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RS-2
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
RS0SQ-01
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 generator, etc., and inflates the bag when
instructed by the airbag sensor assembly.
H09687
2. SPIRAL CABLE
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
H10692
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 generator, etc., and in-
flates the bag when instructed by the airbag sensor assembly.
H10573
4. SIDE AIRBAG ASSEMBLY
The inflater and bag of the SRS side airbag are stored in the
side 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 side airbag sensor assem-
bly.
H13342
2002 ECHO (RM884U)
Author : Date : 1125
RS-3
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
2-Door:
5. SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front
seat outer belt. The pretensioner contains a squib, gas genera-
tor, wire, piston, etc., and operates in the event of a frontal colli-
sion.
4-Door:
H13440
6. 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 operation conditions when the ignition switch is
turned to the ON position, the light goes on for about 6 seconds
and then goes off.
H12912
7. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
panel. The airbag sensor assembly consists of an airbag sen-
sor, safing sensor, diagnosis circuit, ignition control and drive
circuit, etc. It receives signals from the airbag sensor and
judges whether the SRS must be activated or not.
H10581
8. 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.
H13121
2002 ECHO (RM884U)
Author : Date : 1126
RS-4
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
2 - Door:
9. SIDE AIRBAG SENSOR ASSEMBLY
The side airbag sensor assembly is mounted in the LH and RH
center pillars. The side airbag sensor assembly consists of a
side airbag, sensor, safing sensor and diagnosis circuit, etc. It
sends signals to the airbag sensor assembly to judges whether
the SRS side airbag must be activated or not.
4 - Door:
H17205
2 - Door: 10. DOOR SIDE AIRBAG SENSOR
A door side airbag sensor is mounted on each of the door inside
panel. The sensor unit is a mechanical type. When the sensor
detects deceleration force above a predetermined limit, contact
is made in the sensor, sending a signal to the airbag sensor as-
sembly. The sensor cannot be disassembled.
H13128
2002 ECHO (RM884U)
Author : Date : 1127
RS-5
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
11. SRS CONNECTORS
7 Side Airbag Sensor
Assembly (RH)
8 Side Airbag Sensor
Assembly (RH) (Squib)
9 Seat Belt Pretensioner
(RH)
10 11 Door Side Airbag
Sensor (RH)
12 13
Front Airbag Sensor (RH)
2 6 Front Passenger
Airbag 1 Airbag Assembly (Squib)
Spiral Cable
Sensor 4 5
Assembly 3 Steering Wheel
Pad (Squib)
14 15
Front Airbag Sensor (LH)
16 17 Door Side Airbag
Sensor (LH)
18 Seat Belt Pretensioner
(LH)
19 Side Airbag Sensor
Assembly (LH) (Squib)
20 Side Airbag Sensor
Assembly (LH)
H12007
No. Item Application
Connectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
(1) Terminal Twin-Lock Mechanism
17, 18, 19, 20
(2) Airbag Activation Prevention Mechanism Connectors 1, 2, 3, 4, 5, 6, 8, 19
(3) Electrical Connection Check Mechanism Connectors 1, 2, 3
2002 ECHO (RM884U)
Author : Date : 1128
RS-6
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(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 the SRS
are used in the locations shown on the previous page to
ensure high reliability. These connectors use durable
gold-plated terminals.
Spacer
(1) Terminal twin-lock mechanism:
Each connector has a two-piece component 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 retainer and the lance) to prevent
terminals from coming out.
(2) Airbag activation prevention mechanism:
Each connector contains a short spring plate. When
Female Male Z05953 the connector is disconnected, the short spring
plate automatically connects positive (+) terminal
and negative (-) terminal of the squib.
When Connector is Connected When Connector is Disconnected
Short Spring Plate
Short Spring Plate
Housing Contacting Male Terminal
Housing
Short Spring Plate ON
Terminal
Squib Squib
Connectors Short Spring Plate Closed Circuit R10587
2002 ECHO (RM884U)
Author : Date : 1129
RS-7
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
HINT:
The type of connector is shown in the diagram on the previous
page.
(3) Electrical connection check mechanism:
SRS This mechanism electrically checks that connectors
Warning
Light are connected correctly and completely. The electri-
cal connection check mechanism is designed so
Disconnection that the disconnection detection pin connects with
Detection
Pin the diagnosis terminals when the connector hous-
ing lock is locked.
Airbag Sensor Assembly R12076
FHalf Connection FComplete Connection
Terminal for Diagnosis Terminal for
Diagnosis
Disconnection Detection Pin
H01315
HINT:
The connectors shown in this illustration are connectors, "1", "2"
and "3" in step 8.
2002 ECHO (RM884U)
Author : Date : 1130
RS-8
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(4) Connector Twin-Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by 2 locking devices to in-
crease the connection reliability. If the primary lock
is incomplete, ribs interfere and prevent the sec-
ondary lock.
Secondary Lock
Lock Lock
Primary Lock
Primary Lock Incomplete Primary Lock Complete Twin-Lock Completed
(Secondary Lock Prevented) (Secondary Lock Permitted) AB0089
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the pre-
determined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller decelera-
tion rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the deceleration sen-
Fig.1 sor go on simultaneously. When a deceleration force acts
on the sensors, 2 squibs in the driver airbag and front pas-
Power Source senger airbag ignite and generate gas. The gas discharg-
ing into the driver airbag and front passenger airbag rap-
idly increases the pressure inside the bags, breaking
Safing
open the steering wheel pad and instrument panel door.
Sensor Bag inflation then ends, and the bags deflate as the gas
Squibs
is discharged through discharge holes at the bag's rear or
side.
Fig.2
Deceleration Sensor
Z14034
2002 ECHO (RM884U)
Author : Date : 1131
RS-9
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
Outer 12. DISCONNECTION OF CONNECTORS FOR FRONT
AIRBAG SENSOR, SIDE AIRBAG SENSOR AND
DOOR SIDE AIRBAG SENSOR
(a) While holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
(b) Lock of the connectors is released, then disconnect the
connectors.
HINT:
H01581 Make sure to hold both flank sides of the outer. If holding the top
and bottom sides, it will obstruct disconnection.
Lock of connector is released
Disconnection is completed
H01582
13. CONNECTION OF CONNECTORS FOR FRONT AIR-
BAG SENSOR, SIDE AIRBAG SENSOR AND DOOR
SIDE AIRBAG SENSOR
Outer Outer
H01583
(a) Align the male connector (of 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.)
2002 ECHO (RM884U)
Author : Date : 1132
RS-10
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
HINT:
S Do not fit in while holding the outer.
S When fitting in, the outer slides. Do not touch it.
14. DISCONNECTION OF SIDE AIRBAG CONNECTOR
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.
Slider Slider
Disconnection is completed
H01584
15. CONNECTION OF SIDE AIRBAG CONNECTOR
Slider Slider
H01585
2002 ECHO (RM884U)
Author : Date : 1133
RS-1 1
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
(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 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 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.
16. 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 ECHO (RM884U)
Author : Date : 1134
RS-12
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
17. 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 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 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 ECHO (RM884U)
Author : Date : 1135
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