General Description

GENERAL DESCRIPTION

NOTE:
In these instructions, the part names are changed from the names in owner's manual into the following names.

- Driver's seat position sensor-> Seat slide sensor
- Passenger's seat weight sensor-> Occupant classification sensor
- Seat belt buckle switch-> Seat belt switch
- Passenger air bag off indicator-> Passenger air bag OFF indicator light
- Front passenger seat belt warning light-> Passenger seat belt warning light

WARNING:
Improper service could result in serious injury of the service personnel or the passenger.

The SRS is designed to supplement the front seat belts. It reduces injury to the driver(s) and the front passenger(s) by deploying air bag(s) in case of a head-on collision.
The SRS front air bags form an advanced air bag system together with sensors at the vehicle and sensors attached to the front seats.

Side-airbag systems in the front seats are activated when side impacts exceed criteria to protect the occupants' upper bodies.

The curtain air bag systems are activated when side impacts applied to the vehicle exceed criteria, to protect the heads of the occupants in the front seats. [ECLIPSE]

The seat belts with pre-tensioner work simultaneously with the SRS. The seat belt incorporating the pre-tensioner automatically winds the seat belt upon front impact to reduce forward shifting of the driver's and passenger's. The seat belt use status controls the activation and deactivation of the pre-tensioner.

The SRS consists of six air bag modules, SRS air bag control unit (SRS-ECU), two front impact sensors, two side impact sensors, SRS warning light, passenger air bag OFF indicator light, passenger seat belt warning light, clock spring, seat belt pre-tensioner, seat belt switch, seat slide sensor, occupant classification sensor and occupant classification-ECU. Air bag modules are located in the center of the steering wheel and above the glove box. Side-airbags are located inside the front seatback assemblies. The curtain air bag module consists of an air bag, an inflator, and the fixing gear relating to those parts, and is installed in the roof side sections
(from the driver's and the passenger's front pillars to the rear pillars). [ECLIPSE]
Each air bag consists of a folded air bag and an inflator unit. The SRS-ECU placed on the forefront of the floor monitors the system and has a front air bag safing G-sensor, front air bag analog G-sensor and a side-airbag safing G-sensor. The front impact sensor is assembled in the radiator support panel to monitor impact in case of front impact. The side impact sensors inside the center pillars monitor the shock incurred by the sides of the vehicle. The SRS warning light on the combination meter indicates the operational status of the SRS. The clock spring is installed in the steering column. The seat belt pre-tensioner is built into the driver's and passenger's front seat belt retractor. The seat slide sensor is installed at the seat adjuster section of the driver seat in order to detect the driver seat slide position. The occupant classification sensor is installed underneath a rail of the passenger seat to detect the load on the seat. The passenger air bag OFF indicator light is installed to the lower left of the multi-center display, and illuminates when the passenger seat air bag is inactive. The passenger seat belt warning light is installed to the lower right of the multi-center display, and illuminates when the passenger is not wearing the seat belt. The seat belt switch detects whether the seat belt is used.
Only authorized service personnel should do work on or around the SRS components. Those service personnel should read these instructions carefully before starting any such work.

ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT FUNCTION





The diagnosis unit monitors the SRS system and stores data concerning any detected faults in the system. When the ignition switch is in "ON" position, the SRS warning light should illuminate for about seven seconds and then turn "OFF." That indicates that the SRS system is in operational order. If the SRS warning light does any of the following, the immediate inspection by an authorized dealer is needed:
1. The SRS warning light does not illuminate as described above.
2. The SRS warning light stays on for more than seven seconds.
3. The SRS warning light illuminates while driving.
If a vehicle's SRS warning light is in any of these three conditions, the SRS system must be inspected, diagnosed and serviced in accordance with these instructions.

CONSTRUCTION DIAGRAM





NOTE:
This construction diagram shows the general view of the SRS components. For details, refer to "Schematic(), "Configuration Diagrams(), " and "Circuit Diagram()".

WARNING/CAUTION LABELS

A number of caution labels related to the SRS are found in the vehicle, as shown in the following illustrations. Follow label instructions when servicing SRS. If the labels are dirty or damaged, replace them.











SCHEMATIC





SRS AIR BAG SPECIAL CONNECTOR

To enhance the system reliability, a connector lock switch is integrated in the SRS-ECU connector, the air bag module connectors, the clock spring connector, the seat belt pretensioner connectors (black connector "A" shown in the illustration below).






SQUIB CIRCUIT CONNECTOR LOCK SWITCH

The switch is a mechanism that shorts the power supply terminal to the ground terminal automatically in the air bag squib circuit when the connector is disconnected. A "short" spring is integrated inside the connector. This spring prevents static electricity from flowing to the squib by shorting the power supply terminal to the ground terminal (i.e. there is no potential difference between the two terminals).

CAUTION:
When the connector is disconnected, there will be short circuit between the terminals. This is not a fault.





CONFIGURATION DIAGRAMS









CIRCUIT DIAGRAM

WARNING:

- Do not repair, splice, or modify the SRS wiring (except for specific repairs to the instrument panel wiring harness and the floor wiring harness shown on Technician Safety Information ): replace the wiring if necessary, after reading and following all precautions and procedures in these instructions.
- Do not use an analog ohmmeter to check the SRS wiring or components; use only the special tools (refer to Special Tool(s) ) and a digital multi-meter (refer to Test Equipment ).

CAUTION:
Improper services cause the system to be inoperative. Do not disassemble or tamper with the SRS components to prevent serious injury.

















































COMPONENT LOCATION









NOTE:
The illustration above shows the front impact sensor (LH) and the side impact sensor (RH).
The position of the front impact sensor (LH) and the side impact sensor (RH) is symmetrical to this.