Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z cistsdes
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05-761
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
05NST-01
SYSTEM DESCRIPTION
1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM
(a) General description.
(1) In this system, the airbag sensor assy center installed on the floor under the A/C unit determines
whether or not to activate the SRS airbags (driver airbag, passenger airbag, front seat airbags
and curtain shield airbags) and seat belt pretensioners by receiving the collision signal from each
sensor (excluding the airbag sensor assy center). When there is trouble in the system, the airbag
sensor assy center turns on the SRS warning light on the combination meter assy to inform the
driver.
(b) Description of the dual stage control.
(1) The airbag sensor assy center controls the dual stage deployment of the driver airbag in the horn
button assy and the passenger airbag on the instrument panel. The airbag sensor assy center
controls the dual stage deployment of the driver airbag according to the collision impact, seat
position and seat belt ON/OFF state. It also controls the dual stage deployment of the passenger
airbag according to the collision impact and seat belt ON/OFF state.
2. IGNITION JUDGEMENT AND CONDITIONS
(a) Operation in case of front collision.
(1) When the vehicle collides in the hatched area (Fig.1) and shock is larger than a predetermined
level, the airbags (driver and front passenger) are activated automatically. The deceleration sen-
sor of the airbag sensor assy center determines the need for ignition in response to collisions
within the hatched area based on the signal from the deceleration sensor of the front airbag sen-
sor.
(2) Safing sensor of the airbag sensor assy center is designed to activate at a smaller deceleration
rate than the deceleration sensor. As illustrated in Fig. 2 below, when both the safing sensor and
deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.
Airbag Sensor Assy Center
Safing Sensor
ON
AND Airbag Inflating
Deceleration
Sensor ON
Fig. 1 Fig. 2
H44048
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 944
05-762
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
(b) w/ Side airbag:
Operation in case of front side collision.
(1) Electronic safing sensor of the side airbag sensor assy is designed to activate at a smaller decel-
eration rate than the deceleration sensor of the side airbag sensor assy. As illustrated below,
when both the safing sensor and deceleration sensor go on simultaneously, current flows to the
squib and ignition occurs.
Airbag Sensor Assy Center
Electronic Safing
Sensor ON
AND Airbag Inflating
Deceleration
Sensor ON
Side Airbag Sensor Assy
H44049
(c) w/ Side airbag:
Operation in case of rear side collision.
(1) Electronic safing sensor of the airbag sensor assy center is designed to activate at a smaller de-
celeration rate than the deceleration sensor of the airbag sensor rear. As illustrated below, when
both the safing sensor and deceleration sensor go on simultaneously, current flows to the squib
and ignition occurs.
Airbag Sensor Assy Center
Front Seat Airbag Assy
Deployment
Airbag Sensor Assy Center
Electronic Safing
Sensor ON
OR Airbag Inflating
Airbag Sensor Rear AND
Deceleration
Sensor ON
H44901
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 945
05-763
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM
(a) GENERAL DESCRIPTION.
(1) In the front passenger occupant classification system, the occupant classification ECU calcu-
lates the weight of the occupant based on a signal from the occupant classification sensor. This
system recognizes the occupant to be a child if it detects a weight of less than 36 kg (79.37 lb),
and disables the front and side airbags.
(2) This system is mainly comprised of 4 occupant classification sensors that detect the load on the
front passenger seat. The occupant classification ECU controls the system, and the passenger
airbag ON/OFF indicator light indicates the ON/OFF condition of the front passenger airbag and
front passenger seat airbag assy.
(b) OCCUPANT CLASSIFICATION SENSOR.
(1) The occupant classification sensors are installed on the 4 brackets connecting the seat rail and
seat frame. Accordingly, when a load is applied to the passenger seat by an occupant sitting in
it, the occupant classification sensors register a distortion.
Occupant
Classification Sensor
Occupant
Classification Sensor
Occupant
Classification ECU
Occupant Load
A
Occupant
A A - A Cross Section
Classification Sensor
H44065
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 946
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