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GENERAL INFORMATION


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 front air bag(s) in case of a frontal collision. In addition, the side-airbag and curtain air bag inflates upon a side collision to reduce the risk of passenger injuries.
The SRS front air bags from an advanced air bag system together with sensors at the vehicle and sensors attached to front seats.
With the knee air bag system, when an impact exceeds the threshold upon a frontal collision, and the cushion air bag is instantaneously inflated for better protection of the driver.
Side-airbag systems in the front seats are activated when side impacts exceed a criteria to protect the occupants’ upper bodies.
The curtain air bag system operates together with the side-airbag to protect the heads of passengers in the front and second seats.
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 is used to control the activation and deactivation of the pre-tensioner.
The SRS consists of driver’s and passenger’s (front) air bag modules, knee air bag module, side-airbag modules, curtain air bag modules, SRS air bag control unit (SRS-ECU), two front impact sensors, two side impact sensors, SRS warning light, passenger’s air bag OFF indicator light, passenger’s seat belt warning light, clock spring, seat belt pre-tensioner, seat belt buckle switch, seat slide sensor, weight sensor and occupant classification-ECU. Driver’s and passenger’s (front) air bag modules are located in the center of the steering wheel and above the glove box. The knee air bag module is installed to the instrument panel cover lower under the steering column. Side-airbags are located inside the front seatback frame. 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). 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 headlight support panel upper 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 weight sensor is installed underneath a rail of the passenger seat to detect the load on the seat. The passenger’s air bag OFF indicator light is installed to the lower left of the center panel, and illuminates when the passenger seat airbag is inactive. The passenger’s seat belt warning light is installed to the lower right of the center panel, 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 this manual carefully before starting any such work.

ON-BOARD DIAGNOSTIC/SRS WARNING LIGHT FUNCTION

The SRS-ECU 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, the SRS warning light, passenger’s air bag OFF indicator light and passenger’s seat belt 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 this manual.

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. The label I is not to be removed except by owner. If the other labels are dirty or damaged, replace them.


Label contents
A, B
 DANGER
FLAMMABLE EXPLOSIVE
DO NOT:
DISASSEMBLE; HEAT; INCINERATE; APPLY ELECTRICITY;
OR STORE AT HIGH TEMPERATURE (93°C or HIGHER).
REFER TO WORKSHOP MANUAL FOR DETAILS.
C
 CAUTION:
DO NOT DISASSEMBLE OR DROP. IF DEFECTIVE, REFER TO SERVICE MANUAL.
D
 DANGER
FLAMMABLE EXPLOSIVE
SRS AIR BAG MODULE

  • Do not disassemble or shock.
  • Do not heat or incinerate.
  • Do not contact with electricity or tester probes.
  • Do not test or diagnose.
  • Do not store in more than 200°F (93°C).
  • Store the air bag cover is top.
  • For information on handing, replacement, and disposal methods, refer to the service manual.
E<EXCEPT VEHICLES FOR CANADA>

 WARNING
EVEN WITH ADVANCED AIR BAGS

  • Children can be killed or seriously injured by the air bag
  • The back seat is the safest place for children
  • Never put a rear-facing child seat in the front
  • Always use seat belts and child restraints
  • See owner’s manual for more information about air bags
E <VEHICLES FOR CANADA>

 WARNING
DEATH or SERIOUS INJURY can occur

  • Children 12 and under can be killed by the air bag.
  • The BACK SEAT is the SAFEST place for children.
  • NEVER put a rear-facing child seat in the front.
  • Sit as far back as possible from the air bag.
  • ALWAYS use SEAT BELTS and CHILD RESTRAINTS.
F
 SEAT BELT PRETENSIONER CAUTION
THIS ASSEMBLY CONTAINS AN EXPLOSIVE INITIATOR.
DANGER FLAMMABLE MATERIAL
TO PREVENT PERSONAL INJURY

  • DO NOT REMOVE. INSTALL IT INTO ANOTHER VEHICLE.
  • SERVICE OR DISPOSE OF IT AS DIRECTED IN THE REPAIR MANUAL.
  • DO NOT DISMANTLE INCINERATE OR BRING INTO CONTACT WITH ELECTRICITY.
G
 WARNING
SRS AIR BAG MODULE 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.
H
 DANGER CONTAINS HIGH-PRESSURE GAS AND FLAMMABLE MATERIAL
To avoid injury, NEVER; [Repair, Disassembly, Incinerate, Bring into contact with electricity, Install onto another vehicle or Store where the temperature is above 93°C (200°F)] -See Repair Manual for details.-
I
 SRS SIDE AIRBAG
WARNING
TO AVOID SERIOUS
INJURY OR DEATH:

  • Do not lean against the door.
  • Do not use seat covers.
See owner’s manual for more information
J <EXCEPT VEHICLES FOR CANADA>
 This Vehicle is Equipped with Advanced Air Bags
Even with Advanced Air Bags
Children can be killed or seriously injured by the air bag.
The back seat is the safest place for children.
Never put a rear-facing child seat in the front.
Always use seat belts and child restraints.
See owner’s manual for more information about air bags.
Not to be removed except by owner.
J <VEHICLES FOR CANADA>
 WARNING
MISE EN GARDE
Children Can Be KILLED or INJURED by Passenger Air Bag
The back seat is the safest place for children 12 and under.
Make sure all children use seat belts or child seats.
Not to be removed except by owner.

SCHEMATIC




SRS AIR BAG SPECIAL CONNECTOR
To enhance the system reliability, a connector short circuiting mechanism is integrated in the SRS-ECU connector, air bag module connectors, clock spring connector, pre-tensioner connectors, and intermediate connector between curtain air bag module and SRS-ECU (black connector "A" shown in the figure).

SQUIB CIRCUIT CONNECTOR LOCK SWITCH




This mechanism prevents the improper deployment of air bag module because of the current application to the squib due to the static electricity when connectors between SRS-ECU and air bag modules (squibs) are disconnected. When the connector is disconnected, the short spring short circuits the power supply side terminal and ground side terminal of squibs, and prevents the static electricity from generating the potential difference. This connector mechanism is adopted for the following connectors.

CONFIGURATION DIAGRAMS

A-38 (Y)
Front impact sensor (LH)

A-41 (Y)
Front impact sensor (RH)

C-04

Combination meter

C-16 (Y)
Passenger’s (Front) air bag module

C-18 (Y)
Center panel assembly

C-30 (Y)
SRS-ECU

C-33 (B)
Knee air bag module

C-34 (B)
Date link connector

C-122 (Y)
SRS-ECU

C-207 (Y)
Driver’s air bag module

C-208 (Y)
Clock spring

D-21 (B)
Seat belt pre-tensioner (LH)

D-22 (Y)
Side impact sensor (LH)

D-28 (GR)
Seat slide sensor

D-30 (Y)
Side-airbag module (LH)

D-32 (Y)
Side-airbag module (RH)

D-33 (B)
Seat belt switch (Passenger’s side)

D-35
Front seat assembly (RH) (weight sensor, occupant classification-ECU)

D-36 (B)
Seat belt pre-tensioner (RH)

D-37 (Y)
Side impact sensor (RH)

F-05 (B)
Curtain air bag module (RH)

F-24 (B)
Curtain air bag module (LH)

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 ): replace the wiring if necessary, after reading and following all precautions and procedures in this manual.
  • Do not use an analog ohmmeter to check the SRS wiring or components; use only the special tools (refer to ) and a digital multi-meter (refer to ).
caution Improper services cause the system to be inoperative. Do not disassemble or tamper with the SRS components to prevent the serious injury.










COMPONENT LOCATION




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