sensor TOYOTA SIENNA 2007 Service Repair Manual

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–9
AC
Rear A/C:
No air inlet controlAir inlet damper control servo motor circuitAC-98
Air inlet damper position sensor circuitAC-73
A/C amplifierAC-253
No air outlet controlAir outlet damper position sensor circuitAC-77
Air outlet control servo motor circuitAC-103
A/C amplifierAC-253
Engine idle up does not occur, or is continuousCompressor circuitAC-134
A/C amplifierAC-253
Displayed set temperature value does not match up
with operation of temperature control switchA/C amplifierAC-253
Brightness does not change when rheostat volume or
light control switch is turnedA/C amplifierAC-253
Unable to access the diagnosis mode A/C amplifierAC-253
DTC is not recorded. Set mode is cleared when IG
switch is turned offBack-up power source circuitAC-154
A/C amplifierAC-253
Symptom Suspected Area See page
Whole functions of the A/C system do not operateA/C amplifierAC-253
Rear air conditioning relay circuitAC-142
Rear air conditioning control panel circuitAC-139
Air Flow Control: No blower operationRear blower motor circuitAC-144
A/C amplifierAC-253
Air Flow Control: No blower controlRear blower motor circuitAC-144
A/C amplifierAC-253
Air Flow Control: Insufficient air outRear blower motor circuitAC-144
A/C amplifierAC-253
Temperature Control: Cool air does not come outVolume of refrigerantAC-168
Drive belt tension -
Refrigerant pressureAC-168
Compressor circuitAC-134
Pressure sensor circuitAC-51
Ambient temperature sensor circuitAC-28
Rear evaporator temperature sensor circuitAC-35
A/C amplifierAC-253
Temperature Control: Warm air does not come outRear air mix control servo motor circuitAC-113
Rear air mix damper position sensor circuitAC-85
Ambient temperature sensor circuitAC-28
Rear room temperature sensor circuitAC-39
Rear evaporator temperature sensor circuitAC-35
A/C amplifierAC-253
Heater radiatorAC-187
Temperature Control: Output air is warmer or cooler
than the set temperature or response is slowRear room temperature sensor circuitAC-39
Ambient temperature sensor circuitAC-28
Rear air mix damper position sensor circuitAC-85
Rear air mix control servo motor circuitAC-113
A/C amplifierAC-253
Temperature Control: No temperature control (only
Max. cool or Max. hot)Rear air mix control servo motor circuitAC-113
Rear air mix damper position sensor circuitAC-85
A/C amplifierAC-253 Symptom Suspected Area See page

AC–10AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
No air outlet controlRear air outlet damper position sensor circuitAC-89
Rear air outlet control servo motor circuitAC-118
A/C amplifierAC-253 Symptom Suspected Area See page

AC–40AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This sensor detects the rear cabin temperature that is used as the basis for temperature control and
sends a signal to the A/C amplifier.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position and turn the
intelligent tester main switch on.
DTC B1419/19 Rear Room Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1419/19 Rear room temperature sensor circuit (Open or short)• Rear A/C room temperature sensor
• Harness or connector between rear A/C room
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E20

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–41
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 A/C room temperature sensor.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NOTICE:
• Hold the sensor only by its connector. Touching
the sensor may change the resistance value.
• When measuring, the sensor temperature must be
the same as the rear cabin temperature.
HINT:
As the temperature increases, the resistance decreases
(see the graph).
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
REAR ROOM TEMP
(Rear room temperature sensor)Rear room temperature sensor /
min.: -6.5
C (20.3F), max.:
57.25
C (135.05F)Actual cabin 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 A/C ROOM TEMPERATURE SENSOR
E110805E10
Tester Connection Condition Specified Condition
R23-1 - R23-2 10
C (50F) 3.00 to 3.73 k
R23-1 - R23-2 15C (59F) 2.45 to 2.88 k
R23-1 - R23-2 20C (68F) 1.95 to 2.30 k
R23-1 - R23-2 25C (77F) 1.60 to 1.80 k
R23-1 - R23-2 30C (86F) 1.28 to 1.47 k
R23-1 - R23-2 35C (95F) 1.00 to 1.22 k
R23-1 - R23-2 40C (104F) 0.80 to 1.00 k
R23-1 - R23-2 45C (113F) 0.65 to 0.85 k
R23-1 - R23-2 50C (122F) 0.50 to 0.70 k
R23-1 - R23-2 55C (131F) 0.44 to 0.60 k
R23-1 - R23-2 60C (140F) 0.36 to 0.50 k

AC–42AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
NG
OK
(a) Disconnect the connector from the A/C amplifier.
(b) Disconnect the connector from the rear A/C room
temperature sensor.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OKREPLACE REAR A/C ROOM TEMPERATURE
SENSOR
3CHECK HARNESS AND CONNECTOR (REAR A/C ROOM TEMPERATURE SENSOR - A/C
AMPLIFIER)
E141047E08
E124472E11
Tester Connection Condition Specified Condition
A10-18 (TR) - R23-1 Always Below 1
A10-14 (SGND) - R23-2 Always Below 1
A10-18 (TR) - Body ground Always 10 k or higher
A10-14 (SGND) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–8AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
PROBLEM SYMPTOMS TABLE
Front A/C:
Symptom Suspected Area See page
Whole functions of the A/C system do not operateIG power source circuitAC-149
ACC power source circuitAC-152
A/C amplifierAC-253
Air Flow Control: No blower operationBlower motor circuitAC-127
A/C amplifierAC-253
Air Flow Control: No blower control Blower motor circuitAC-127
Air Flow Control: Insufficient air outBlower motor circuitAC-127
A/C amplifierAC-253
Temperature Control: Cool air does not come outVolume of refrigerantAC-168
Drive belt tension -
Refrigerant pressureAC-168
Compressor circuitAC-134
Pressure sensor circuitAC-51
Air mix control servo motor circuit (Passenger side)AC-93
Air mix control servo motor circuit (Driver side)AC-108
Air mix damper position sensor circuit (Passenger side)AC-69
Air mix damper position sensor circuit (Driver side)AC-81
Room temperature sensor circuitAC-25
Ambient temperature sensor circuitAC-28
A/C amplifierAC-253
Multiplex communication circuit (CAN)CA-7
Multiplex communication circuit (BEAN)MP-4
Temperature Control: Warm air does not come outAir mix control servo motor circuit (Passenger side)AC-93
Air mix control servo motor circuit (Driver side)AC-108
Air mix damper position sensor circuit (Passenger side)AC-69
Air mix damper position sensor circuit (Driver side)AC-81
Ambient temperature sensor circuitAC-28
Room temperature sensor circuitAC-25
Evaporator temperature sensor circuitAC-32
A/C amplifierAC-253
Heater radiatorAC-187
Multiplex communication circuit (CAN)CA-7
Multiplex communication circuit (BEAN)MP-4
Temperature Control: Output air is warmer or cooler
than the set temperature or response is slowRoom temperature sensor circuitAC-25
Ambient temperature sensor circuitAC-28
Solar sensor circuit (Passenger side)AC-42
Solar sensor circuit (Driver side)AC-64
Air mix damper position sensor circuit (Passenger side)AC-69
Air mix damper position sensor circuit (Driver side)AC-81
Air mix control servo motor circuit (Passenger side)AC-93
Air mix control servo motor circuit (Driver side)AC-108
A/C amplifierAC-253
Temperature Control: No temperature control (only
Max. cool or Max. warm)Air mix control servo motor circuit (Passenger side)AC-93
Air mix control servo motor circuit (Driver side)AC-108
Air mix damper position sensor circuit (Passenger side)
AC-69
Air mix damper position sensor circuit (Driver side)AC-81
A/C amplifierAC-253

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–9
AC
Rear A/C:
No air inlet controlAir inlet damper control servo motor circuitAC-98
Air inlet damper position sensor circuitAC-73
A/C amplifierAC-253
No air outlet controlAir outlet damper position sensor circuitAC-77
Air outlet control servo motor circuitAC-103
A/C amplifierAC-253
Engine idle up does not occur, or is continuousCompressor circuitAC-134
A/C amplifierAC-253
Displayed set temperature value does not match up
with operation of temperature control switchA/C amplifierAC-253
Brightness does not change when rheostat volume or
light control switch is turnedA/C amplifierAC-253
Unable to access the diagnosis mode A/C amplifierAC-253
DTC is not recorded. Set mode is cleared when IG
switch is turned offBack-up power source circuitAC-154
A/C amplifierAC-253
Symptom Suspected Area See page
Whole functions of the A/C system do not operateA/C amplifierAC-253
Rear air conditioning relay circuitAC-142
Rear air conditioning control panel circuitAC-139
Air Flow Control: No blower operationRear blower motor circuitAC-144
A/C amplifierAC-253
Air Flow Control: No blower controlRear blower motor circuitAC-144
A/C amplifierAC-253
Air Flow Control: Insufficient air outRear blower motor circuitAC-144
A/C amplifierAC-253
Temperature Control: Cool air does not come outVolume of refrigerantAC-168
Drive belt tension -
Refrigerant pressureAC-168
Compressor circuitAC-134
Pressure sensor circuitAC-51
Ambient temperature sensor circuitAC-28
Rear evaporator temperature sensor circuitAC-35
A/C amplifierAC-253
Temperature Control: Warm air does not come outRear air mix control servo motor circuitAC-113
Rear air mix damper position sensor circuitAC-85
Ambient temperature sensor circuitAC-28
Rear room temperature sensor circuitAC-39
Rear evaporator temperature sensor circuitAC-35
A/C amplifierAC-253
Heater radiatorAC-187
Temperature Control: Output air is warmer or cooler
than the set temperature or response is slowRear room temperature sensor circuitAC-39
Ambient temperature sensor circuitAC-28
Rear air mix damper position sensor circuitAC-85
Rear air mix control servo motor circuitAC-113
A/C amplifierAC-253
Temperature Control: No temperature control (only
Max. cool or Max. hot)Rear air mix control servo motor circuitAC-113
Rear air mix damper position sensor circuitAC-85
A/C amplifierAC-253 Symptom Suspected Area See page

AC–10AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
No air outlet controlRear air outlet damper position sensor circuitAC-89
Rear air outlet control servo motor circuitAC-118
A/C amplifierAC-253 Symptom Suspected Area See page

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–21
AC
DIAGNOSTIC TROUBLE CODE CHART
If a trouble code is displayed during the DTCs check (sensor
check), check the circuit listed for the code in the table below
(Proceed to the page given for that circuit).
AIR CONDITIONING SYSTEM
DTC Code Detection Item Trouble Area Memory See page
B1411/11
*1Room Temperature
Sensor Circuit1. A/C Room temperature
sensor
2. A/C amplifier (A/C
control assembly)
3. Harness or connector
between A/C room
temperature sensor and A/
C amplifier (A/C control
assembly)Memorized
(8.5 min. or more)AC-25
B1412/12 Ambient Temperature
Sensor Circuit1. Ambient temperature
sensor
2. Harness or connector
between ambient
temperature sensor and A/
C amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(8.5 min. or more)AC-28
B1413/13 Evaporator Temperature
Sensor Circuit1. Evaporator temperature
sensor
2. Harness or connector
between evaporator
temperature sensor and A/
C amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(8.5 min. or more)AC-32
B1417/17 Rear Evaporator
Temperature Sensor
Circuit1. Rear evaporator
temperature sensor
2. Harness or connector
between rear evaporator
temperature sensor and A/
C amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(8.5 min. or more)AC-35
B1419/19
*1Rear Room Temperature
Sensor Circuit1. Rear A/C room
temperature sensor
2. Harness or connector
between rear A/C room
temperature sensor and A/
C amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(8.5 min. or more)AC-39
B1421/21
*2Solar Sensor Circuit
(Passenger Side)1. Solar sensor
2. Harness or connector
between solar sensor and
A/C amplifier (A/C control
assembly)
3. Harness or connector
between solar sensor and
body ECU
4. A/C amplifier (A/C
control assembly)
5. Body ECUMemorized*3
(8.5 min. or more)
-*4
AC-42

AC–22AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
B1422/22 Compressor Lock Sensor
Circuit1. A/C compressor (A/C
lock sensor)
2. Compressor drive belt
3. Harness or connector
between compressor and
magnetic clutch (A/C lock
sensor)
4. A/C amplifier
5. CAN communication
system
6. Multiplex
communication system
(BEAN)-AC-47
B1423/23 Pressure Sensor Circuit 1. Pressure sensor
2. Harness or connector
between pressure sensor
and A/C amplifier
3. A/C amplifier
4. Expansion valve
(blocked, stuck)
5. Condenser (blocked,
deterioration of cooling
capacity due to dirt)
6. Cooler dryer (moisture
in the refrigerant cycle
cannot be absorbed)
7. Cooling fan system
(condenser cannot be
cooled down)
8. A/C system (leaks,
blocked)-AC-51
B1424/24
*2Solar Sensor Circuit
(Driver Side)1. Solar sensor
2. Harness or connector
between solar sensor and
A/C amplifier (A/C control
assembly)
3. Harness or connector
between solar sensor and
body ECU
4. A/C amplifier (A/C
control assembly)
5. Body ECUMemorized*3
(8.5 min. or more)
-AC-64
B1431/31 Air Mix Damper Position
Sensor Circuit (Passenger
Side)1. Air mix damper position
sensor
2. A/C amplifier (A/C
control assembly)
3. Harness or connector
between air mix damper
position sensor and A/C
amplifier (A/C control
assembly)Memorized
(1 min. or more)AC-69
B1432/32 Air Inlet Damper Position
Sensor Circuit1. Air inlet damper position
sensor (Air inlet control
servo motor)
2. A/C amplifier (A/C
control assembly)
3. Harness or connector
between air inlet damper
position sensor and A/C
amplifier (A/C control
assembly)Memorized
(1 min. or more)AC-73 DTC Code Detection Item Trouble Area Memory See page