sensor AUDI A4 1998 B5 / 1.G Airbag Service Workshop Manual

69-43

All models

Always replace any deployed airbag unit and
the following
Also replace the following if passenger-side
airbag deployed:

Flap and mounting frame for airbag (do not
reshape deformed mounting frames) and
instrument panel (if damaged).
Lateral acceleration sensor (if floor pan in area
near sensor is deformed).
Also replace the following if driver-side airbag
deployed:
Spiral spring with slip ring.
Lateral acceleration sensor (if floor pan in area
near sensor is deformed).
Also replace the following if side airbag
deployed:
Lateral acceleration sensor for the deployed
side airbag.

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Seatback cushion.
Backrest cover.
Lateral acceleration sensor that hasn't been
activated (if area near it in floor pan has been
deformed).
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69-44
Also replace the following if side curtain airbag
deployed:

Acceleration sensor for deployed side airbag.
Molded headliner.
Trim panels at A-pillar, B-pillar, C-pillar and D-
pillar.
Acceleration sensor that hasn't been activated
(if floor pan in area near sensor is deformed).
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69-47

Airbag system side airbags, safety
precautions


WARNING!

Checking, removing, installing and servicing
may ONLY be performed by qualified
personnel.
Following the same safety precautions as for
driver and passenger-side airbags.
Only use original equipment seat covers and
backrest covers that are approved for use
with side airbags (identified by a label on the
fabric).
Do not use extra seat covers over the seat as
they interfere with proper side airbag
operation.
Do not use seat cushion supports, mats or
similar since they impare seat occupant
sensor and airbags

Note:
The driver's seat does not have a seat occupant
sensor.
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Side airbag units have an expiration date
(see sticker on B-pillar). If side airbag units
are replaced, pull sticker with expiration date
off new side airbag unit and place it over old
sticker on B-pillar. Replace side airbag unit
and sticker after 14 years.
If there is no sticker on the B-pillar, airbag
change must be indicated in service plan.
If side airbag unit is replaced, pull airbag
number sticker off side airbag unit and stick
it to the seat pan.
Do not use a needle or other sharp objects to
poke around area near airbag and sensor
mat.
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69-51


Airbag component locations, overview

Repair Manual, Body On Board Diagnostic
(OBD), Repair Group 01
1 -
Driver-side airbag unit
Removing m.y. 1998 page 69
-53
Removing m.y. 1998 page 69
-54
2 -
Driver-side airbag unit (sport steering
wheel)
Removing m.y. 1998 page 69
-58
Removing m.y. 1998 page 69
-61
3 -
Airbag control module -J234-
Removing and installing page 69
-74
4 -
Passenger-side airbag unit
Removing page 69
-70
Locking and activating (adaptation)
5 -
Seat occupant sensor
Removing and installing page 69
-83
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69-52


6 -
Side airbag
Removing and installing page 69
-75
7 -
Crash sensor for side airbag
Removing and installing page 69
-85
8 -
Spiral spring
Removing and installing m.y. 1998
page 69
-64

Removing and installing from sport steering
wheel m.y. 1998 page 69
-67

Removing and installing m.y. 1998
page 69
-68

9 -
Data Link Connector (DLC)
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69-76


- Disconnect intermediate connector for seatback
heater -6-.
- Disconnect harness connector for side airbag -1-
from outer edge of seat Fig. 1

- Remove side airbag unit page 69
-79
.
1 -
Harness connector for side airbag
2 -
Harness connector for sensor mat
3 -
Retaining tab
4 -
Harness connector for seat heater
5 -
Connector strip
6 -
Intermediate connector for seatback
heater
7 -
Airbag number sticker
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69-83

Seat occupant sensor, removing and
installing


WARNING!

Before starting work on seats, connect VAS
5094 airbag adapter page 72
-9 .

Note:
The seat occupant sensor will be used at a later
time.

Note:
Sensor mat is only available as a replacement part which includes seat
heater and seat cushion. - Removing seat page 72
-2 .
- Remove seat cover page 74
-15
.
- Press retaining tabs -3- and disconnect connector -1- for seat occupant
sensor from connector strip -4-.
- Disconnect Ground (GND) strap from harness connector -1- (location -
4-).
- Unclip harness connector -5- and disconnect intermediate connector to
backrest.
- Remove seat cushion along with sensor mat and seat heater from seat
pan.
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69-84

- When installing, make sure bar -2- points toward
tunnel.

- After installing sensor mat, test sensor mat
function using VAG1551 Scan Tool (ST) page
69
-84
.

Testing sensor mat function

Note:
Illustration is shown without cover.

- Remove any seat mats before testing sensor
mats.

- Connect
VAG1551
scan tool
Repair Manual, Body
On Board Diagnostic (OBD), Repair Group 01
.

-
Select
Read
Measuring
Value
Block
(function
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