2007 TOYOTA SIENNA Service Repair Manual

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Page 2993 of 3000

TOYOTA SIENNA 2007 Service Repair Manual RS–16SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
2. CONSTRUCTION AND OPERATION
(a) FRONT AIRBAG SENSOR
(1) The front airbag sensors are installed on the
right and left radiator supports re

RS–16SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
2. CONSTRUCTION AND OPERATION
(a) FRONT AIRBAG SENSOR
(1) The front airbag sensors are installed on the
right and left radiator supports respectively.
(2) The front airbag sensor uses an electrical type
deceleration sensor.
(3) The deceleration sensor is built into the front
airbag sensor, and the distortion that is created
in the sensor is converted into an electric signal
based on the vehicle deceleration rate during a
frontal collision. Accordingly, the extent of the
initial collision can be detected in detail.
(b) SIDE AIRBAG SENSOR
(1) The side airbag sensors are installed on the
bottom of the right and left center pillars
respectively.
(2) The side airbag sensor uses an electrical type
deceleration sensor.
(3) The deceleration sensor is built into the side
airbag sensor, and the distortion that is created
in the sensor is converted into an electric signal
based on the vehicle deceleration rate during a
front side collision. Accordingly, the extent of the
initial collision can be detected in detail.
(c) REAR AIRBAG SENSOR
(1) The rear airbag sensors are installed on the right
and left rear pillars respectively.
(2) The rear airbag sensor uses an electrical type
deceleration sensor.
(3) The deceleration sensor is built into the rear
airbag sensor, and the distortion that is created
in the sensor is converted into an electric signal
based on the vehicle deceleration rate during a
rear side collision. Accordingly, the extent of the
initial collision can be detected in detail.
(d) CENTER AIRBAG SENSOR ASSEMBLY
(1) General
• The center airbag sensor assembly is
installed on the center floor under the
instrument panel.
• The center airbag sensor assembly consists
of the deceleration sensor, safing sensor,
ignition control circuit and diagnostic circuit.
• The center airbag sensor assembly receives
signals from the deceleration sensor and
safing sensor built into the center airbag
sensor assembly and front airbag sensor and
determines whether or not the driver airbag,
front passenger airbag, and front seat belt
pretensioners should be activated, and
diagnoses system malfunctions.

Page 2994 of 3000

TOYOTA SIENNA 2007 Service Repair Manual SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–17
RS
• The center airbag sensor assembly receives
signals from the deceleration sensor and the
safing sensor built into the center airbag
se

SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–17
RS
• The center airbag sensor assembly receives
signals from the deceleration sensor and the
safing sensor built into the center airbag
sensor assembly and the side airbag sensor
and the rear airbag sensor, and determines
whether or not the front seat side airbag and
curtain shield airbag assemblies should be
activated, and diagnoses system
malfunctions.
• The center airbag sensor assembly sends the
airbag deployment signal to the ECM through
BEAN and CAN to operate fuel pump control.
• The center airbag sensor assembly sends the
airbag deployment signal to the main body
ECU through a discrete line to operate
collision door lock release control.
(2) Deceleration sensor and ignition control circuit
• The deceleration sensor is built into the
center airbag sensor assembly, front airbag
sensor, side airbag sensor and rear airbag
sensor, and the distortion created based on
the deceleration of the vehicle during a
frontal, front side or rear side collision is
converted into an electric signal.
• The ignition control circuit performs
calculations based on the signal output from
the deceleration sensors of the center airbag
sensor assembly, front airbag sensor, side
airbag sensor and rear airbag sensor. If the
calculated values are greater than the
specified values, it activates an ignition
operation.
(3) Safing sensor
• The safing sensor is built into the center
airbag sensor assembly. During a frontal
collision, the sensor turns on and outputs an
ON signal to the center airbag sensor
assembly if a deceleration rate greater than
the specified value is applied to the safing
sensor.
(4) Backup power source
• The backup power source consists of a
power supply capacitor and a DC-DC
converter. If the power system does not
function during a collision, the power supply
capacitor discharges and supplies electric
power to the system. The DC-DC converter
operates as a boosting transformer when the
battery voltage falls below a predetermined
level.

Page 2995 of 3000

TOYOTA SIENNA 2007 Service Repair Manual RS–18SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
(5) Diagnostic circuit
• This circuit constantly diagnoses system
malfunctions. When a malfunction is
detected, it lights up the SRS war

Page 2996 of 3000

TOYOTA SIENNA 2007 Service Repair Manual SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–19
RS
3. DEPLOYMENT CONDITION
When the vehicle collides and the shock is greater than
the specified value, the SRS is activated automatically.
T

Page 2997 of 3000

TOYOTA SIENNA 2007 Service Repair Manual RS–20SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
(b) The center airbag sensor assembly determines
whether or not ignition is necessary based on
signals from the side airbag sensor. If the

Page 2998 of 3000

TOYOTA SIENNA 2007 Service Repair Manual SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–21
RS
HINT:
*1: If the front seat side airbag assembly deploys,
the curtain shield airbag assembly will also deploy,
regardless of whether the s

Page 2999 of 3000

TOYOTA SIENNA 2007 Service Repair Manual RS–22SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
HOW TO PROCEED WITH
TROUBLESHOOTING
HINT:
*: Use the intelligent tester.
NEXT
(a) Confirm problem symptoms (See page IN-35).
NEXT
(a) Check

Page 3000 of 3000

TOYOTA SIENNA 2007 Service Repair Manual SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–23
RS
B
A
(a) Proceed to Diagnosis System (See page RS-27).
NEXT
(a) Proceed to DTC Check / Clear (See page RS-35).
Result:
B
A
(a) Proceed to Dia

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