wiring TOYOTA SIENNA 2007 Service Repair Manual

AC–164AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Manual Air Conditioning System)
AC
TERMINALS OF ECU
1. A/C AMPLIFIER
HINT:
Check from the rear of the connector while it is
connected to the A/C amplifier.
E145189E02
Terminal No.
(Symbols)Wiring Color Description Condition Specified Condition
A9-1 (S5) - A9-26 (SG) BR-R - LG-RPower supply for air mix
control damper position
sensorIgnition switch: ON 4.5 to 5.5 V
A9-3 (TE) - A9-7 (SG-4) G-B - YA/C evaporator
temperature sensor signalIgnition switch: ON
Evaporator temperature:
0
C (32F)2.0 to 2.4 V
A9-3 (TE) - A9-7 (SG-4) G-B - YA/C evaporator
temperature sensor signalIgnition switch: ON
Evaporator temperature:
15
C (59F)1.4 to 1.8 V
A9-4 (MPX+) - Body
groundV - Body groundMultiplex communication
systemMultiplex communication
circuitPulse generation
A9-5 (MPX-) - Body
groundR-L - Body groundMultiplex communication
systemMultiplex communication
circuitPulse generation
A9-6 (GND) - Body ground W-B - Body groundGround for main power
supplyAlways Below 1 V
A9-7 (SG-4) - Body
groundY - Body groundGround for A/C evaporator
temperature sensorAlways Below 1 V
A9-8 (FTIN) - A9-6 (GND) B-O - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(FOOT): OFF4.5 to 5.5 V
A9-8 (FTIN) - A9-6 (GND) B-O - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(FOOT): ONBelow 1 V
A9-9 (BLIN) - A9-6 (GND) W - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(B/L): OFF4.5 to 5.5 V
A9-9 (BLIN) - A9-6 (GND) W - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(B/L): ONBelow 1 V
A9-10 (FCIN) - A9-6
(GND)BR-B - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(FACE): OFF4.5 to 5.5 V
A9-10 (FCIN) - A9-6
(GND)BR-B - W-BMode control switch
operation signalIgnition switch: ON
Rear mode control switch
(FACE): ONBelow 1 V
A9-11 (RDSW) - A9-6
(GND)Y- G - W - BRear defogger operation
signalIgnition switch: ON
REAR DEF switch: OFF4.5 to 5.5 V
A9-11 (RDSW) - A9-6
(GND)Y- G - W - BRear defogger operation
signalIgnition switch: ON
REAR DEF switch: ONBelow 1 V

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Manual Air Conditioning System)AC–165
AC
A9-12 (SOL+) - A9-6
(GND)W-L - W-BA/C compressor operation
signalEngine is runningA/C
switch: ON
Front blower control dial:
LOPulse generation
(See waveform 1)
A9-13 (AOD) - A9-6
(GND)G-O - W-BAir outlet control servo
motor operation signalIgnition switch: ON
Front mode control dial:
FOOTBelow 1 V
A9-13 (AOD) - A9-6
(GND)G-O - W-BAir outlet control servo
motor operation signalIgnition switch: ON
Front mode control dial:
DEF11 to 14 V
A9-14 (AOF) - A9-6 (GND) L-O - W-BAir outlet control servo
motor operation signalIgnition switch: ON
Front mode control dial:
DEFBelow 1 V
A9-14 (AOF) - A9-6 (GND) L-O - W-BAir outlet control servo
motor operation signalIgnition switch: ON
Front mode control dial:
FOOT11 to 14 V
A9-15 (FOOT) - A9-6
(GND)G-Y - W-BRear air outlet control
servo motor operation
signalIgnition switch: ON
Rear mode control switch
(FOOT): OFFBelow 1 V
A9-15 (FOOT) - A9-6
(GND)G-Y - W-BRear air outlet control
servo motor operation
signalIgnition switch: ON
Rear mode control switch
(FOOT): ON11 to 14 V
A9-16 (FACE) - A9-6
(GND)LG-B - W-BRear air outlet control
servo motor operation
signalIgnition switch: ON
Rear mode control switch
(FACE): OFFBelow 1 V
A9-16 (FACE) - A9-6
(GND)LG-B - W-BRear air outlet control
servo motor operation
signalIgnition switch: ON
Rear mode control switch
(FACE): ON11 t o 1 4 V
A9-17 (+B) - A9-6 (GND) W-L - W-B Power source (Battery) Always 11 to 14 V
A9-18 (IG) - A9-6 (GND) R-Y - W-B Power source (IG) Ignition switch: OFF Below 1 V
A9-18 (IG) - A9-6 (GND) R-Y - W-B Power source (IG) Ignition switch: ON 11 to 14 V
A9-19 (MHH) - A9-6
(GND)V- Y - W- BRear air mix control servo
motor operation signalIgnition switch: ON
Rear temperature control
dial: MAX COLDBelow 1 V
A9-19 (MHH) - A9-6
(GND)V- Y - W- BRear air mix control servo
motor operation signalIgnition switch: ON
Rear temperature control
dial: MAX HOT11 t o 1 4 V
A9-20 (MCH) - A9-6
(GND)GR-L - W-BRear air mix control servo
motor operation signalIgnition switch: ON
Rear temperature control
dial: MAX HOTBelow 1 V
A9-20 (MCH) - A9-6
(GND)GR-L - W-BRear air mix control servo
motor operation signalIgnition switch: ON
Rear temperature control
dial: MAX COLD11 to 14 V
A9-21 (S5) - A9-6 (GND) B-W - W-BPower supply for mode
control switchIgnition switch: ON 4.5 to 5.5 V
A9-22 (S5-1) - A9-27 (SG-
1)P-L - GR-LPower supply for air outlet
control damper position
sensorIgnition switch: ON 4.5 to 5.5 V
A9-23 (S5) - A9-6 (GND) P-L - W-BPower supply for rear air
outlet control damper
position sensorIgnition switch: ON 4.5 to 5.5 V
A9-24 (TSET) - A9-6
(GND)R-G - W-BRear temperature control
dial operation signalIgnition switch: ON
Rear temperature control
dial: ON0 to 5 V
A9-25 (BSET) - A9-6
(GND)GR-G - W-BRear blower control dial
operation signalIgnition switch: ON
Rear blower control dial:
ON0 to 5 V
A9-26 (SG) - Body ground LG-R - Body groundGround for air mix control
damper position sensorAlways Below 1 V Terminal No.
(Symbols)Wiring Color Description Condition Specified Condition

AC–166AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Manual Air Conditioning System)
AC
A9-27 (SG-1) - Body
groundGR-L - Body groundGround for air outlet
control damper position
sensorAlways Below 1 V
A9-28 (SG) - Body ground V-W - Body groundGround for rear A/C
control assemblyAlways Below 1 V
A9-29 (SG) - Body ground W-R - Body groundGround for rear air outlet
control damper position
sensorAlways Below 1 V
A9-30 (SG-6) - Body
groundW-G - Body groundGround for A/C lock
sensor, A/C pressure
sensor and A/C ambient
temperature sensorAlways Below 1 V
A9-35 (THOT) - A9-6
(GND)L-B - W-BAir mix control servo motor
operation signalIgnition switch: ON
Front temperature control
dial: MAX. COLDBelow 1 V
A9-35 (THOT) - A9-6
(GND)L-B - W-BAir mix control servo motor
operation signalIgnition switch: ON
Front temperature control
dial: MAX. HOT11 to 14 V
A9-36 (TCOL) - A9-6
(GND)P-G - W-BAir mix control servo motor
operation signalIgnition switch: ON
Front temperature control
dial: MAX. HOTBelow 1 V
A9-36 (TCOL) - A9-6
(GND)P-G - W-BAir mix control servo motor
operation signalIgnition switch: ON
Front temperature control
dial: MAX. COLD11 to 14 V
A9-38 (A/CB) - A9-6
(GND)B - W-B Power source (Battery)Ignition switch: ON
Front blower control dial:
OFFBelow 1 V
A9-38 (A/CB) - A9-6
(GND)B - W-B Power source (Battery)Ignition switch: ON
Front blower control dial:
ON11 to 14 V
A9-40 (ACC) - A9-6 (GND) P - W-B Power source (ACC) Ignition switch: OFF Below 1 V
A9-40 (ACC) - A9-6 (GND) P - W-B Power source (ACC) Ignition switch: ACC 11 to 14 V
A10-2 (LOCK) - A9-30
(SG-6)L - W-G A/C lock sensor signalEngine is running
Front blower control dial:
LO
A/C switch: ONPulse generation
(See waveform 2)
A10-6 (BLWC) - A9-6
(GND)L-W - W-BRear blower motor
operation signalIgnition switch: ON
Rear blower control dial:
ON1.7 to 2.0 V
A10-7 (VMC) - A9-6
(GND)P-B - W-BRear blower motor
operation signalIgnition switch: ON
Rear blower control dial:
ON0 to 9 V
A10-9 (TAM) - A9-30 (SG-
6)
B-R - W-GA/C ambient temperature
sensor signalIgnition switch: ON
Ambient temperature:
25C (77F)1.35 to 1.75 V
A10-9 (TAM) - A9-30 (SG-
6)B-R - W-GA/C ambient temperature
sensor signalIgnition switch: ON
Ambient temperature:
40
C (104F)0.85 to 1.25 V
A10-10 (PRE) - A9-30
(SG-6)V - W-GA/C pressure sensor
signalStart engine
Operate A/C system
Refrigerant pressure:
Abnormal pressure (more
than 3140 kPa (32.0 kgf/
cm
2, 455 psi))4.74 V or higher
A10-10 (PRE) - A9-30
(SG-6)V - W-GA/C pressure sensor
signalStart engine
Operate A/C system
Refrigerant pressure:
Abnormal pressure (less
than 196 kPa (2.0 kgf/cm
2,
28 psi))Below 0.76 V Terminal No.
(Symbols)Wiring Color Description Condition Specified Condition

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Manual Air Conditioning System)AC–167
AC
(a) Waveform 1:
A10-10 (PRE) - A9-30
(SG-6)V - W-GA/C pressure sensor
signalStart engine
Operate A/C system
Refrigerant pressure:
Normal pressure (less
than 3140 kPa (32.0 kgf/
cm
2, 455 psi) and more
than 196 kPa (2.0 kgf/cm2,
28 psi))0.76 to 4.74 V
A10-11 (TPO) - A9-27
(SG-1)LG - GR-LAir outlet control damper
position sensor signalIgnition switch: ON
Front mode control dial:
FOOT
DEF1.0 to 4.0 V
A10-12 (TP) - A9-26 (SG) L-R - LG-RAir mix control damper
position sensor signalIgnition switch: ON
Front temperature control
dial: MAX. HOT
MAX.
COLD1.0 to 4.0 V
A10-19 (REC) - A9-6
(GND)GR-R - W-BAir inlet control servo
motor operation signalIgnition switch: ON
R/F switch: FRESHBelow 1 V
A10-19 (REC) - A9-6
(GND)GR-R - W-BAir inlet control servo
motor operation signalIgnition switch: ON
R/F switch:
RECIRCULATION11 to 14 V
A10-20 (FRS) - A9-6
(GND)W-L - W-BAir inlet control servo
motor operation signalIgnition switch: ON
R/F switch:
RECIRCULATIONBelow 1 V
A10-20 (FRS) - A9-6
(GND)W-L - W-BAir inlet control servo
motor operation signalIgnition switch: ON
R/F switch: FRESH11 to 14 V
A10-21 (HRC) - A9-6
(GND)R-G - W-BRear blower motor
operation signalIgnition switch: ON
Rear blower control dial:
OFF11 to 14 V
A10-21 (HRC) - A9-6
(GND)R-G - W-BRear blower motor
operation signalIgnition switch: ON
Rear blower control dial:
ONBelow 1 V
A10-22 (MGC) - A9-6
(GND)R-L - W-BA/C compressor magnetic
clutch relay operation
signalIgnition switch: ON
A/C switch: OFF11 t o 1 4 V
A10-22 (MGC) - A9-6
(GND)R-L - W-BA/C compressor magnetic
clutch relay operation
signalIgnition switch: ON
A/C switch: ONBelow 1 V
A10-23 (TPH) - A9-29
(SG)B - W-RRear air mix control
damper position sensor
signalIgnition switch: ON
Rear temperature control
dial: MAX. HOT
MAX.
COLD1.0 to 4.0 V
A10-24 (TPM) - A9-29
(SG)G - W-RRear air outlet control
damper position sensor
signalIgnition switch: ON
Rear mode control switch:
FOOT
FACE1.0 to 4.0 V Terminal No.
(Symbols)Wiring Color Description Condition Specified Condition
E106664E04
Item Contents
Terminal No.
(Symbols)A9-12 (SOL+) - A9-6 (GND)
Tool Setting 5 V/DIV., 500
s/DIV.
Vehicle ConditionEngine is running
A/C switch: ON
Front blower control dial: LO

AC–18AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the intelligent tester to read the Data List allows
the values or states of switches, sensors, actuators and
other items to be read without removing any parts. This
non-intrusive inspection can be very useful because
intermittent conditions or signals may be discovered
before parts or wiring is disturbed. Reading the Data List
information early in troubleshooting is one way to save
diagnostic time.
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) From the display on the tester, read the "DATA
LIST".
AIR CONDITIONER / DATA LIST
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
ROOM TEMPRoom temperature sensor / min.:
-6.5
C (20.3F), max.: 57.25C
(135.05
F)Actual cabin temperature -
AMBI TEMP SENSAmbient temperature sensor /
min.: -23.3
C (-9.94F), max.:
65..95C (150.71F)Actual ambient temperature -
AMBI TEMPAdjusted ambient temperature /
min.: -30.8
C (-23.44F), max.:
50.8
C (123.44F)--
EVAP TEMPEvaporator temperature sensor /
min.: -29.7
C (-21.46F), max.:
59.55
C (139.19F)Actual evaporator temperature -
SOLAR SENS-DSolar sensor (D side) / min.: 0,
max.: 255Changes depending on
brightness (D side)-
SOLAR SENS-PSolar sensor (P side) / min.: 0,
max.: 255Changes depending on
brightness (P side)-
COOLANT TEMPEngine coolant temperature /
min.: 1.3
C (34.34F), max.:
90.55C (194.99F)Actual engine coolant
temperature-
SET TEMP-DSet temperature (D side) / min.: 0,
max. 255Actual set temperature (D side) -
SET TEMP-PSet temperature (P side) / min.: 0,
max. 255Actual set temperature (P side) -
ESTIMATE TEMP-DEstimated temperature (D side) /
min.: -358.4
C (-613.12F), max.:
358.4
C (677.12F)--
ESTIMATE TEMP-PEstimated temperature (P side) /
min.: -358.4
C (-613.12F), max.:
358.4
C (677.12F)--
A/M DAMP POS-DAir mix damper position (D side) /
min.: -14%, max.: 113.5%Changes depending on the set
temperature (D side)-
A/M DAMP POS-PAir mix damper position (P side) /
min.: -14%, max.: 113.5%Changes depending on the set
temperature (P side)-
A/I DAMP POSAir inlet damper position / min.: -
14%, max.: 113.5%Changes depending on air inlet
damper position-
A/O DAMP POSAir outlet damper position / min.: -
14%, max.: 113.5%Changes depending on air outlet
damper position-
A/M DAMP TARG-DAir mix damper target position (D
side) / min.: -14%, max.: 113.5%Changes depending on the set
temperature (D side)-
A/M DAMP TARG-PAir mix damper target position (P
side) / min.: -14%, max.: 113.5%Changes depending on the set
temperature (P side)-

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–19
AC
HINT:
*1: It differs depending on the user setting.
2. ACTIVE TEST
HINT:
Using the intelligent tester to perform Active Tests allows
relays, VSVs, actuators and other items to be operated
without removing any parts. This non-intrusive functional
inspection can be very useful because intermittent
operation may be discovered before parts or wiring is
disturbed. Performing Active Tests early in
troubleshooting is one way to save diagnostic time. Data
List information can be displayed while performing Active
Tests.
(a) Connect the intelligent tester to the DLC3.
A/I DAMP TARGAir inlet damper target position /
min.: -14%, max.: 113.5%Changes depending on air inlet
damper position-
A/O DAMP TARGAir outlet damper target position /
min.: -14%, max.: 113.5%Changes depending on air outlet
damper position-
BLOWER LEVELBlower motor speed level / min.:
Level 0, max.: Level 31Changes depending on blower
level-
REAR ROOM TEMPRoom temperature sensor (Rear)
/ min.: -6.5
C (20.3F), max.:
57.25C (135.05F)Actual cabin temperature (Rear) -
R-EVAP TEMP SENRr. EVAP temperature sensor
(Rear) / min.: -29.7
C (-21.46F),
max.: 59.55
C (139.19F)Actual evaporator temperature
(Rear)-
SET TEMP REARSet temperature (Rear) / min.: 0,
max. 255Actual set temperature -
ESTIMATE TEMP-REstimated temperature (Rear) /
min.: -358.4
C (-613.12F), max.:
358.4
C (677.12F)--
A/M DAMP POS-RAir mix damper position (Rear) /
min.: -14%, max.: 113.5%Changes depending on the set
temperature (Rear)-
A/O DAMP POS-RAir outlet mode damper position
(Rear) / min.: -14%, max.: 113.5%Changes depending on air outlet
damper position (Rear)-
A/M DAMP TARG-RAir mix damper target position
(Rear) / min.: -14%, max.: 113.5%Changes depending on the set
temperature (Rear)-
A/O DAMP TARG-RAir outlet damper target position
(Rear) / min.: -14%, max.: 113.5%Changes depending on air outlet
damper position (Rear)-
BLOWER LEVEL-RBlower motor speed level (Rear) /
min.: Level 0, max: Level 31Changes depending on blower
level (Rear)-
SET TEMP SHIFT Shift set temperatureChanges depending on shift set
temperature *1-
AIR INLET MODE Air inlet modeChanges depending on air inlet
mode *1-
COMPRESSOR MODE Compressor modeChanges depending on
compressor mode *1-
COMPRS/DEF MODE Compressor/DEF operation modeChanges depending on
compressor/DEF operation mode
*1-
FOOT/DEF OPER Foot/DEF auto modeChanges depending on Foot/DEF
auto mode *1-
AUTO BLOW UPFoot/DEF automatic blow up
functionChanges depending on Foot/DEF
automatic blow up function *1-
#CODESNumber of Trouble Codes / min.:
0, max.: 255-- Tester Display Measurement Item/Range Normal Condition Diagnostic Note

AC–26AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This sensor detects the 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 B1411/11 Room Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1411/11 Room temperature sensor circuit (Open or short)• A/C room temperature sensor
• Harness or connector between A/C room
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E16

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–29
AC
DESCRIPTION
The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature
which is used to control the air conditioner "AUTO" mode. This sensor is connected to the A/C amplifier
and detects fluctuations in the ambient temperature. This data is used for controlling the cabin
temperature. The sensor sends a signal to the A/C amplifier. The resistance of the ambient temperature
sensor changes in accordance with the ambient temperature. As the temperature decreases, the
resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the ambient temperature sensor and reads voltage changes as
the resistance of the ambient temperature sensor changes.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
DTC B1412/12 Ambient Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1412/12 Open or short in ambient temperature sensor circuit• Ambient temperature sensor
• Harness or connector between ambient
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E17

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–33
AC
DESCRIPTION
The evaporator temperature sensor (A/C thermistor) is installed on the evaporator in the air conditioning
unit. It detects the temperature of the cooled air that has passed through the evaporator and its signal is
used to control the air conditioning. It sends a signal to the A/C amplifier. The resistance of the evaporator
temperature sensor (A/C thermistor) changes in accordance with the temperature of the cooled air that
has passed through the evaporator. As the temperature decreases, the resistance increases. As the
temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the evaporator temperature sensor (A/C thermistor) and reads
voltage changes as the resistance of the evaporator temperature sensor (A/C thermistor) changes. This
sensor is used to prevent the evaporator from freezing.
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 item below in the DATA LIST, and read the
display on the intelligent tester.
DATA LIST / AIR CONDITIONER:
DTC B1413/13 Evaporator Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1413/13 Open or short in evaporator temperature sensor circuit• Evaporator temperature sensor
• Harness or connector between evaporator
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I035354E03
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
EVAP TEMP
(Evaporator thermistor)Evaporator thermistor / min.: -
29.7
C (-21.46F), max.: 59.55C
(139.19F)Actual evaporator temperature is
displayed-

AC–36AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
The rear evaporator temperature sensor is installed on the rear evaporator. It detects the rear evaporator
temperature. The sensor sends a signal to the A/C amplifier. The resistance of the rear evaporator
temperature sensor changes in accordance with the rear evaporator temperature. As the temperature
decreases, the resistance increases. As the temperature increases, the resistance decreases.
The A/C amplifier applies voltage (5 V) to the rear evaporator temperature sensor and reads voltage
changes as the resistance of the rear evaporator temperature sensor changes.
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 B1417/17 Rear Evaporator Temperature Sensor Circuit
DTC No. DTC Detection Condition Trouble Area
B1417/17Open or short in rear evaporator temperature sensor
circuit• Rear evaporator temperature sensor
• Harness or connector between rear evaporator
temperature sensor and A/C amplifier
• A/C amplifier
1READ VALUE OF INTELLIGENT TESTER
I008282E19