensioners and Airbag Units and Triggering if Necessary:
1) Turbine Tensioner: Check closing plate at tube end (arrow) for damage. Trigger turbine tensioners not damaged at the tube end as described in item 3.
2) Belt Tensioner (Cable Tensioner): Remove protective rubber cap on end of tube and determine distance "X". To do this, insert a round instrument or a screwdriver of approx. 10 mm diameter and measure the depth. On model 107/123 distance "X" should be 140.0mm ± 5 mm. If the distance measured is shorter than this, the belt tensioner has been triggered.
Modified Versions:
As of 01/86, there is an observation window (arrow) in the housing of the belt tensioner, through which the cable is visible. It is therefore no longer necessary to remove the belt tensioner from the vehicle to perform this test.
If no cable is visible, the belt tensioner has been triggered.
As of 08/87, belt tensioners are supplied by two manufacturers.
The housing of Autoflug belt tensioners is also fitted with an observation window through which two cables are visible. Autoflug belt tensioners where only 1 cable or no cable is visible have been triggered.
3) Lay any belt tensioners which have not been triggered in the footwell of a scrap vehicle and directly connect the 2-pin coupling. Trigger belt tensioner as described, Use of Triggering Device.
4) Airbag unit: If the cushion on the airbag unit is not ruptured, the airbag unit must be triggered with the aid of the 2-pin coupling, Use of Triggering Device.
Triggering Device:
1 Battery charge indicator lamp
2 Battery check pushbutton
3 Pushbutton for triggering
4 Rotary knob
5 Triggering indicator lamp
Triggering airbag and belt tensioner units: In order to trigger belt tensioner units via the 4-pin coupling, a separate adapter cable, part no. 124 589 29 63 00, is required. This part is not included with the triggering device, part no. 126 589 00 90 00.
Self-Made Adapter Cable:
Number Designation Part No.
1 Plug, top section 009 545 21 28
1 Plug, bottom section 009 545 52 28
2 Plug pins, dia. 4 mm 001 545 38 26
2 Plug pins, dia. 2.5 mm 011 545 16 28
1 Plug 012 545 56 28
0.3 m Mains cable Commercial
In order to trigger the belt tensioner units (modified triggering logic as of 09/87) by means of the test coupling/plug connection for airbag (X29/9), a separate adapter cable, part no. 126 589 21 63 00, is required. This part is not included with the triggering device, part no. 126 589 00 90 00.
The adapter cable must be connected to plug connector 6 of the triggering device and may be used for all vehicles delivered to date.