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RS-2
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
RS0B7-05
OPERATION
1. STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering wheel
pad and cannot be disassembled. The inflater contains a squib,
igniter charge, gas generant, etc., and inflates the bag when
instructed by the airbag sensor assembly.
H02147
2. SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
Spiral Cable H01263
3. FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front passen-
ger airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge and gas generant, etc., and in-
flates the bag when instructed by the airbag sensor assembly.
H07350
4. SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front
seat outer belt. The pretensioner contains a squib, gas gener-
ant, strip, etc., and operates in the event of a frontal collision.
H07351
5. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly self-diagno-
sis. In normal operating conditions when the ignition switch is
turned to the ACC or ON position, the light goes on for about 6
seconds and then goes off.
W01632
2002 4RUNNER (RM887U)
Author : Date : 1421
RS-3
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
6. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
center cluster. The airbag sensor assembly consists of airbag
sensor, safing sensor, diagnosis circuit, ignition control and
drive circuit, etc.
It receives signals from the airbag sensor assembly and judges
whether the SRS must be activated or not.
H09167
7. FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the side
members. The sensor unit is a mechanical type. When the sen-
sor detects deceleration force above a predetermined limit,
contact is made in the sensor, sending a signal to the airbag
sensor assembly. The sensor cannot be disassembled.
H07352
2002 4RUNNER (RM887U)
Author : Date : 1422
RS-4
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
8. SRS CONNECTORS
4
Seat Belt
Pretensioner (RH)
5
Front Airbag
Sensor (RH)
6
Front Passenger Airbag
Assembly (Squib)
2
Steering Wheel
Spiral Cable Pad (Squib)
1 7 8
Airbag Sensor
Assembly
3
9
No.1 J/B
10 11
Front Airbag
Sensor (LH)
12
Seat Belt
Pretensioner (LH)
H07353
No. Item Application
(1) Terminal Twin-Lock Mechanism Connectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
(2) Airbag Activation Prevention Mechanism Connectors 1, 2, 3, 4, 6, 7, 8, 12
(3) Electrical Connection Check Mechanism Connectors 1, 2, 3
(4) Connector Twin-Lock Mechanism Connectors 7, 9
(a) All connectors in the SRS are colored in yellow to distin-
guish them from other connectors. Connectors having
special functions and specifically designed for SRS are
used in the locations shown above to ensure high reliabil-
ity. These connectors use durable gold-plated terminals.
2002 4RUNNER (RM887U)
Author : Date : 1423
RS-5
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(1) Terminal Twin-Lock Mechanism
Spacer
Each connector has a two-piece construction con-
sisting of a housing and a spacer. This design en-
Housing
ables the terminal to be locked securely by two lock-
ing devices (the spacer and the lance) to prevent
terminals from coming out.
Female Male
Z05953
(2) Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When
the connector is disconnected, positive (+) terminal
and negative (-) terminal of the squib are attached.
F When Connector is Connected F When Connector is Disconnected
Short Spring Plate
Short Spring Plate
Contacting Male Terminal
Housing
Housing
Terminal Short Spring Plate ON
Squib Squib
Connectors Short Spring Plate Closed Circuit
R10587
HINT:
The type of connector shown above is used for the connectors
"1", "2", "3", "4", "6", "7", "8" and "12" in the diagram on the pre-
vious page, but the operating principle is the same.
2002 4RUNNER (RM887U)
Author : Date : 1424
RS-6
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(3) Electrical Connection Check Mechanism
SRS This mechanism is designed to electrically check if
Warning Light
connectors are connected correctly and complete-
Disconnection ly. The electrical connection check mechanism is
Detection designed so that the connection detection pin con-
Pin nects with the diagnosis terminals when the con-
nector housing lock is in the locked condition.
Airbag Sensor Assembly R12076
D Half Connection D Complete Connection
Terminal for Diagnosis Terminal for Diagnosis
Disconnection Detection Pin
H01315
(4) Connector Twin-Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by two locking devices to in-
crease connection reliability.
If the primary lock is incomplete, ribs interfere and prevent the
secondary lock.
Secondary Lock
Primary Lock Lock Lock
Primary Lock Incomplete Primary Lock Complete Twin-Lock Completed
(Secondary Lock Prevented) (Secondary Lock Permitted)
Z05490
2002 4RUNNER (RM887U)
Author : Date : 1425
RS-7
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than a prede-
termined level, the SRS is activated automatically. A saf-
ing sensor is designed to go on at a smaller deceleration
rate than the airbag sensors. As illustrated in Fig. 2, igni-
tion is caused when a safing sensor and the deceleration
sensor go on simultaneously. When a deceleration force
Fig.1
acts on the sensors, two squibs in the driver airbag and
front passenger airbag ignite and generate gas. The gas
Power Source
discharging into the driver and front passenger airbags
rapidly increases the pressure inside the bags breaking
open the steering wheel pad and instrument panel door.
Bag inflation then ends, and the bags deflate as the gas
Safing
Sensor is discharged through discharge holes at the bag's rear or
Squibs
side.
Fig.2
Deceleration
Sensor Z14034
9. DISCONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.
Slider Slider
Disconnection is completed
H01586
2002 4RUNNER (RM887U)
Author : Date : 1426
RS-8
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
10. CONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Align a lock part of male connector and a slider of female
connector in the same direction as shown in the illustra-
tion, fit in them without rubbing.
(b) Make sure to insert until they are locked. After fitting in pull
them lightly to check that they are locked. (When locked,
make sure that the outer returns to its original position and
sound at the time of fitting in can be heard.)
HINT:
S As the slider slides, do not touch it.
S Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.
Slider Slider
H01587
2002 4RUNNER (RM887U)
Author : Date : 1427
RS-9
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
11. DISCONNECTION OF FRONT AIRBAG SENSOR CON-
Outer NECTOR
(a) While holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
(b) When lock of the connectors is released, disconnect the
connectors.
HINT:
Make sure to hold both flank sides of the outer. If holding the top
H02763 and bottom sides, it will obstruct disconnection.
Lock of connector is released
Disconnection is completed
H02764
12. CONNECTION OF FRONT AIRBAG SENSOR CON-
NECTOR
(a) Align the male connector (on the side of sensor) and fe-
male connector in the same direction as shown in the il-
lustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it un-
til the outer returns to its original position again.
If fitting stops half way, connectors will separate.
(c) Make sure to insert until they are locked. After fitting in,
pull them slightly to check that they are locked. (When
locked, make sure that the outer returns to its original
position and sound at the time of fitting in can be heard.)
HINT:
S Do not fit in while holding the outer.
S When fitting in, the outer slides. Do not touch it.
Outer Outer
H02768
2002 4RUNNER (RM887U)
Author : Date : 1428
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