XC90 AWD V8-4.4L VIN 85 B8444S (2005)
Seat Occupant Sensor: Testing and Inspection
Occupant weight sensor (OWS), checking
Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the
essential information in the illustrations is always correct.
System description of the Occupant weight sensor (OWS)
The occupant weight sensor (OWS) has a pressure sensor/ cushion filled with silicone located under the front seat cushion of the passenger seat.
Caution! Silicon can:
damage surrounding materials
interfere with the functions of electrical components
make the application of paint and adhesive difficult.
Any leakage from the occupant weight sensor (OWS) can be detected by a visual check of the passenger seat and surrounding area. Sticky transparent
stains in the area may indicate silicone leakage.
Leakage can also be detected when handling the passenger seat.
The SRS (supplemental restraint system) indicator lamp in the combined instrument panel is activated when approximately 30% of the silicone has
leaked out of the pressure sensor/ cushion. The capacity is approximately 500 g silicone.
Checking for leakage
Remove the front passenger seat. See: Front seat, replacing See: Body and Frame/Seats/Service and Repair/Removal and Replacement/Front Seat,
Driver's Seat, Front Seat/Front Seat, Replacing.
Take the front seat to a secluded location in the workshop, away from the body and paint shop.
Remove the pressure sensor/cushion. See: Occupant weight sensor (OWS), replacing See: Service and Repair/Removal and Replacement.
Check if the pressure sensor/cushion is sticky anywhere; If this is the case, silicone is leaking.
Caution! The leaking pressure sensor/cushion must be placed in a plastic bag and sealed with tape. The plastic bag must be disposed of
according to the workshop procedure for silicone waste.
Corrective action in event of leakage
Clean/decontaminate after silicone leakage. See: Occupant weight sensor (OWS), cleaning See: Service and Repair/Procedures.
Corrective action in the event of non-leaking pressure sensor, cushion
Install the pressure sensor/cushion. See: Occupant weight sensor (OWS), replacing See: Service and Repair/Removal and Replacement.