GENERAL INFORMATION

note

In this manual, the part names are changed from the names in owner’s manual into the following names.

Air bag control unit → SRS-ECU
Side air bag → Side-airbag
Front passenger’s air bag off indicator lamp → Passenger’s air bag off indicator lamp
Front passenger air bag ON-OFF switch → Passenger’s air bag cut off switch
Driver’s seat position sensor → Seat slide sensor

The driver’s and passenger’s (front) air bags, side-airbags, curtain air bags and seat belts with pre-tensioner have been standard equipped on all vehicles.
Dual stage air bag system has been adopted to both driver and front passenger sides. This is consisted of the front impact sensor, seat slide sensor, SRS-ECU and dual stage inflator. Air bag is deployed in two stages according to the strength of impact received. The seat slide sensor is attached to the seat rail and provides the SRS-ECU with information on the seat position.
An inflator that does not contain sodium azide has been adopted for all types of the air bag modules.
The front air bags and pre-tensioners may not work under the following conditions:

A head-on collision is less than the threshold.
The collision is from the rear
The collision is from the side
The vehicle rolls over or is in a similar position.

The side-airbags may not work under the following conditions:

A side-collision is less than the threshold.
The collision is from the front
The collision is from the rear
The vehicle rolls over or is in a similar position.

SRS FRONT AIR BAG

Front air bag is designed to supplement the front seat belts. It eliminates or reduces injury to the front passenger(s) by deploying air bag(s) in case of a head-on collision.

SRS SIDE-AIRBAG

Side-airbag systems in the front seats are activated when sideward impacts applied to the vehicle exceed a threshold to protect the occupants’ upper bodies.

SRS CURTAIN AIR BAG

The curtain air bag systems are activated when sideward impacts applied to the vehicle exceed a threshold, to protect the heads of the occupants in the front and rear seats.

SEAT BELT WITH PRE-TENSIONER

The seat belts with pre-tensioner work simultaneously with the SRS. The seat belt incorporating the pre-tensioner automatically winds the seatbelt upon front impact to reduce forward shifting of the driver’s and passenger’s.

SYSTEM COMPONENT PARTS

The SRS and seat belt pre-tensioner systems consist of air bag modules, SRS-ECU, two front impact sensors, four side impact sensors, SRS warning lamp, clock spring, seat slide sensor, passenger’s air bag cut off switch, passenger’s air bag off indicator lamp and seat belt pre-tensioners. Airbag modules are installed at the centre of the steering wheel, on the globe box, front seatbacks and the roof-side areas (from the front pillars of driver- and passenger-side to the rear pillar in rear area of vehicle). Each air bag has a safing folded air bag and an inflator.

SRS-ECU, installed at the depths of the centre console, monitors the system.
The front impact sensor is assembled in the radiator support panel to monitor collision upon frontal impact.
The side impact sensor is assembled in the centre pillar and quarter panel lower to monitor collision upon side impact.
The warning lamp on the instrument panel indicates the operational status of the SRS.
The clock spring is installed in the steering column.
The seat slide sensor is attached to the seat rail and provides the air bag control unit with information on the seat position.
The passenger’s air bag cut off switch is located above inside the glove box.
The passenger’s air bag off indicator lamp is located above the centre panel in the instrument panel.
The seat belt pre-tensioner is incorporated in the seat belt retractor.

The SRS-ECU will start a squib ignition current to the driver’s air bag module, passenger’s (front) air bag module and seat belt pre-tensioner when simultaneously detecting frontal impact with the front impact sensor and the SRS-ECU. It will also supply a squib ignition current to the side-airbag module and curtain air bag module when simultaneously detecting side impact with the side impact sensor and the SRS-ECU.
The SRS-ECU has the following functions:

Power supply backup function that deploys or operates the air bag module and seat belt pre-tensioner within specific period, in case of power failure upon impact.
Diagnostic test mode to improve safety and reliability.

CONSTRUCTION DIAGRAM

SRS SYSTEM CIRCUIT DIAGRAM

CAUTION LABELS

Labels to indicate cautions regarding the handling and the services of SRS air bag are attached on the position shown in the following illustration.

note

^*: indicates RHD vehicles. For LHD vehicles, the specified application position of label is reversed left to right.

Label content
A	DANGER: FLAMMABLE MATERIAL TO PREVENT PERSONAL INJURY. DO NOT DISMANTLE, INCINERATE, OR BRING INTO CONTACT WITH ELECTRICITY STORE BELOW 200°F (93°C). READ SERVICE MANUAL FOR DETAIL.
B	CAUTION: SRS CLOCK SPRING THIS IS NOT A REPAIRABLE PART. IF DEFECTIVE REPLACE ENTIRE UNIT ACCORDING TO THE SERVICE MANUAL INSTRUCTIONS. TO RE-CENTRE: ROTATE CLOCKWISE UNTIL TIGHT. THEN ROTATE IN OPPOSITE DIRECTION ROUGHLY 3 3/4 TURNS AND ALIGN ARROWS >><<.
C
D	CAUTION: DO NOT DISASSEMBLE OR DROP. IF DEFECT REFER TO SERVICE MANUAL.
E	WARNING DEATH OR SERIOUS INJURY can occur. DO NOT place rear-facing child seat on this seat with airbag.
F	DANGER SEAT BELT PRE-TENSIONER CAUTION THIS ASSEMBLY CONTAINS AN EXPLOSIVE INITIATOR FLAMMABLE MATERIAL TO PREVENT PERSONAL INJURY DO NOT IMPACT, DISMANTLE OR INSTALL IT INTO ANOTHER VEHICLE. SERVICE OR DISPOSE OF IT AS DIRECTED IN THE REPAIR MANUAL.
G	WARNING FLAMMABLE/EXPLOSIVE SRS AIR BAG MODULE TO AVOID SERIOUS INJURY: DO NOT REPAIR, DISASSEMBLE OR TAMPER. AVOID CONTACT WITH FLAME OR ELECTRICITY. DO NO DIAGNOSIS/USE NO TEST EQPT OR PROBES. STORE BELOW 200°F (93°C). BEFORE DOING ANY WORK INVOLVING MODULE, READ SERVICE MANUAL FOR IMPORTANT FURTHER DATA.
H	CAUTION: DO NOT DISASSEMBLE OR DROP.
I	WARNING FLAMMABLE/EXPLOSIVE TO AVOID SERIOUS INJURY: DO NOT REPAIR, DISASSEMBLE OR TAMPER. AVOID CONTACT WITH FLAME OR ELECTRICITY. DO NO DIAGNOSIS/USE NO TEST EQPT OR PROBES. STORE BELOW 200°F (93°C). BEFORE DOING ANY WORK INVOLVING MODULE. READ SERVICE MANUAL FOR IMPORTANT FURTHER DATA.
J	CAUTION Do Not Disassemble or Alter See Owner’s Manual