SRS AIR BAG SYSTEM
System Diagram
System Description
This SRS Air Bag System has the following functions.- 1.Detects a collision and supplies the energy for deploying air bag and seat belt pre-tensioner.
- 2.Detects electrical malfunction in SRS Air Bag System and Seat Belt Pre-tensioner System, records malfunction code, and blinking air bag warning lamp.
- 3.Detects and records the deployment of air bag and seat belt pre-tensioner, and turns ON air bag warning lamp.
- 4.Indicates malfunctioning portion with blinking times of air bag warning lamp in diagnosis mode.
- 5.Indicates the malfunction record by CONSULT-III.
- 6.Suppress the deployment of front passenger air bag when front passenger seat is empty or is occupied by a child or a child-seat.When passenger seat is occupied by a child or a child seat, turns ON front passenger air bag OFF indicator.
- 7.When judges that passenger seat is occupied by a adult or a child and passenger seat belt is not fasten, turns ON seat belt warning lamp.
COLLISION MODE- The operation of supplemental restraint system is different depending on the collision modes applications. For example, the driver air bag module, front passenger air bag module and front seat belt pre-tensioner are activated in a frontal collision but not in a side collision.
- SRS configurations that are activated for some collision modes are as per the following.
SRS configuration Frontal collision Left side collision Right side collision Driver air bag module. Refer to DTC Logic × — — Front passenger air bag module. Refer to DTC Logic × — — Front LH seat belt pre-tensioner. Refer to DTC Logic × — — Front RH seat belt pre-tensioner. Refer to DTC Logic × — — Front LH side air bag module. Refer to DTC Logic — × — Front RH side air bag module. Refer to DTC Logic — — × LH side curtain air bag module. Refer to DTC Logic — × — RH side curtain air bag module. Refer to DTC Logic — — × ×: Apply
—: Not apply
Component Parts Location
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1. |
Front passenger air bag module M103 |
2. |
Driver air bag module M301, M302 |
3. |
Combination switch (Spiral cable) M35 |
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4. |
LH/RH satellite sensor
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5. |
Front LH/RH seat belt pre-tensioner
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6. |
Seat belt buckle switch (Driver side/Passenger side)
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7. |
Air bag diagnosis sensor unit M147, B37, B 237 |
8. |
Front LH/RH side air bag module
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9. |
Crash zone sensor E36 |
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10. |
LH/RH side curtain air bag module
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11. |
Combination meter (air bag warning lamp) M53 |
12. |
Front passenger air bag OFF indicator M133 |
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13. |
Occupant Classification System control unit B253 |
14. |
Occupant Classification System seat sensor |
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A. |
View from vehicle side |
B. |
Passenger front seat |
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Component Description
|
Component |
Function |
|
Air bag diagnosis sensor unit |
Detects a collision and supplies power supply for deployment to air bag module and pre-tensioner seat belt. |
Air bag module
|
Receives signal from air bag diagnosis sensor unit and deploys air bag. |
|
Front seat belt pre-tensioner |
Receives signal from air bag diagnosis sensor unit and deploys pre-tensioner seat belt. |
|
Seat belt buckle switch |
Controls deployment timing depending on the seat belt condition that is fastened or unfastened. |
|
Crash zone sensor |
Transmits signal to air bag diagnosis sensor unit when a frontal collision occurs. |
|
Satellite sensor (LH/RH) |
Transmits signal to air bag diagnosis sensor unit when a side collision occurs. |
|
Occupant Classification System control unit |
Detects front passenger seat occupant and judges whether or not deploys front passenger seat air bag. |
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Combination meter (air bag warning lamp) |
Indicates air bag malfunctioning and deployment by blinking and illuminating air bag warning lamp. |
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Front passenger air bag OFF indicator |
Indicates whether or not front passenger air bag is in activation mode subject to the judgement by Occupant Classification System control unit. |
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Combination switch (spiral cable) |
Supplies power supply to driver air bag module on steering wheel. |