2006 TOYOTA RAV4 sensor

AIR CONDITIONING – AMBIENT TEMPERATURE SENSOR (for Automatic Air Conditioning
System)AC–233
AC
INSTALLATION
1. INSTALL AMBIENT TEMPERATURE SENSOR
(a) Connect the connector, and then push in the sensor.
2. INSTALL FRONT BUMPER COVER
(a) Install the front bumper cover (see page ET-10).
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. CHECK SRS WARNING LIGHT
(a) Check SRS warning light (see page RS-37).

AIR CONDITIONING – SOLAR SENSOR (for Automatic Air Conditioning System)AC–237
AC
INSTALLATION
1. INSTALL SOLAR SENSOR
(a) Connect the connector, and then push in the solar
sensor.
2. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
3. CHECK SRS WARNING LIGHT
(a) Check the SRS warning light (see page RS-37).

SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–25
RS
SYSTEM DESCRIPTION
1. GENERAL
(a) In conjunction with an impact absorbing structure for
a frontal collision, the SRS (Supplemental Restraint
System) driver airbag, front passenger airbag and
driver side knee airbag were designed to
supplement seat belts in the event of a frontal
collision in order to help reduce shock to the head,
chest and knee of the driver and front passenger.
This system is a 3-sensor type airbag system to
detect the impact during a frontal collision using the
center airbag sensor and front airbag sensors. It
also operates the airbag system and seat belt
pretensioner.
(b) In order to detect the extent of the collision during
the initial stages of the collision in further detail, the
front airbag sensors have been changed from
mechanical type to electrical type deceleration
sensors. Accordingly, the deployment of the driver
airbag and front passenger airbag is controlled in
two stages according to the severity of the impact.
(c) In conjunction with an impact absorbing structure for
a side collision, the side airbag and curtain shield
airbag were designed to help reduce shock to the
driver and front passenger in the event of a side
collision.
(d) A curtain shield airbag that helps reduce shock to
the front and rear seat occupants with a single
curtain shield airbag has been adopted. In
conjunction with this system, the side airbag
sensors have been installed at the bottom of the
center pillars and rear airbag sensors have been
installed at the bottom of the rear pillars.
(e) In this system, a front side collision is detected by
the side airbag sensor in order to simultaneously
deploy the side airbag. A rear side collision is
detected by the rear airbag sensor and the center
airbag sensor in order to deploy the side airbag and
curtain shield airbag.
(f) The center airbag sensor sends the airbag
deployment signal to the ECM through the CAN
(Controller Area Network) to operate the fuel pump
control.
2. CONSTRUCTION AND OPERATION
(a) FRONT AIRBAG SENSOR
(1) The front airbag sensors are installed on the
right and left radiator supports.
(2) The front airbag sensor consists of the
deceleration sensor.

RS–26SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
(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.
(2) The side airbag sensor consists of the
deceleration sensor and ignition control circuit.
(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.
(2) The rear airbag sensor consists of the
deceleration sensor and ignition control circuit.
(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
(1) General
• The center airbag sensor is installed on the
center floor under the console box.
• The center airbag sensor consists of the
deceleration sensor, safing sensor, electronic
safing sensor, ignition control circuit and
diagnostic circuit.
• The center airbag sensor receives signals
from the deceleration sensor and safing
sensor built into the center airbag sensor and
front airbag sensor. Then the center airbag
sensor determines whether or not the driver
airbag, front passenger airbag, driver side
knee airbag and seat belt pretensioner should
be activated, and diagnoses system
malfunctions.
• The center airbag sensor causes the side
airbag and the curtain shield airbag to deploy
when receiving signals from the side and rear
airbag sensor.

SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–27
RS
• The center airbag sensor receives signals
from the deceleration sensor and the
electronic safing sensor built into the center
airbag sensor and the rear airbag sensor, and
determines whether or not the side airbag
and curtain shield airbag should be activated,
and diagnoses system malfunctions.
• The center airbag sensor sends the airbag
deployment signal to ECM through the CAN
to operate the fuel pump control.
(2) Deceleration sensor and ignition control circuit
• The deceleration sensor is built into the
center airbag sensor.
• The ignition control circuit performs
calculations based on the signal output from
the deceleration sensors of the center airbag
sensor and front airbag sensor. If the
calculated values are greater than the
specified values, it activates the deployment
operation.
(3) Safing sensor
The safing sensor is built into the center airbag
sensor. During a frontal collision, the sensor
turns on and outputs an ON signal to the center
airbag sensor if a deceleration rate greater than
the specified value is applied to the safing
sensor.
(4) Electronic safing sensor
The electronic safing sensor is built into the
center airbag sensor. During a side collision, the
sensor turns on and outputs an ON signal to the
center airbag sensor if a deceleration rate
greater than the specified value is applied to the
electronic safing sensor.
(5) Back-up power source
The back-up power source consists of a power
supply capacitor and a DC-DC converter. When
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.
(6) Diagnostic circuit
This circuit constantly diagnoses system
malfunctions. When a malfunction is detected, it
lights up the SRS warning light on the telltale
light to inform the driver.
(7) Memory circuit
When a malfunction is detected in the diagnostic
circuit, it is coded and stored in the memory
circuit.

RS–28SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
(e) SRS WARNING LIGHT
(1) The SRS warning light is located on the telltale
light. It comes on to inform the driver of system
trouble when a malfunction is detected in the
self-diagnosis of the center airbag sensor. Under
normal operating conditions when the ignition
switch is turned on, it comes on for
approximately 6 seconds and then goes off.
3. DEPLOYMENT CONDITION
When the vehicle collides and the shock is greater than
the specified value, the SRS is activated automatically.
The center airbag sensor includes the safing sensor and
deceleration sensor. The safing sensor was designed to
be turned on at a smaller deceleration rate than the
deceleration sensor.
(a) The center airbag sensor determines whether or not
deployment is necessary based on signals from the
deceleration sensor and the front airbag sensor*. If
the safing sensor turns on simultaneously, current
flows to the squibs to deploy the SRS as shown in
the illustration below.
C109526E06

SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–29
RS
HINT:
* : In case of a frontal collision, the ignition signal
could be output with the deceleration sensor ON
signal even without a signal from the front airbag
sensor.
(b) The center airbag sensor determines whether or not
deployment is necessary based on signals from the
side airbag sensor. If the safing sensor turns on
simultaneously, current flows to the squib to deploy
the SRS as shown in the illustration below.
(c) The center airbag sensor determines whether or not
deployment is necessary based on signals from the
rear airbag sensor. If the safing sensor turns on
simultaneously, current flows to the squib to deploy
the SRS as shown in the illustration below*.
C109527E06
C109528E06

RS–30SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEM
RS
HINT:
*: If the side airbag deploys, the curtain shield
airbag will also deploy, regardless of whether the
signal is output from the rear airbag sensor.
(d) The center airbag sensor contains a roll rate sensor
and roll rate sensor (that determine the inclination
angle the vehicle) and a lateral deceleration sensor
(that determine the lateral force that is applied to the
vehicle). These sensors detect the vehicle's roll
angle (a), rotational speed (b), and lateral
acceleration speed (c). Based on the information
obtained from sensors, the airbag sensor makes an
overall judgment of the vehicle's roll angle (a),
rotational speed (b), and lateral acceleration speed
(c). If the airbag sensor determines that the vehicle
has rolled over due to cause other than the side
collision, it deploys the right and left curtain shield
airbag and the front right and left seat belt
pretensioner.