TOYOTA SIENNA 2007 Service Repair Manual

AC–78AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This sensor detects the position of the air outlet control servo motor and sends the appropriate signals to
the A/C amplifier. The position sensor is built in the air outlet control servo motor. The position sensor's
resistance changes as the air outlet control servo motor arm moves.
It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resistor, and then to the A/
C amplifier. The A/C amplifier determines the arm position based on the input voltage from the position
sensor.
DTC B1433/33 Air Outlet Damper Position Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1433/33Open or short in power source circuit in air outlet
damper position sensor circuit.• Air outlet control servo motor (air outlet damper
position sensor)
• Harness or connector between air outlet control
servo motor (air outlet damper position sensor) and
A/C amplifier
• A/C amplifier
E109300E01

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–79
AC
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.
(c) Select the items below in the DATA LIST, and read the
displays on the intelligent tester.
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition
column.
Result
B
1READ VALUE OF INTELLIGENT TESTER
I036321E27
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
A/O DAMP POSAir outlet damper position / min.: -
14%, max.: 113.5%Damper is at "FACE": 0%
Damper is at "FACE/FOOT":
33.5%
Damper is at "FOOT": 53.5%
Damper is at "FACE/DEF": 73.5%
Damper is at "DEF": 100%Open in the circuit: 50.0%
A/O DAMP TARGAir outlet damper target position /
min.: -14%, max.: 113.5%
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE

AC–80AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
C
A
(a) Remove the air outlet control servo motor.
(b) Disconnect the connector from the air outlet control
servo motor.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(d) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(e) As the air outlet control servo motor moves from the
FACE side to the DEF side, the resistance decreases
gradually without interruption.
NG
OKREPLACE A/C AMPLIFIER
2INSPECT AIR OUTLET CONTROL SERVO MOTOR
E147338E01
Tester Connection Condition Specified Condition
A19-2 - A19-1 Always 4.2 to 7.8 k
Tester Connection Condition Specified Condition
A19-3 - A19-1 DEF position 0.8 to 1.6 k
A19-3 - A19-1 FACE position 3.4 to 6.2 k
E108925E05
REPLACE AIR OUTLET CONTROL SERVO
MOTOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–81
AC
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (AIR OUTLET CONTROL SERVO MOTOR - A/C
AMPLIFIER)
E145121E05
E143742E37
Tester Connection Condition Specified Condition
A9-29 (TPO) - A19-3 Always Below 1
A9-21 (SG-1) - A19-1 Always Below 1
A9-30 (S5-1) - A19-2 Always Below 1
A9-29 (TPO) - Body
groundAlways 10 k or higher
A9-21 (SG-1) - Body
groundAlways 10 k
or higher
A9-30 (S5-1) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–82AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This sensor detects the position of the air mix control servo motor (air outlet damper) and sends the
appropriate signals to the A/C amplifier. The position sensor is built in the air mix control servo motor. The
position sensor resistance changes as the air mix control servo motor arm moves.
It outputs voltage (5 V) that is input to terminal 1 and terminal 3 via the variable resistor, and then to the A/
C amplifier. The A/C amplifier determines the arm position based on the input voltage from the position
sensor.
DTC B1436/36Air Mix Damper Position Sensor Circuit (Driver
Side)
DTC No. DTC Detection Condition Trouble Area
B1436/36Open or short in power source circuit in air mix damper
position sensor circuit.• Air mix control servo motor (air mix damper position
sensor)
• Harness or connector between air mix control servo
motor and A/C amplifier
• A/C amplifier
E109300E01

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–83
AC
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.
(c) Select the items 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
1READ VALUE OF INTELLIGENT TESTER
I036321E24
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
A/M DAMP POS-DAir mix damper position (Driver
side) / min.: -14%, max.: 113.5%
Damper is at "MAX. COOL": -5%
Damper is at "MAX. HOT": 105%-
A/M DAMP TARG-DAir mix damper target position
(Driver side) / min.: -14%, max.:
11 3 . 5 %
Result Proceed to
NGA
OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE

AC–84AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
C
A
(a) Remove the air mix control servo motor.
(b) Disconnect the connector from the air mix control servo
motor.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(d) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(e) As the air mix control servo motor moves from the COOL
side to the HOT side, the resistance decreases gradually
without interruption.
NG
OKREPLACE A/C AMPLIFIER
2INSPECT AIR MIX CONTROL SERVO MOTOR
E109269E09
Tester Connection Condition Specified Condition
A17-1 - A17-2 Always 4.2 to 7.8 k
Tester Connection Condition Specified Condition
A17-3 - A17-2 MAX. COOL position 3.4 to 6.2 k
A17-3 - A17-2 MAX. HOT position 0.8 to 1.6 k
E108925E08
REPLACE AIR MIX CONTROL SERVO
MOTOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–85
AC
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
3CHECK HARNESS AND CONNECTOR (AIR MIX CONTROL SERVO MOTOR - A/C
AMPLIFIER)
E145121E06
E143742E38
Tester Connection Condition Specified Condition
A9-26 (TPD) - A17-3 Always Below 1
A9-21 (SG-1) - A17-2 Always Below 1
A9-30 (S5-1) - A17-1 Always Below 1
A9-26 (TPD) - Body
groundAlways 10 k or higher
A9-21 (SG-1) - Body
groundAlways 10 k
or higher
A9-30 (S5-1) - Body
groundAlways 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE A/C AMPLIFIER

AC–86AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This sensor detects the position of the rear air mix control servo motor (water valve servo motor) and
sends the appropriate signals to the A/C amplifier. The position sensor is built in the rear air mix control
servo motor (water valve servo motor).
The position sensor's resistance changes as the rear air mix control servo motor valve moves.
It outputs voltage (5 V) that is input to terminal 2 and terminal 3 via the variable resistor, and then to the A/
C amplifier.
The A/C amplifier determines the valve position based on the input voltage from the position sensor.
DTC B1437/37 Rear Air Mix Damper Position Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1437/37Open or short in power source circuit in rear air mix
damper position sensor circuit.• Rear air mix control servo motor (water valve servo
motor)
• Harness and connector between rear air mix
control servo motor (water valve servo motor) and
A/C amplifier
• A/C amplifier
E109300E26

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–87
AC
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.
(c) Select the items 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
1READ VALUE OF INTELLIGENT TESTER
I036321E25
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
A/M DAMP POS-RAir mix damper position (Rear) /
min.: -14%, max.: 113.5%
Damper is at "MAX. COOL": 0%
Damper is at "MAX. HOT": 86.5%-
A/M DAMP TARG-RAir mix damper target position
(Rear) / min.: -14%, max.: 113.5%
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