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Roll-over protection system > < Servicing seat occupied recognition system for front passenger airbag (country-specific version)

A4 Cabriolet Mk2

Removing and installing seat occupied sensor
Removing and installing seat occupied sensor
  WARNING
Observe the safety precautions for working on airbags → Chapter, side airbags → Chapter and seat-occupied sensor → Chapter and → Chapter.
   
  WARNING
The replacement part (service kit) for seat occupied recognition (USA) 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 for seat occupied recognition -G452-.
  Note
t  The seat occupied recognition system is only fitted on the front passenger's seat.
t  Modular wire routing has been used for the USA version from 06.06 onwards.
Perform the following operations before removing seat occupied recognition control unit -J706- → Item or service kit → Anchor:
–  Check type of front seats, vehicle model and whether or not modular wire routing has been employed, and perform repair work accordingly.
–  Check which of the two possible modular wire routing versions has been used, »Modular Light« or »Modular« → Chapter.
Refer to the following sections for further information on modular wire routing:
t  Exploded view of modular wire routing → Chapter
t  Modular wire routing versions → Chapter
t  Modular wire routing with corrugated tube at front seat → Chapter
1 - Seat occupied recognition control unit -J706-
Removing
  WARNING
Observe the safety precautions for working on airbags → Chapter, side airbags → Chapter and seat-occupied sensor → Chapter and → Chapter.
–  Disconnect battery earth strap → Electrical system; Rep. gr.27.
–  Remove front passenger seat → Chapter.
–  Attach seat repair stand -VAS 6136- to engine and gearbox support -VAS 6095-.
–  Attach front seat to seat repair stand -VAS 6136-.
–  Remove backrest → Chapter, for seat with electrical adjustment → Chapter.
–  Unplug connector -6-.
–  Remove bolts -2- (2x).
–  Detach seat cover → Chapter, → Chapter.
–  Unfasten guide clip -8-.
  Caution
Do NOT unplug connectors -3- and -7-.
–  Push pressure sensor for seat occupied recognition -G452--4- to side off retaining bracket -9-.
2 - Bolts
t  2.5 Nm
3 - Connector at seat occupied recognition control unit -J706-
t  Do NOT unplug under any circumstances.
4 - Pressure sensor for seat occupied recognition -G452-
5 - Pressure hose
6 - Connector between service kit and seat wiring harness
q   Not fitted with »Modular« wire routing → Chapter
7 - Connector at pressure sensor for seat occupied recognition -G452-
t  Do NOT unplug under any circumstances.
8 - Guide clip
9 - Retaining bracket

Removing service kit
l  Seat removed
Vehicles with modular wire routing
–  Unfasten corrugated tube → Chapter.
–  Take wire leading to service kit out of corrugated tube → Chapter.
All vehicles (continued)
   
–  Fold up padding -5-.
  Note
t  The padding is part of the service kit.
t  Clip -4- must not be disengaged.
t  The solid foam insert in the fleece is not part of the scope of delivery of the service kit.
–  Remove clips -2- and -3- (2x).
–  Carefully pull up seat occupied sensor mat -1- with padding -5-. In doing so, guide pressure sensor for seat occupied recognition -G452- and seat occupied recognition control unit -J706- through seat pan without unplugging connectors.
–  Detach complete service kit.
  WARNING
It is important that you do not bend or kink the pressure hose or the seat occupied sensor mat -1- while you are working.
Installing service kit
  WARNING
Observe the safety precautions for working on airbags → Chapter, side airbags → Chapter and seat-occupied sensor → Chapter and → Chapter.
  Note
The solid foam insert in the fleece is not part of the scope of delivery of the service kit. The solid foam insert in the seat fleece is therefore to be re-used.
–  Working from above, guide pressure sensor for seat occupied recognition -G452- and seat occupied recognition control unit -J706- through seat pan without unplugging connectors.
  A69-10084
–  Smooth down fleece between seat pan and seat-occupied sensor mat -1- (no creases).
–  Secure seat occupied sensor mat -1- using clips -2- and -3- (2x).
Vehicles with modular wire routing
–  Route wire leading to service kit in corrugated tube → Chapter.
–  Fasten corrugated tube → Chapter.
  A69-10084
All vehicles (continued)
1 - Seat occupied recognition control unit -J706-
Installing
–  Attach pressure sensor for seat occupied recognition -G452--4-.
–  Secure seat occupied recognition control unit -J706- with bolts -2- (2x, 2.5 Nm).
–  Plug in connector -6-.
–  Install padding for seat pan, making sure that all upholstery clips are engaged/installed in previous positions (before removal) → Chapter or → Chapter (for seats with electric seat adjustment).
Remaining installation is performed in reverse order of removal. Observe the following:
–  After fitting front passenger's seat in vehicle, carry out the following program under „Airbag“ in the Guided Fault Finding.
After installing a new service kit and after carrying out any repairs on the front passenger seat:
t  Basic setting for seat occupied recognition control unit -J706-
After fitting seat
–  Switch on ignition with battery disconnected.
  WARNING
Make sure nobody is in the vehicle when the battery is being connected.
–  Connect battery → Rep. gr.27.
  Note
If the airbag warning lamp -K75- indicates a fault following installation, use the vehicle diagnostic, testing and information system -VAS 5051 A- to interrogate, erase and then re-interrogate the event memory.
2 - Bolts
t  2.5 Nm
3 - Connector at seat occupied recognition control unit -J706-
t  Do NOT unplug under any circumstances.
4 - Pressure sensor for seat occupied recognition -G452-
5 - Pressure hose
  WARNING
It is important that you do not bend or kink the pressure hose -5- or the seat occupied sensor mat during installation.
–  Secure pressure hose to guide clip -8- at marking provided.
6 - Connector between service kit and seat wiring harness
q   Not fitted with »Modular« wire routing → Chapter
7 - Connector at pressure sensor for seat occupied recognition -G452-
t  Do NOT unplug under any circumstances.
8 - Guide clip
9 - Retaining bracket

   

Roll-over protection system > < Servicing seat occupied recognition system for front passenger airbag (country-specific version)