2007 TOYOTA SIENNA sensor

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–37
AC
(c) Select the item below in the DATA LIST, and read the
display on the intelligent tester.
DATA LIST / AIR CONDITIONER:
OK:
The display is as specified in the normal condition
column.
Result
B
C
A
(a) Remove the rear evaporator temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
R-EVAP TEMP SEN
(Rear evaporator temperature
sensor)Rear evaporator temperature
sensor / min: -29.7
C (-21.46F),
max: 59.55
C (139.19F)Actual rear evaporator
temperature is displayed-
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE) B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE A/C AMPLIFIER
2INSPECT REAR EVAPORATOR TEMPERATURE SENSOR
E112577E07

AC–38AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
Standard resistance
NOTICE:
• Even slightly touching the sensor may change the
resistance value. Be sure to hold the connector of
the sensor.
• When measuring, the sensor temperature must be
the same as the rear evaporator temperature.
HINT:
As the temperature increases, the resistance decreases
(see the graph).
NG
OK
I040629E04
Tester Connection Condition Specified Condition
A26-1 - A26-2 -10
C (14F) 7.40 to 9.20 k
A26-1 - A26-2 -5C (23F) 5.65 to 7.00 k
A26-1 - A26-2 0C (32F) 4.35 to 5.40 k
A26-1 - A26-2 5C (41F) 3.40 to 4.20 k
A26-1 - A26-2 10C (50F) 2.68 to 3.30 k
A26-1 - A26-2 15C (59F) 2.10 to 2.60 k
A26-1 - A26-2 20C (68F) 1.66 to 2.10 k
A26-1 - A26-2 25C (77F) 1.32 to 1.66 k
A26-1 - A26-2 30C (86F) 1.05 to 1.35 k
REPLACE REAR EVAPORATOR
TEMPERATURE SENSOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–39
AC
(a) Disconnect the rear evaporator temperature sensor
connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (REAR EVAPORATOR TEMPERATURE SENSOR -
A/C AMPLIFIER)
E124472E10
E141047E07
Tester Connection Condition Specified Condition
A26-2 - A10-17 (TEC) Always Below 1
A26-1 - A10-13 (SG) Always Below 1
A10-17 (TEC) - Body
groundAlways 10 k or higher
A10-13 (SG) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–244AIR CONDITIONING – EVAPORATOR TEMPERATURE SENSOR
AC
EVAPORATOR TEMPERATURE
SENSOR
ON-VEHICLE INSPECTION
1. INSPECT A/C EVAPORATOR TEMPERATURE
SENSOR
(a) Remove the A/C evaporator temperature sensor (A/
C thermistor).
(b) Disconnect the connector from the A/C evaporator
temperature sensor (A/C thermistor).
(c) Measure the resistance according to the value(s) in
the table below.
Standard resistance
NOTICE:
• Even slightly touching the sensor may
change the resistance value. Be sure to hold
the connector of the sensor.
• When measuring, the sensor temperature
must be the same as the ambient
temperature.
HINT:
As the temperature increases, the resistance
decreases (see the graph).
If the resistance is not as specified, replace the A/C
evaporator temperature sensor (A/C thermistor).
E148014E01
Tester connection Condition Specified condition
1 - 2 -10
C (14F) 7.30 to 9.10 k
1 - 2 -5C (23F) 5.65 to 6.95 k
1 - 2 0C (32F) 4.40 to 5.35 k
1 - 2 5C (41F) 3.40 to 4.15 k
1 - 2 10C (50F) 2.70 to 3.25 k
1 - 2 15C (59F) 2.14 to 2.58 k
1 - 2 20C (68F) 1.71 to 2.05 k
1 - 2 25C (77F) 1.38 to 1.64 k
1 - 2 30C (86F) 1.11 to 1.32 k

AIR CONDITIONING – AIR CONDITIONING PRESSURE SENSORAC–247
AC
AIR CONDITIONING PRESSURE
SENSOR
ON-VEHICLE INSPECTION
1. INSPECT A/C PRESSURE SENSOR
(a) Install the manifold gauge set.
(b) Disconnect the connector from the A/C pressure
sensor.
(c) Connect the three 1.5 V dry cell batteries' positive
(+) lead to terminal 3 and the negative (-) lead to
terminal 1.
(d) Connect the voltmeter's positive (+) lead to terminal
2 and the negative (-) lead to terminal 1.
(e) Measure the voltage according to the value(s) in
the table below.
Standard voltage
If the result is not as specified, replace the A/C
pressure sensor.
E107326E13
Tester Connection Condition Specified Condition
2 - 1Refrigerant pressure:
0.39 to 3.187 MPa (57 to
463 psi)1.0 to 4.8 V

SUPPLEMENTAL RESTRAINT SYSTEM – AIRBAG SYSTEMRS–15
RS
SYSTEM DESCRIPTION
1. GENERAL
(a) In conjunction with impact absorbing structure for a
frontal collision, the SRS (Supplemental Restraint
System) driver airbag and front passenger airbag
were designed to supplement seat belts in the event
of a frontal collision in order to help reduce shock to
the head and chest. This system is a 3-sensor type
airbag system to detect the impact during a frontal
collision using the center airbag sensor assembly
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 impact absorbing structure for a
side collision, the front seat side airbag and curtain
shield airbag were designed to help reduce shock to
the driver, front passenger, and rear outer
passengers in the event of a side collision or
rollover.
(d) RSCA (Roll Sensing of Curtain Shield Airbags) is
used in order to deploy the curtain shield airbags
and the seat belt pretensioner for the driver and
front passenger, in the event that the vehicle rolls
over.
(e) The 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 the rear airbag sensors have been
installed at the bottom of the rear pillars
respectively.
(f) In this system, a front side collision is detected by
the side airbag sensors in order to deploy the front
seat side airbag and curtain shield airbag. A rear
side collision is detected by the rear airbag sensors
and the center airbag sensor assembly in order to
deploy the curtain shield airbag.
(g) The center airbag sensor assembly sends the
airbag deployment signal to the ECM through BEAN
(Body Electronics Area Network) and CAN
(Controller Area Network) to operate the fuel pump
control.
(h) The center airbag sensor assembly sends the
airbag deployment signal to the body ECU via a
discrete line to operate collision door lock release
control.

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.

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.