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Removing and installing seat occupied sensor
Special tools and workshop equipment required
Removal lever -80 - 200-
WARNING
Observe safety regulations for working on pyrotechnic components
Chapter and seat occupied sensors Chapter.
Before handling pyrotechnic components (e.g. unplugging the
electrical connector) the mechanic must discharge any static
electricity. This can be done by briefly touching the door striker
plate, or similar.
WARNING
The replacement part (service kit) for seat occupied recognition
(country-specific version) is already pre-calibrated and the
components must NOT be disconnected. The service kit consists
of:
Seat occupied recognition control unit -J706-
Pressure sensor for seat occupied recognition -G452-
Seat occupied sensor mat
Seat padding
Wiring harness between seat occupied recognition control unit
-J706- and pressure sensor -G452-.
Removing
Before taking out seat, move seat height adjuster to centre
position.
Remove front passenger's seat Chapter.
With ignition switched on, disconnect battery earth wire
Electrical system; Rep. gr.27; Battery; Disconnecting and
connecting battery.
Attach front seat to seat repair stand -VAS 6136- Chapter.
Remove front seat backrest Chapter.
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Caution
Do not unplug electrical connectors at pressure sensor for seat
occupied recognition -G452- and seat occupied recognition control
unit -J706-.
Using a small screwdriver, carefully press pressure sensor for
seat occupied recognition -G452--item 3- off retainer -arrow-.
Move clear guide -1- for pressure hose for seat occupied
recognition and pressure hose -2-.
Unscrew bolt -2- and swivel seat occupied recognition control
unit -J706--item 1- out of retainer.
Press catch and pull electrical connector for belt buckle out of
retainer.
Move clear electrical wiring harness.
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Remove bolt -1-.
Unclip front passenger side seat position sensor -G554--item 2-
from lower seat pan frame and detach.
Remove seat cover and padding (seat pan without seat depth
adjustment) of seat pan Chapter and carefully fold to side.
Carefully lever off retaining clips -1- and -3- for seat
occupied sensor mat at front of seat pan using removal lever -80 -
200-.
Detach seat cover with padding for seat pan. To do so, first
guide pressure sensor for seat occupied recognition -G452- with
wiring harness out through opening in seat pan. Finally, guide seat
occupied recognition control unit -J706- out through opening.
WARNING
Risk of damage!
The pressure hose and the mat for the seat occupied sensor must
not be bent or kinked.
Detach seat cover with padding for seat pan together with seat
occupied sensor mat -2-, pressure sensor for seat occupied
recognition -G452- and seat occupied recognition control unit
-J706-.
Detach seat cover from padding for seat pan Chapter.
Caution
Do not separate seat pan padding from seat occupied sensor
mat.
Installing
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Caution
Do not unplug electrical connectors at pressure sensor for seat
occupied recognition -G452- and seat occupied recognition control
unit -J706-.
Install in reverse order of removal; note the following:
WARNING
Observe safety regulations for working on pyrotechnic components
Chapter and seat occupied sensors Chapter.
Before handling pyrotechnic components (e.g. plugging in the
electrical connector) the mechanic must discharge any static
electricity. This can be done by briefly touching the door striker
plate, or similar.
The pressure hose and the mat for the seat occupied sensor must
not be bent or kinked.
Note
Make sure electrical connectors are fitted correctly (as far as
stop) and engage audibly.
WARNING
The battery must be connected with the ignition switched on. If
pyrotechnic components (e.g. airbag or belt tensioner) are
inexpertly repaired, this may result in unwanted triggering after
connecting the battery. There must not be anyone in the vehicle
while you are connecting the battery.
DANGER!
When working on a vehicle with the ignition switched on or while
the drive system is active, the engine can start unexpectedly and
exhaust fumes can cause a health hazard in closed rooms. Moving
parts can trap or draw in parts of the body and/or clothing (safety
hazard).
Before switching on the ignition, perform the following
steps:
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Move selector lever to position P
Activate parking brake
Switch off ignition.
Open bonnet
Connect battery charger (e.g. -VAS 5095A-) to jump-start
connections of 12 V electrical system.
Switch on ignition.
With ignition switched on, connect battery earth wire Electrical
system; Rep. gr.27; Battery; Disconnecting and connecting
battery.
When installing a new service kit and following any repair work
on the front passenger's seat during which the seat cover and/or
backrest cover is/are disengaged, the basic setting for the seat
occupied recognition control unit must always be performed
Chapter.
Finally, select Airbag in Guided Fault Finding function using
Vehicle diagnostic tester.
Basic setting for seat occupied recognition control unit
-J706-
Tightening torque Chapter Overview of fitting locations - seat
occupied recognition system
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