Driver Air Bag Module Description
The driver air bag module is dual stage and located in the steering wheel assembly. It operates with the SRS system in a frontal collision exceeding a specified level.
Scheme 1
Front Passenger Air Bag Module Description
The front passenger air bag module is located behind the instrument panel assembly. It operates with the SRS system in a frontal collision exceeding a specified level. Refer to [ OCCUPANT CLASSIFICATION SYSTEM (OCS) DESCRIPTION ] for more information.
Scheme 2
Front Side Air Bag Description
Front side air bag modules are built into the front seatback assemblies. Vehicles with side air bags are equipped with labels as shown.
Scheme 3
Side Curtain Air Bag Description
Side curtain air bag modules are located above the vehicle headlining. Vehicles with side curtain air bags are equipped with labels as shown.
Scheme 4
Front Seat Belt Pre-tensioner with Load Limiter Description
The seat belt pre-tensioner system with load limiter is installed for both the driver's seat and the front passenger's seat. It operates simultaneously with the SRS air bag system in the event of a frontal collision with an impact exceeding a specified level.
Scheme 5
When the frontal collision with an impact exceeding a specified level occurs, seat belt slack resulting from clothing or other factors is immediately taken up by the pre-tensioner. Vehicle passengers are securely restrained.
When passengers in a vehicle are thrown forward in a collision and the restraining force of the seat belt exceeds a specified level, the load limiter permits the specified extension of the seat belt by the twisting of the ELR shaft, and a relaxation of the chest-area seat belt web tension while maintaining force.
Direct-connect SRS Component Connectors Description
The following SRS components use direct-connect style harness connectors.
- Driver air bag module
- Front passenger air bag module
- LH side front curtain air bag module
- LH side rear curtain air bag module
- RH side front curtain air bag module
- RH side rear curtain air bag module
- Front LH seat belt pre-tensioner
- Front RH seat belt pre-tensioner
Always pull up to release locking tab prior to removing connector from SRS component. Always push down to lock locking tab after installing connector to SRS component. When locked, the locking tab is level with the connector housing.
Scheme 6
Occupant Classification System (OCS) Description
The occupant classification system (OCS) identifies different size occupants, out of position occupants, and detects if child seat is present in the front passenger seat. The OCS receives inputs from the occupant classification sensor (located inside the passenger seat cushion assembly) and belt tension sensor (part of the passenger front seat belt assembly and located at the belt anchor location). Depending on classification of the passenger, the OCS sends a signal to the air bag diagnosis sensor unit. The air bag diagnosis sensor unit uses this signal and the seat belt buckle switch RH signal to determine deployment or non deployment of the passenger front air bag in the event of a collision. Depending on the signals received, the air bag diagnosis sensor unit can disable the passenger front air bag completely.
Note. In case of customer concern, SDT can be used to confirm the passenger air bag status (readiness).
Passenger Air Bag Status Conditions
| Front Passenger Seat (Condition) | PASS AIR BAG OFF Indicator (Status) | Passenger Air Bag Status (Readiness) | SDT Display |
|---|---|---|---|
| Seat occupied | OFF | Active (enabled) | ON |
| Seat occupied (1) | ON | Deactivated (disabled) | OFF |
| Seat empty | OFF | Deactivated (disabled) | OFF |
| NOTE: (1) Passenger does not meet Occupant Classification System specifications for passenger air bag activation. | |||
| NOTE |
|---|
| (1) Passenger does not meet Occupant Classification System specifications for passenger air bag activation. |
| (1) | Passenger does not meet Occupant Classification System specifications for passenger air bag activation. |
PASSENGER AIR BAG STATUS CONDITIONS CHART
Scheme 7
Passenger Seat Belt Warning System: System Description
The passenger seat belt warning system will remind the driver if the driver or front passenger seat belt should be buckled by turning on the seat belt warning light (1). The system works in conjunction with the occupant classification system. Refer to [ OCCUPANT CLASSIFICATION SYSTEM (OCS) DESCRIPTION ].
Scheme 8
Passenger Seat Belt Warning System Operation
| Driver seat status (Ignition switch ON) | Passenger seat status | Seat belt buckle switch LH status | Seat belt buckle switch RH status | Seat belt warning lamp |
|---|---|---|---|---|
| Seat occupied | Seat occupied | Buckled | Buckled | Off |
| Unbuckled | On | |||
| Seat unoccupied | Off | |||
| Unbuckled | On |
PASSENGER SEAT BELT WARNING SYSTEM OPERATION CHART
Scheme 9
Scheme 10
Scheme 11
OBD System: Trouble Diagnosis Introduction
| CAUTION | Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connectors. Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it with a new one. Keep ground connections clean. |
C/U Identification Number
After replacing the diagnosis sensor unit, confirm that the diagnosis sensor unit identification is correct for the vehicle as equipped. Refer to [ SDT FUNCTION (AIRBAG) ].