Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 18 srsair oper
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RS-2
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
RS0S1-01
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 generant, etc., and inflates the bag when
instructed by the airbag sensor assembly.
H02706
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 R09725
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.
H02707
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, gas generator, etc., and in-
flates the bag when instructed by the airbag sensor assembly.
H17024
5. 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, wire, piston, etc., and operates in the event of a frontal colli-
sion.
H02610
2001 SIENNA (RM787U)
Author : Date : 1452
RS-3
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
6. SRS WARNING LIGHT
w/ Tachometer:
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. In normal
operation conditions when the ignition switch is turned to the
ACC or ON position, the light goes on for approx. 6 seconds and
then goes off.
w/o Tachometer:
H02719
7. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center cluster finish panel. The airbag sensor assembly
consists of an airbag sensor, safing sensor, diagnosis circuit
and ignition control, drive circuit, etc. It receives signals from the
airbag sensor and judges whether the SRS must be activated
or not.
H02708
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.
H04220
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 lat-
eral deceleration sensor, safing sensor, diagnosis circuit, etc.
It sends signals to the airbag sensor assembly to judge whether
the SRS side airbag must be activated or not. The side airbag
sensor assembly cannot be disassembled.
H17023
2001 SIENNA (RM787U)
Author : Date : 1453
RS-4
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
10. SRS CONNECTORS
HINT:
SRS connectors are located as shown in the following illustra-
tion.
7
Side Airbag Sensor
Assembly (RH)
8
Side Airbag
Assembly (RH) (Squib)
9
Seat Belt
Pretensioner (RH)
11 10
Front Airbag Sensor (RH)
2 6
Front Passenger Airbag
Assembly (Squib)
Airbag Sensor 1
Spiral Cable
Assembly 4 5
3 Steering Wheel
Pad (Squib)
12
Front Airbag Sensor (LH)
13
Seat Belt
Pretensioner (LH)
14
Side Airbag
Assembly (LH) (Squib)
15
Side Airbag Sensor
Assembly (LH)
H16279
No. Item Application
(1) Terminal Twin-Lock Mechanism Connectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
(2) Airbag Activation Prevention Mechanism Connectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 13, 14
(3) Electrical Connection Check Mechanism Connectors 1, 2, 3
2001 SIENNA (RM787U)
Author : Date : 1454
RS-5
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 2 locking
devices (the retainer and the lance) to prevent ter-
minals from coming out.
(2) Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When
Female Male H03988 the connector is disconnected, the short spring
plate automatically connects the power source and
grounding terminals 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
2001 SIENNA (RM787U)
Author : Date : 1455
RS-6
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
Terminal for Diagnosis Diagnosis
Disconnection Detection Pin
H01315
HINT:
The illustration shows connectors "1", "2" and "3" in step 11.
2001 SIENNA (RM787U)
Author : Date : 1456
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 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.
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
Outer 11. DISCONNECTION OF CONNECTORS FOR FRONT
AIRBAG SENSOR AND 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:
Be sure to hold both flank sides of the outer. If holding the top
H01581 and bottom sides, it will obstruct disconnection.
Lock of connector is released
Disconnection is completed
H01582
2001 SIENNA (RM787U)
Author : Date : 1457
RS-8
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
12. CONNECTION OF CONNECTORS FOR FRONT AIR-
BAG SENSOR AND 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) Be 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.
2001 SIENNA (RM787U)
Author : Date : 1458
RS-9
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
13. 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
14. CONNECTION OF SIDE AIRBAG CONNECTOR
Slider Slider
H01585
2001 SIENNA (RM787U)
Author : Date : 1459
RS-10
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) Be 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.
15. 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
2001 SIENNA (RM787U)
Author : Date : 1460
RS-1 1
SUPPLEMENTAL RESTRAINT SYSTEM - SRS AIRBAG
16. 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) Be 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
2001 SIENNA (RM787U)
Author : Date : 1461
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