ECU AUDI A4 1999 B5 / 1.G Airbag Service Workshop Manual

69-49

Additional safety precautions for side
curtain protection airbag


WARNING!

All safety precautions for the driver and
passenger-side airbags apply, as well as the
following:

Visually check the vehicle's trim panels for
damage before every installation.
Do not attempt any repair work on the
vehicle trim panels (top trim panels for A-
pillar, B-pillar, C-pillar and D-pillar).
Make sure the trim panel is securely fitted
during installation.
Side curtain airbags must only be folded at
its intended location (transition of roof to A-
pillar).
To carry out repairs behind the side curtain
airbag, always remove the entire unit first.
After removal, always carry the side curtain
airbag in the folded position.
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69-50

WARNING!

After removal, place the side curtain airbag
into the transport container in the folded
position or lay on a clean, even surface (on a
blanket or in the luggage compartment).
After servicing the body of vehicle in vicinity
of airbag, check the body for welding beads,
deformations and chafe marks (compare to
opposite side of the vehicle).
Always hold the side curtain airbag
securely.
After removal, always fold the side curtain
airbag and grasp by the igniter (thumbs
toward E-connection).
Always keep one hand on the igniter.
Never twist, wind, bend, throw, spin, pull,
hang, squeeze, press, pinch or clamp the
side curtain airbag.
If any contamination penetrates into the
fabric (i.e. oil, grease, lacquer, paint or
solvent), the unit must always be replaced.
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69-54


Driver-side airbag unit (m.y. 1998 ),
removing and installing

WARNING!
Follow all safety precautions when working on
the airbag page 69
-40
.
1 -
Steering wheel
Removing page 69
-57
- Secure loose cable at location indicated
by arrow -A-.
2 -
Harness connector for spiral spring
3 -
Harness connector for airbag unit
4 -
Multipoint socket
Always replace60 Nm (44 ft lb)
5 -
Airbag unit
6 -
Threaded bushing
7 -
Torx bolt (T30)
8 -
Torx wrench (T30)
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69-58


Driver-side airbag for sport steering wheel
( m.y. 1998), removing and installing

WARNING!
Follow all safety precautions when working on
airbags page 69
-40
.
1 -
Bolts to secure upper part of carrier unit
5 Nm (44 in. lb)
2 -
Harness connector for airbag unit
3 -
Airbag unit
4 -
Nut for steering wheel 42 Nm (31 ft lb)
5 -
Bolts to secure lower part of carrier unit. 5 Nm (44 in. lb).
6 -
Torx bolt (T30) 6 Nm (53 in. lb)
7 -
Securing cable for spiral spring
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69-67


Sport steering wheel spiral spring ( m.y.
1998), removing and installing

Notes:
Wheels must be facing straight ahead.
Before removing spiral spring, remove airbag
unit and steering wheel.
- Remove bolts -1- (3x).
- Tightening torque: 5 Nm (44 in. lb)
- Remove carrier unit. Disconnect harness
connectors.
- Remove bolts -5- (3x).
- Tightening torque: 5 Nm (44 in. lb)
- Remove lower part of carrier unit. Disconnect
harness connectors.
- Remove bolts securing spiral spring.
- Pull spiral spring downward and remove. Do not
rotate spiral spring while it is removed.
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69-69


- Remove bolts -2- (2x).
Tightening torque: 0.6 Nm (5 in. lb)
- Remove hex bolt -1-.
Tightening torque: 0.6 Nm (5 in. lb)
- Remove lower trim for steering wheel switch -3-.

Notes: - Disconnect harness connector -1-.
- Release retaining tab (arrows) and pull spiral spring from steering
wheel switch.
Wheels must be in straight-ahead position when removing or installing
spiral spring. A new spiral spring is secured in the centered position using a tie
wrap.
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69-74

Airbag control module -J234-, removing
and installing


- Disconnect battery Ground (GND) strap.

- Remove front center console page 68
-30
.

Note:
If the airbag control module is replaced, the new control module must be
coded. - Disconnect securing bracket at harness connector -3-.
- Disconnect harness connector -3- from control module -1-.
- Remove nuts -2- (3x).
Tightening torque: 6 Nm (53 in. lb)
- Remove airbag control module -J234-.
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69-88


Side curtain protection airbag (sedan),
removing and installing

WARNING!
Follow all safety precautions when working on
airbags page 69
-40
and side curtain airbag
page 69
-49
.
1 -
Side curtain airbag
Removing:
- Remove upper A-pillar trim panel
page 70
-88
.
- Remove upper B-pillar trim without
loosening seat belt page 70
-91
.
- Remove upper D-pillar trim page 70
-
96
.
- Remove bolts - 4 - (2x).
- Unclip side curtain airbag at clip - 3 -.
- Fold front portion of side curtain airbag
toward rear and secure at Velcro strip
(inset). - Disconnect harness connector for side
curtain airbag Fig. 2
.
- Remove bolts - 8 - (2x).
- Remove igniter - 5 - at clip - 7 -.
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69-89


WARNING!
Always follow installation sequence for side
curtain airbag.
WARNING!
Make sure the passenger compartment is not - Remove side curtain airbag - 1 - by grab
handle adapters - 2 -.
Installing:
- Secure side curtain airbag at grab handle
adapters - 2 - (2x) using pre-assembly
clips Fig. 5

- Clip igniter - 5 - in at clip - 7 -.
- Install bolts - 8 - (2x) Fig. 1
.
- Release front portion of airbag - 1 - and
fold it back to A-pillar, during this, twist-
securing seam -A- must face center of
vehicle.
- Clip in side curtain airbag using clip - 3 -.
- Install bolt - 4 - Fig. 3
.
- Remainder of installation is in reverse
order of removal
- Switch ignition on.
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69-93


The procedure is the same at the front and the rear.
Notes:
Repair Manual, Body On Board Diagnostic (OBD), Repair Group 01
Fig. 5 Mounting side curtain airbag at roof grab handle
- Insert pre-assembly clip -A- into mounting point -C-.
- Insert pins -B- in mounting points -D-.
- Twist-securing seam -E- must face center of vehicle.
1 - Side curtain airbag
2 - Grip handle adapter, delivery casing airbag
After reconnecting the battery, check and activate the vehicle's
electrical equipment (radio, clock, window regulators) according to the
repair manual and/or Owner's Manual. If the airbag Malfunction Indicator Lamp (MIL) -K75- indicates a
malfunction, the DTC memory must be erased and then checked
again using the VAG1551 scan tool.
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