2007 TOYOTA SIENNA wiring

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–135
AC
DESCRIPTION
When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/
C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Use the intelligent tester to check if the CAN
communication system is functioning normally.
Result
Air Conditioning Compressor Magnetic Clutch Circuit
1CHECK CAN COMMUNICATION SYSTEM
E124490E08
Result Proceed to
CAN DTC is not output A
CAN DTC is output B

AC–140AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
This is the rear A/C system control signal circuit as well as the power supply circuit of the rear A/C control
assembly.
Pulse signals regarding rear A/C control panel switch operation are transmitted between the A/C amplifier
and rear A/C control assembly.
WIRING DIAGRAM
Rear Air Conditioning Control Panel Circuit
E147373E01

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–143
AC
DESCRIPTION
The RR A/C relay is switched on by signals from the A/C amplifier. It supplies power to the rear blower
motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Remove the RR A/C relay from the No. 3 relay block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
Rear Air Conditioning Relay Circuit
1INSPECT RELAY (RR A/C)
E147374E01
E148195
Tester Connection Condition Specified Condition
3 - 4 Always Below 1
3 - 4When battery voltage
applied to terminals 1
and 210 k or higher
3 - 5 Always 10 k
or higher
3 - 5When battery voltage
applied to terminals 1
and 2Below 1
REPLACE RELAY (RR A/C)

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–145
AC
DESCRIPTION
Power to the rear blower motor is supplied from the battery via the RR A/C relay.
The rear blower motor speed level varies between 0 and 31 based on the voltage difference measured
between the terminals of the motor.
The voltage difference measured between the terminals of the rear blower motor changes in proportion to
the control at the rear blower motor controller on the ground side.
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
Rear Blower Motor Circuit
1READ VALUE OF INTELLIGENT TESTER
E147375E02
Tester Display Measurement Item/Range Normal Condition Diagnostic Note
BLOWER LEVEL-RBlower motor speed level (Rear) /
min.: Level 0, max.: Level 31Changes depending on blower
level (Rear)-

AC–150AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
The main power source is supplied to the A/C amplifier when the ignition switch is turned to the ON
position.
The power source is used for operating the A/C amplifier and servo motor, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the engine before inspection. Check the IG1 relay or battery if the engine does not start.
(a) Remove the HTR fuse from the driver side junction
block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
IG Power Source Circuit
1INSPECT FUSE (HTR)
E130466E04
Tester Item Condition Specified Condition
HTR fuse Always Below 1
REPLACE FUSE (HTR)

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–153
AC
DESCRIPTION
This circuit supplies power to the A/C amplifier and the illumination for the clock.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Remove the ECU ACC fuse from the engine room relay
block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
ACC Power Source Circuit
1INSPECT FUSE (ECU ACC)
E146556E02
Tester Item Condition Specified Condition
ECU ACC Fuse Always Below 1
REPLACE FUSE (ECU ACC)

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 ignition switch is
off and is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Remove the ECU-B fuse from the engine room junction
block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
Back-up Power Source Circuit
1INSPECT FUSE (ECU-B)
E146556E03
Tester Item Condition Specified Condition
ECU-B Fuse Always Below 1
REPLACE FUSE (ECU-B)

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