Part 3

Seat position sensor (USA/CAN only)




The seat position sensor can be used to classify whether a small or large person sitting in the seat. There are two seat position sensors in the vehicle - one under the driver's seat and one under the front passenger seat. The seat position sensors are directly connected to the supplemental restraint system module (SRS).
The seat position sensors comprise a Hall sensor that changes current strength based on the position of the seat. The seat position sensor has two classifications - small person or large person. Small person indicates that the seat is approx. 10 cm (4 in) or less from the front-most seat position. All other positions are classified as large person.
For collision purposes, this information is used to optimize the function of adaptive belt force limitation and the front passenger airbag.

SRS indication




The supplemental restraint system module (SRS) continuously checks the system. A diagnostic trouble code (DTC) is stored and an SRS indication is made.
SRS indication is accompanied by a text message in the Driver information module (DIM), partly through:
- an SRS warning lamp
- a general warning lamp
The lamps light depending on how serious the fault is: Information about which lamp should be lit is transmitted by the supplemental restraint system module (SRS) on the controller area network (CAN).
The SRS warning lamp lights when the ignition is switched on. If no faults are registered by the control module, either internally or from the sensors, wiring or igniters, a signal is transmitted on the controller area network (CAN) to the driver information module (DIM) confirming that the SRS warning lamp can be switched off. If no faults are detected when the ignition is switched on, the lamp will remain lit for a few seconds. The lamp goes out when the system has been checked and is operating without faults.
The control module has an EEPROM memory which retains data about diagnostic trouble codes (DTCs) even when the battery has been disconnected.
The driver information module (DIM) continuously indicates to the supplemental restraint system module (SRS) the function of the SRS warning lamp. If the lamp stops working, the general warning lamp lights up and a message is displayed.

Note! If a diagnostic trouble code is stored because the resistance in an SRS ignition cable is too high or too low, it is important that the resistance of the SRS ignition cable is not measured when the collision protection system is connected. Special tools with the same resistance as the collision protection system must be used for troubleshooting.

Front passenger airbag indication (2007)




In order to indicate the status of the front passenger airbag, the vehicle is equipped with a passenger airbag warning lamp (PAD). The warning lamp is located in the roof console and is directly connected to the supplemental restraint system module (SRS).
The supplemental restraint system module (SRS) turns the warning lamp on or off depending on whether the front passenger airbag is disabled.
If there is a front passenger airbag switch installed (market dependent) and it is used to disable the airbag, the front passenger airbag warning lamp (PAD) lights.
The warning lamp goes out when the airbag is enabled.
If an occupant weight sensor (OWS) is installed (market-dependent), the warning light airbag passenger (PAD) is lit when the airbag is deactivated.
The warning lamp goes out when the airbag is enabled.
Reason the passenger airbag warning lamp (PAD) lights could also be:
- malfunction of the switch for the front passenger airbag, causing the supplemental restraint system module (SRS) to disable the front passenger airbag.
- malfunction of the occupant weight sensor (OWS), causing the supplemental restraint system module (SRS) to disable the front passenger airbag.
- other problems that affect function of the SRS-system.

Front passenger airbag indication (2008-)




To indicate status of airbag passenger, the vehicle is equipped with two warning lights. The lights are located in the roof panel and are directly connected to the Supplemental restraint system module (SRS)
The supplemental restraint system module (SRS) turns the warning lights on or off depending on whether the front passenger airbag is deactivated or not.
If there is a front passenger airbag switch installed (market-dependent) and it is used to deactivate the airbag, the front passenger airbag warning light (PAD) (1) is lit.
The warning light turns off when the airbag is activated again and then warning light activated airbag passenger (PAE) (2008-) (2) is lit instead (not USA/CAN).
If an occupant weight sensor (OWS) is installed (market-dependent), the warning light airbag passenger (PAD) is lit when the airbag is deactivated.
The warning light turns off when the airbag is activated again. In these cases, the warning light activated airbag passenger (PAE) (2008-) (not USA/CAN) will never be lit.
Reason the passenger airbag warning lamp (PAD) lights could also be:
- malfunction of the switch for the front passenger airbag, causing the supplemental restraint system module (SRS) to disable the front passenger airbag.
- malfunction of the occupant weight sensor (OWS), causing the supplemental restraint system module (SRS) to disable the front passenger airbag.
- other problems that affect function of the SRS-system.

Deploying airbags/belt tensioners
The supplemental restraint system is extremely advanced. It is able to adapt airbag and belt tensioner deployment to suit the specific circumstances of a collision. In general, it is extremely unlikely that all airbags and belt tensioners will be deployed in the same accident. It is possible that only one airbag or belt tensioner is deployed. This is determined by the supplemental restraint system module (SRS) based on the forces that arise during the collision.
If the control module deploys the front airbags, all stages will always be activated. By varying the time between the deployment phases, the inflation of the airbag is more gentle for a low speed collision.

Deployment levels for impact protection upon head-on collision
The table below shows how the SRS system usually reacts in the event of a head-on collision.
Level 1= Low speed collision
Level 5 = Severe collision






Deploying the side impact protection system
The table below shows how the SRS system usually reacts in the event of a side-on collision.






Deployment levels for impact protection upon rear-end collision
The table below shows how the SRS system usually reacts in the event of a rear-end collision.