Seat Occupant Sensor: Service and Repair
Passive Occupant Detection System
CAUTION!
Observe the safety precautions for repairs on airbags. Refer to => [ Airbag System General Safety Precautions ] Airbag Safety Precautions, side airbags => [ Side Airbag Safety Precautions ] Airbag Safety Precautions and the seat occupied recognition system, refer to => [ Passenger Occupant Detection Sensor Safety Precautions ] Airbag Safety Precautions and => [ Passenger Occupant Detection System, Measures Required after an Accident ] Airbag Safety Precautions.
CAUTION!
Replacement part (service kit) for seat occupied sensor (USA) is already pre-calibrated and must not be disconnected under any circumstance. The service kit consists of:
• Seat Occupied Recognition Control Module (J706)
• Seat Occupied Recognition Pressure Sensor (G452)
• Passive Occupant Detection System Mat
• Seat cushion
• Wiring harness between Seat Occupied Recognition Control Module (J706) and Seat Occupied Recognition Pressure Sensor (G452).
• The passive occupant detection system is only installed on the front passenger seat.
• For USA vehicles, modular wiring routing has been implemented from 06.2006.
Perform the following steps before removing the Seat Occupied Recognition Control Module (J706).
- Check the vehicle seat design and if there is modular wiring routing; then perform the appropriate repairs.
- Check which one of the two possible modulate wiring routing is installed, Modular Light or Modular. Refer to => [ Modular Wiring Routing Versions ] Front Seats
Additional information regarding modular wiring routing can be found in the following chapters:
• Modular wiring routing, assembly overview, refer to => [ Modular Wiring Routing Assembly Overview, from June 2006 ] Front Seats
• Modular wiring routing, versions, refer to => [ Modular Wiring Routing Versions ] Front Seats
• Modular wiring routing with corrugated tube on front seat, refer to => [ Modular Wiring Routing with Corrugated Tube on Front Seat ] Front Seats.
1 Seat Occupied Recognition Control Module (J706 )
Removing
CAUTION!
Observe the safety precautions for repairs on airbags. Refer to => [ Airbag System General Safety Precautions ] Airbag Safety Precautions, side airbags => [ Side Airbag Safety Precautions ] Airbag Safety Precautions and the seat occupied recognition system => [ Passenger Occupant Detection Sensor Safety Precautions ] Airbag Safety Precautions and => [ Passenger Occupant Detection System, Measures Required after an Accident ] Airbag Safety Precautions.
- Disconnect the battery ground (GND) strap.
- Remove the passenger seat.
- Mount the Fixture For Seat Repair (VAS 6136) on the Engine And Transmission Holder (VAS 6095).
- Attach the front seat to the Fixture For Seat Repair (VAS 6136).
- Remove the backrest from the. Refer to => [ Front Backrest ] Front Seats power seat => [ Front Backrest ] Power Front Memory Seats.
- Disconnect connector - 6 -.
- Remove bolts - 2 - (Qty. 2).
- Remove cushion from cover. Refer to => [ Seat Pan Cover and Cushion, Standard Seat ] Front Seat Covers and Cushion, => [ Seat Pan Cover and Cushion, Standard Seat ] Front Seat Covers and Cushion, Power Memory Seats.
- Open the guide clip - 8 -.
CAUTION!
Connectors - 3 - and - 7 - must not be separated.
- Slide Seat Occupied Recognition Pressure Sensor ( G452) - 4 - sideways from retaining clip - 9 -.
2 Bolts
• 2.5 Nm
3 Connector on Seat Occupied Recognition Control Module (J706)
• Must not be separated under any circumstances.
4 Seat Occupied Recognition Pressure Sensor (G452 )
5 Pressure Hose
6 Connector Between Service Kit and Seat Wiring Harness
• deleted on the wiring routing modular => [ Modular Wiring Routing Versions ] Front Seats
7 Connector on Seat Occupied Recognition Pressure Sensor (G452)
• Must not be separated under any circumstances.
8 Guide Clip
9 Retaining Bracket
Service Kit, Removing
• Seat removed
With Modular Wiring Routing
- Open the corrugated tube. Refer to => [ Modular Wiring Routing with Corrugated Tube on Front Seat ] Front Seats.
- Remove the Service Kit wire from the corrugated tube. Refer to => [ Modular Wiring Routing with Corrugated Tube on Front Seat ] Front Seats.
Procedure for all vehicles
- Fold the cushion - 5 - upward.
• The cushion is included as part of the service kit.
• Clip - 4 - must not be separated.
• The hard foam insert in the crease is not included in the service kit.
- Remove clips - 2 - and - 3 - (Qty. 2).
- Carefully pull seat occupied recognition mat - 1 - with cushion - 5 - upward while guiding Seat Occupied Recognition Pressure Sensor (G452) and Seat Occupied Recognition Control Module (J706) through seat pan without disconnecting connectors.
- Remove the complete service kit.
CAUTION!
The pressure hose and the Seat Occupied Recognition Mat - 1 - must not be kinked under any circumstances during repairs.
Service Kit, Installing
CAUTION!
Observe the safety precautions for repairs on airbags. Refer to => [ Airbag System General Safety Precautions ] Airbag Safety Precautions, side airbags => [ Side Airbag Safety Precautions ] Airbag Safety Precautions and the seat occupied recognition system => [ Passenger Occupant Detection Sensor Safety Precautions ] Airbag Safety Precautions and => [ Passenger Occupant Detection System, Measures Required after an Accident ] Airbag Safety Precautions.
• The hard foam insert in the crease is not included in the service kit. Therefore, reuse the hard foam insert again in the seat crease.
- Guide Seat Occupied Recognition Pressure Sensor ( G452) and Seat Occupied Recognition Control Module (J706) from above through seat pan without disconnecting connectors.
- Pull the crease between seat pan and Seat Occupied Recognition Mat - 1 - so that it is smooth (free of folds).
- Secure the Seat Occupied Recognition Mat - 1 - with the clips - 2 - and - 3 - (Qty. 2).
With Modular Wiring Routing
- Route the Service Kit wire in the corrugated tube. Refer to => [ Modular Wiring Routing with Corrugated Tube on Front Seat ] Front Seats.
- Seal the corrugated tube. Refer to => [ Modular Wiring Routing with Corrugated Tube on Front Seat ] Front Seats.
Procedure for all vehicles
1 Seat Occupied Recognition Control Module (J706 )
Installing
- Secure Seat Occupied Recognition Pressure Sensor (G452) - 4 -.
- Secure Seat Occupied Recognition Control Module ( J706) with bolts - 2 - (Qty. 2) to 2.5 Nm.
- Connect connector - 6 -.
- Upholster the seat pan, thereby all cushion clips must be attached and be installed at the original position. Refer to => [ Seat Pan Cover and Cushion, Standard Seat ] Front Seat Covers and Cushion, for electric seat => [ Seat Pan Cover and Cushion, Standard Seat ] Front Seat Covers and Cushion, Power Memory Seats.
Further installation is performed in the reverse order of removal. Observe the following when doing so:
- After installing the passenger seat in the vehicle, the following program must be performed under "Airbag" in Guided Fault Finding.
When installing a new service kit and after every repair on the front passenger seat:
• Seat Occupied Recognition Control Module (J706), basic setting
After the seat was installed
- Switch on the ignition with the battery disconnected.
CAUTION!
No one should be in vehicle when connecting battery.
- Connect the battery.
• If the Airbag Malfunction Indicator Lamp (MIL) ( K75) shows a malfunction after assembly, DTC memory must be checked with Vehicle Diagnostic, Testing and Information System ( VAS 5051 A), cleared and then rechecked.
2 Bolts
• 2.5 Nm
3 Seat Occupied Recognition Control Module (J706 ) Connector
• Must not be separated under any circumstances.
4 Seat Occupied Recognition Pressure Sensor (G452 )
5 Pressure Hose
CAUTION!
The pressure hose - 5 - and the Seat Occupied Recognition Mat must not be kinked under any circumstances during repairs.
- Secure pressure hose at guide clip - 8 - at specified marking.
6 Connector Between Service Kit and Seat Wiring Harness
• deleted on the wiring routing modular => [ Modular Wiring Routing Versions ] Front Seats
7 Seat Occupied Recognition Pressure Sensor (G452 ) Connector
• Must not be separated under any circumstances.
8 Guide Clip
9 Retaining Bracket