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Trim, noise insulation > < Exploded view of seat occupied recognition system

A4 Mk3

Removing and installing seat occupied sensor
Removing and installing seat occupied sensor
  WARNING
t  Observe safety regulations for working on pyrotechnic components → Chapter and seat occupied sensors → Chapter.
t  Before handling pyrotechnic components (e.g. unplugging the electrical connector) the mechanic must discharge static electricity 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:
t  Seat occupied recognition control unit -J706-
t  Pressure sensor for seat occupied recognition -G452-
t  Seat occupied sensor mat
t  Seat padding
t  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.
–  Attach front seat to seat repair stand -VAS 6136- → Chapter.
–  Remove front seat backrest → Chapter.
   
  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-.
  A72-10842
–  Release retaining spring -1- and swivel seat occupied recognition control unit -J706--item 2- out of retainer.
–  Press catch and pull electrical connector -4- out of retainer.
–  Open retaining tab at guide -5- for electrical wiring harness -arrow- and move electrical wiring harness -3- clear.
  A72-10853
–  Remove bolt -3-.
–  Detach front passenger side seat position sensor -G554--item 2- and at the same time guide guide lug -arrow- out of lower seat pan frame -1-.
–  Remove seat cover and padding of seat pan (seat pan without seat depth adjustment) → Chapter and carefully fold to side.
  A69-10407
–  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.
Installing
  Caution
Do not unplug electrical connectors at pressure sensor for seat occupied recognition -G452- and seat occupied recognition control unit -J706-.
–  Clean threaded holes for self-locking bolts, using e.g. a thread tap.
–  Renew all self-locking bolts.
Installation is carried out in the reverse order; note the following:
  WARNING
t  Observe safety regulations for working on pyrotechnic components → Chapter and seat occupied sensors → Chapter.
t  Before handling pyrotechnic components (e.g. plugging in the electrical connector) the mechanic must discharge static electricity by briefly touching the door striker plate, or similar.
t  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.
–  With ignition switched on, connect battery earth wire → Electrical system; Rep. gr.27.
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.
t  Basic setting for seat occupied recognition control unit -J706-
Tightening torque → Chapter
  A72-10843

Trim, noise insulation > < Exploded view of seat occupied recognition system