2007 TOYOTA SIENNA Service Repair Manual

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Page 2897 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AC–154AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the voltage according to the value(

Page 2898 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–155
AC
DESCRIPTION
This is the back-up power source for the A/C amplifier. Power is supplied even when the

Page 2899 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AC–156AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Disconnect the connector from the A/C amplifier.
(b) Measure the voltage according to the value(

Page 2900 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–11
AC
TERMINALS OF ECU
1. A/C AMPLIFIER
Terminal No. (Symbols) Wiring Color Terminal Description ConditionS

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–11
AC
TERMINALS OF ECU
1. A/C AMPLIFIER
Terminal No. (Symbols) Wiring Color Terminal Description ConditionSpecified Condition
A9-1 (GND) - Body ground W-B - Body ground Ground Always Below 1 V
A9-2 (MPX+) - A9-1
(GND)V - W-BMultiplex communication
signalIG SW: ON Pulse generation
A9-3 (MPX-) - A9-1 (GND) R-L - W-BMultiplex communication
signalIG SW: ON Pulse generation
A9-4 (SOL+) - A9-1 (GND) L - W-BA/C compressor operation
signalEngine is running
A/C switch: ON
Blower switch: LOPulse generation
(See waveform 2)
A9-5 (MGC) - A9-1 (GND) R-L - W-BA/C compressor magnetic
clutch operation signalIG SW: ON
Blower switch: LO
A/C switch: OFF
ON10 to 14 V Below 1 V
A9-6 (BLW) - A9-1 (GND) Y-P - W-BBlower motor speed
control signalIG SW: ON
Front blower: OperatePulse generation
(See waveform 1)
A9-8 (HRH) - A9-1 (GND) R-G - W-BRear A/C relay operation
signalIG SW: ON
Rear blower: OFF
ON10 to 14 V Below 1 V
A9-9 (LOCK) - A9-1
(GND)W-L - W-BA/C compressor lock
sensor signalEngine is running
Blower switch: LO
A/C switch: ONPulse generation
(See waveform 3)
A9-10 (S5-5) - A9-24 (SG-
6)P - W-GPower supply for A/C
pressure sensorIG SW: OFF
ON
A/C switch: ONBelow 1 V 4.5 to 5.5 V
A9-11 (TSP) - Body
groundY-B - Body groundA/C solar sensor signal
(Passenger side)IG SW: ON
Solar sensor subject to electric
light0.8 to 4.3 V
A9-12 (AMDH) - A9-1
(GND)L-Y - W-BAir mix control servo motor
signal (Driver side)IG SW: ON
Driver side set temp.: MAX.
COOL
MAX. HOTBelow 1 V
10 to 14 V
A9-13 (AMDC) - A9-1
(GND)L - W-BAir mix control servo motor
signal (Driver side)IG SW: ON
Driver side set temp.: MAX.
HOT
MAX. COOLBelow 1 V 10 to 14 V
A9-14 (AMPH) - A9-1
(GND)L-B - W-BAir mix control servo motor
signal (Front passenger
side)IG SW: ON
Passenger side set temp.: MAX.
COOL
MAX. HOTBelow 1 V
10 to 14 V
A9-15 (AMPC) - A9-1
(GND)L-W - W-BAir mix control servo motor
signal (Front passenger
side)IG SW: ON
Passenger side set temp.: MAX.
HOT
MAX. COOLBelow 1 V
10 to 14 V
A9-16 (AIF) - A9-1 (GND) BR-W - W-BAir inlet control servo
motor signalIG SW: ON
R/F SW: RECIRCULATION

FRESHBelow 1 V 10 to 14 V
A9-17 (AIR) - A9-1 (GND) R - W-BAir inlet control servo
motor signalIG SW: ON
R/F SW: FRESH

RECIRCULATIONBelow 1 V 10 to 14 V
A9-18 (IG) - A9-1 (GND) R-Y - W-B Power source (IG) IG SW: LOCK
ON Below 1 V 10 to 14 V
A9-19 (ACC) - A9-1 (GND) P - W-B Accessory (ON) IG SW: ACC 10 to 14 V
A9-20 (B) - A9-1 (GND) W-L - W-B Power source (Back-up) Always 10 to 14 V
E145189E01

Page 2901 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AC–12AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
A9-21 (SG-1) - A9-1
(GND)GR-L - W-B Signal ground Always Below 1 V
A9-22 (SG-4) - A9-1
(GND)Y - W-B

AC–12AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
A9-21 (SG-1) - A9-1
(GND)GR-L - W-B Signal ground Always Below 1 V
A9-22 (SG-4) - A9-1
(GND)Y - W-B Signal ground Always Below 1 V
A9-23 (SG-5) - A9-1
(GND)W-R - W-B Signal ground Always Below 1 V
A9-24 (SG-6) - A9-1
(GND)W-G - W-B Signal ground Always Below 1 V
A9-26 (TPD) - A9-21 (SG-
1)GR-B - GR-LAir mix control servo motor
position signal (for driver
side)IG SW: ON
Driver side set temp. MAX. HOT
MAX. COOL1.0 4.0 V
A9-27 (TPP) - A9-21 (SG-
1)L-R - GR-LAir mix control servo motor
position signal (for front
passenger side)IG SW: ON
Passenger side set temp. MAX.
HOT
MAX. COOL1.0
4.0 V
A9-28 (TPI) - A9-21 (SG-
1)GR - GR-LAir inlet control servo
motor position signalIG SW: ON
Front R/F switch FRESH

RECIRCULATION1.0 4.0 V
A9-29 (TPO) - A9-21 (SG-
1)LG - GR-LAir outlet control servo
motor position signalIG SW: ON
Front mode switch: FOOT

DEF.1.0 4.0 V
A9-30 (S5-1) - A9-21 (SG-
1)P-L - GR-LPower source for servo
motor position sensorsIG SW: LOCK
ON Below 1 V 5.0 V
A9-31 (TSD) - Body
groundY- R - B o d y g r o u n dA/C solar sensor signal
(Driver side)IG SW: ON
Solar sensor subject to electric
light0.8 to 4.3 V
A9-32 (TAM) - A9-1 (GND) B-R - W-BA/C ambient temperature
sensor signalIgnition switch ON at 25
C
(77F)1.35 to 1.75 V
A9-33 (TR) - A9-23 (SG-5) G-W - W-RA/C room temperature
sensor signalIG SW: ON
Front cabin temp.: 25
C (77F)
40C (104F)1.8 to 2.2 V
1.2 to 1.6 V
A9-34 (TE) - A9-22 (SG-4) G-B - YFront A/C evaporator
temperature sensor signalFront evaporator temp.: 0
C
(32
F) 15C (59F)2.0 to 2.4 V 1.4 to 1.8 V
A9-35 (PRE) - A9-24 (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
A9-35 (PRE) - A9-24 (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
A9-35 (PRE) - A9-24 (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) and less than 196 kPa (2.0
kgf/cm
2, 28 psi))0.76 to 4.74 V
A9-37 (ILL-) - A9-1 (GND) W-R - W-BIllumination signal
(Rheostat)Illumination light Max. Position Below 1 V
A9-38 (ILL+) - A9-1 (GND) G - W-B Illumination signalLight control switch TAIL or
HEAD10 to 14 V
A9-39 (AOD) - A9-1
(GND)G-O - W-BAir outlet control servo
motor drive signalIG SW: ON
Front mode switch: FOOT

DEF.Below 1 V 10 to 14 V
A9-40 (AOF) - A9-1 (GND) O - W-BAir outlet control servo
motor drive signalIG SW: ON
Front mode switch: DEF.

FOOTBelow 1 V 10 to 14 V
A10-1 (FOOT) - A9-1
(GND)G-Y - W-BRear air outlet control
servo motor signalIG SW: ON
Rear mode switch: FACE

FOOTBelow 1 V 10 to 14 V Terminal No. (Symbols) Wiring Color Terminal Description ConditionSpecified Condition

Page 2902 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–13
AC
(a) Waveform 1:
A10-2 (FACE) - A9-1
(GND)LG-B - W-BRear air outlet control
servo motor signalIG SW:

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–13
AC
(a) Waveform 1:
A10-2 (FACE) - A9-1
(GND)LG-B - W-BRear air outlet control
servo motor signalIG SW: ON
Rear mode switch: FOOT
FA C EBelow 1 V 10 to 14 V
A10-3 (MHH) - A9-1
(GND)V-Y - W-BRear air mix control servo
motor signalIG SW: ON
Rear set temp.: MAX. COOL

MAX. HOTBelow 1 V 10 to 14 V
A10-4 (MCH) - A9-1
(GND)GR-L - W-BRear air mix control servo
motor signalIG SW: ON
Rear set temp.: MAX. HOT

MAX. COOLBelow 1 V 10 to 14 V
A10-5 (BLWH) - A9-1
(GND)L-W - W-BRear blower motor control
signalIG SW: ON
Rear A/C blower: Operate1.7 to 2.0 V
A10-6 (VMH) - A9-1
(GND)P-B - W-BRear blower motor control
signalIG SW: ON
Rear A/C blower: Operate0 to 9 V
A10-7 (SWD) - A9-1
(GND)B - W-BCommunication signal (for
Rear A/C control)Rear A/C operated Pulse generation
A10-8 (DPD) - A9-1 (GND) W - W-BCommunication signal (for
Rear A/C control)Rear A/C operated Pulse generation
A10-9 (CLKR) - A9-1
(GND)V-R - W- BCommunication signal (for
Rear A/C control)Rear A/C operated Pulse generation
A10-10 (STX) - A9-1
(GND)B-O - W-BCommunication signal (for
Rear A/C control)Rear A/C operated Pulse generation
A10-11 (BLK) - A9-1
(GND)R-G - W-BCommunication signal (for
Rear A/C control)Rear A/C operated Pulse generation
A10-12 (S5) - A10-13 (SG) P-L - W-RPower source for rear air
outlet control servo motor
position sensorIG SW: LOCK
ON Below 1 V 5.0 V
A10-13 (SG) - A9-1 (GND) W-R - W-B Signal ground Always Below 1 V
A10-14 (SGND) - A9-1
(GND)BR-R - W-B Signal ground Always Below 1 V
A10-16 (RDSW) - A9-1
(GND)Y-G - W-B DEF relay signalIG SW: ON
RDEF SW: OFF
ON11 to 14 V Below 1 V
A10-17 (TEC) - A10-13
(SG)P-G - W-RRear evaporator
temperature sensor signalRear evaporator temp.: 0
C
(32
F) 15C (59F)2.0 to 2.4 V 1.4 to 1.8 V
A10-18 (TR) - A10-14
(SGND)G-R - BR-RRear room temperature
sensor signalIG SW: ON
Rear cabin temp.: 25
C (77F)
15C (59F)1.8 to 2.2 V
1.2 to 1.6 V
A10-20 (TPM) - A10-13
(SG)G - W-RRear air outlet control
servo motor position
signalIG SW: ON
Rear mode switch: FOOT

FA C E1.0 4.0 V
A10-21 (TPH) - A10-13
(SG)B - W-RRear air mix control servo
motor position signalIG SW: ON
Rear set temp. MAX. HOT

MAX. COOL1.0 4.0 V Terminal No. (Symbols) Wiring Color Terminal Description ConditionSpecified Condition
E103396E01
Item Contents
Terminal No. (Symbols) A9-6 (BLW) - A9-1 (GND)
Tool Setting 1 V/DIV., 500
s/DIV.
Vehicle ConditionIG SW: ON
Blower switch: ON

Page 2903 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AC–14AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(b) Waveform 2:
(c) Waveform 3:
DIAGNOSIS SYSTEM
1. CHECK DLC3
(a) The vehicle's ECM uses the ISO

Page 2904 of 3000

TOYOTA SIENNA 2007 Service Repair Manual AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–15
AC
NOTICE:
*: Before measuring the resistance, leave the
vehicle as is for at least 1 minute and do not

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