695819 Removing and Installing Driver's Airbag Unit
WM 695819 Removing and installing driver's airbag unit
Preliminary work
Preliminary work for removing and installing driver's airbag unit
Information
Operate the steering wheel with the battery disconnected. Before disconnecting the battery, observe the following points:
1. Ignition key into ignition, switch ignition on and off again.
2. Leave ignition key inserted.
3. Disconnect battery. => Work instructions after disconnecting the battery.
Removing driver's airbag unit
WARNING
Incorrect handling of airbag units
- Triggering of airbag unit
- System faults can occur
-> Switch off ignition and remove ignition key.
-> A voltage supply (e.g. battery charger) must not be connected to the external power supply/jump-lead starting terminals.
-> Disconnect the battery and insulate the ground strap so that all contact with a ground carrier is avoided.
-> Wait 1 minute after disconnecting the battery.
-> Only pull off connector on the triggering unit after the waiting time has elapsed.
-> Make sure that no foreign objects are located in front of the airbag unit during installation.
-> Replace damaged parts during removal.
-> Always position the airbag unit in such a way that the airbag opening is facing upwards.
-> If removed for an extended period, the airbag unit must be stored in a safe place.
-> Airbag units must not come into contact with grease, oil, detergents, liquids, or similar substances.
-> Do not expose airbag units to temperatures above 90°.
-> Do not remove the short-circuit spring on the plug-in contacts.
-> Ignition and preparations may only be carried out by skilled staff, supervised by a second responsible person.
-> Before disposal, the airbag unit must be rendered harmless by electrical ignition performed in accordance with all precautionary measures, thereby preventing it from being used incorrectly.
Information
With the PDK steering wheel version, the unlocking tool -1- (Torx with handle or screwdriver) must also be guided by hand while unlocking it.
Retaining bar for airbag
If the unlocking tool -1- is not "guided", the locking spring -2- can tilt sideways in the steering wheel.
If the locking spring -2- is tilted, it will not be possible to release the retaining bar.
If the retaining bar cannot be released, the driver's airbag unit must be pressed into the steering wheel again several times using jerking movements and then released again.
Airbag unit
1. Turn steering wheel 90° and stick a T30 (Torx with handle) or medium-size screwdriver through the opening on the steering wheel -arrow-.
Releasing driver's airbag unit
2. Pull the airbag unit out of the steering wheel -arrow-.
Airbag unit
Removing airbag lead:
3. Unlock electric connectors -1, 2- with a screwdriver -a- and pull them off -arrow-.
Unplugging airbag leads
4. Unplug electric connector -3-.
Installing driver's airbag unit
Information
If a new component (e.g. sensor, airbag control unit, airbag unit) of the airbag system has to be installed, the new component will be supplied with a barcode sticker (tear-off label).
Sample tear-off label shown >> airbag sensor
- Tear off the tear-off label -2- on the new component -1- and stick it under the heading Proof of airbag system check/component replacement in the Guarantee and Maintenance booklet.
Tear-off label
- The replacement date and mileage must be documented and the booklet must be stamped with the dealer's stamp.
WARNING
Incorrect handling of airbag units
- Triggering of airbag unit
- System faults can occur
-> Switch off ignition and remove ignition key.
-> A voltage supply (e.g. battery charger) must not be connected to the external power supply/jump-lead starting terminals.
-> Disconnect the battery and insulate the ground strap so that all contact with a ground carrier is avoided.
-> Wait 1 minute after disconnecting the battery.
-> Only pull off connector on the triggering unit after the waiting time has elapsed.
-> Make sure that no foreign objects are located in front of the airbag unit during installation.
-> Replace damaged parts during removal.
-> Always position the airbag unit in such a way that the airbag opening is facing upwards.
-> If removed for an extended period, the airbag unit must be stored in a safe place.
-> Airbag units must not come into contact with grease, oil, detergents, liquids, or similar substances.
-> Do not expose airbag units to temperatures above 90°.
-> Do not remove the short-circuit spring on the plug-in contacts.
-> Ignition and preparations may only be carried out by skilled staff, supervised by a second responsible person.
-> Before disposal, the airbag unit must be rendered harmless by electrical ignition performed in accordance with all precautionary measures, thereby preventing it from being used incorrectly.
Information
Before installing the airbag unit, check to see whether the locking clip, the airbag unit mounting and/or the metal stop on the steering wheel are bent. Replace the damaged component if it is deformed. Only fit an airbag unit that has a perfectly functioning locking clip at the correct position. The locking clip must not jam or become hooked.
Installing airbag unit:
1. Plug in electric connector -3- until it is plugged in completely.
Inserting airbag leads
2. Plug in electric connectors -1, 2- until they engage securely, then lock the retainer for the electric connectors -1, 2-.
Incorrect triggering of airbag module. => Removing and installing driver's airbag unit - General warnings
3. Insert the airbag unit into the steering wheel -arrow-.
Installing airbag unit
4. Insert the airbag unit into the steering wheel with both hands using intermittent pressure -arrow-.
Engaging airbag unit
5. Each time the airbag unit is fitted, it is important to check that it is installed correctly by pulling the airbag unit -arrow- , tapping the steering wheel rim and performing a visual inspection (position of airbag unit on steering wheel).
Checking airbag unit is positioned firmly
Subsequent work
Subsequent work for removing and installing driver's airbag unit
1. Connect the battery. Carry out => Work instructions after disconnecting the battery.