TOYOTA SIENNA 2007 Service Repair Manual

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

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–23
AC
B1433/33 Air Outlet Damper Position
Sensor Circuit1. Air outlet damper
position sensor (Air outlet
control servo motor)
2. A/C amplifier (A/C
control assembly)
3. Harness or connector
between air outlet damper
position sensor and A/C
amplifier (A/C control
assembly)Memorized
(1 min. or more)AC-77
B1436/36 Air Mix Damper Position
Sensor Circuit (Driver
Side)1. Air mix damper position
sensor (Air mix control
servo motor)
2. Harness or connector
between air mix damper
position sensor and A/C
amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(1 min. or more)AC-81
B1437/37 Rear Air Mix Damper
Position Sensor Circuit1. Rear air mix damper
position sensor (Rear air
mix control servo motor)
2. A/C amplifier (A/C
control assembly)
3. Harness or connector
between rear air mix
damper position sensor
and A/C amplifier (A/C
control assembly)AC-85
B1439/39 Rear Air Outlet Damper
Position Sensor Circuit1. Rear air outlet damper
position sensor (Rear air
outlet control servo motor)
2. Harness or connector
between rear air outlet
damper position sensor
and A/C amplifier (A/C
control assembly)
3. A/C amplifier (A/C
control assembly)AC-89
B1441/41 Air Mix Damper Control
Servo Motor Circuit
(Passenger Side)1. Air mix control servo
motor
2. Harness or connector
between air mix control
servo motor and A/C
amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-93
B1442/42 Air Inlet Damper Control
Servo Motor Circuit1. Air inlet control servo
motor
2. Harness or connector
between air inlet control
servo motor and A/C
amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-98
B1443/43 Air Outlet Damper Control
Servo Motor Circuit1. Air outlet control servo
motor
2. Harness or connector
between air outlet control
servo motor and A/C
amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-103 DTC Code Detection Item Trouble Area Memory See page

AC–24AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
HINT:
•
*1: If the cabin temperature is approximately -18.6C (-
3.7
F) or lower, DTC B1411/11 may be output even though
the system is normal.
•
*2: If the check is being performed in a dark place, DTC
B1421/21 or B1424/24 (solar sensor circuit abnormal)
could be displayed.
•
*3: Short in the circuit.
•
*4: Open in the circuit.
ACTUATOR CHECK
1. ACTUATOR CHECK
(a) After entering the DTC check mode (Sensor Check
Mode), press the R/F switch.
B1446/46 Air Mix Damper Control
Servo Motor Circuit (Driver
Side)1. Air mix control servo
motor
2. Harness or connector
between air mix control
servo motor and A/C
amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-108
B1447/47 Rear Air Mix Damper
Control Servo Motor
Circuit1. Rear air mix control
servo motor (Water valve
servo motor)
2. Harness or connector
between A/C amplifier (A/
C control assembly) and
rear air mix control servo
motor
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-113
B1449/49 Rear Air Outlet Damper
Control Servo Motor
Circuit1. Rear air outlet control
servo motor
2. Harness or connector
between rear air outlet
control servo motor and A/
C amplifier (A/C control
assembly)
3. A/C amplifier (A/C
control assembly)Memorized
(15 sec.)AC-118
B1451/51 Compressor Solenoid
Circuit1. A/C compressor
2. Harness or connector
between A/C amplifier (A/
C control assembly) and
solenoid of externally
changeable compressor
3. A/C amplifier-AC-123
B1499/99 Multiplex Communication
Circuit1. Multiplex
communication system
(BEAN)
2. CAN communication
systemMemorizedAC-126 DTC Code Detection Item Trouble Area Memory See page
I035391

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–25
AC
(b) As each damper, motor and relay automatically
operate actuator check at 1-second intervals from
step No. 1 to No. 10 continuously, check the
temperature and air flow visually and by hand.
If the slower display is desired, press the DEF
switch and change it to step operation. Each time
the DEF switch is pressed, the display changes by 1
step.
HINT:
• Codes are displayed from smaller to larger
numbers in order.
• To cancel the check mode, press the OFF switch.
Step No.Display
codeConditions
Fr. Blower
levelFr. Air flow
ventAir inlet
damperMagnetic
clutchFr. Driver,
passenger
side air
mix
damperRr. Blower
levelRr. Air flow
ventRr. Air mix
damper
1 0 0 FACE FRESH OFF"COOL"
side
(Full
closed)0 FACE1"COOL"
side
(Full
closed)
2 1 1 FACE FRESH OFF"COOL"
side
(Full
closed)1 FACE1"COOL"
side
(Full
closed)
3 2 16 FACE FRESH ON"COOL"
side
(Full
closed)10 FACE1"COOL" /
"HOT"
(40% open)
4316FACEFRESH /
RECIRCUL
AT I O NON"COOL"
side
(Full
closed)10 FACE2"COOL" /
"HOT"
(40% open)
5416FACERECIRCUL
AT I O NON"COOL" /
"HOT"
(50% open)10 B/L"COOL" /
"HOT"
(40% open)
6516B/LRECIRCUL
AT I O NON"COOL" /
"HOT"
(50% open)10 B/L"COOL" /
"HOT"
(60% open)
7616FOOTRECIRCUL
AT I O NON"HOT" side
(Full open)10 B/L"COOL" /
"HOT"
(60% open)
8716FOOTRECIRCUL
AT I O NON
"HOT" side
(Full open)10 FOOT"COOL" /
"HOT"
(60% open)
9816FOOT /
DEF.RECIRCUL
AT I O NON"HOT" side
(Full open)10 FOOT"COOL" /
"HOT"
(86.5%
open)
10931DEF.RECIRCUL
AT I O NON"HOT" side
(Full open)31 FOOT"COOL" /
"HOT"
(86.5%
open)

AC–182AIR CONDITIONING – AIR CONDITIONING UNIT
AC
REMOVAL
1. RECOVER REFRIGERANT FROM REFRIGERATION
SYSTEM (See page AC-172)
2. REMOVE FRONT WIPER ARM HEAD CAP (See page
WW-4)
3. REMOVE FRONT WIPER ARM RH (See page WW-4)
4. REMOVE FRONT WIPER ARM LH (See page WW-4)
5. REMOVE COWL TOP VENTILATOR LOUVER SUB-
ASSEMBLY (See page WW-4)
6. REMOVE WINDSHIELD WIPER MOTOR AND LINK
ASSEMBLY (See page WW-4)
7. REMOVE FRONT COWL TOP OUTER PANEL SUB-
ASSEMBLY (See page SP-13)
8. DISCONNECT COOLER REFRIGERANT LIQUID PIPE
E (TO COOLER UNIT)
(a) Install SST on the piping clamp.
SST 09870-00025
HINT:
Make sure the direction of the piping clamp claw
and SST by checking the illustration shown on the
caution label.
(b) Push down SST and release the clamp lock.
NOTICE:
Be careful not to deform the tube when pushing
SST.
(c) Pull SST slightly, push the release lever, and then
remove the piping clamp with SST.
(d) Disconnect the cooler refrigerant liquid pipe (to
cooler unit).
NOTICE:
• Do not use any tools like a screwdriver to
remove the tube.
• Seal the openings of the disconnected parts
using vinyl tape to prevent entry of moisture
and foreign matter.
9. DISCONNECT SUCTION HOSE SUB-ASSEMBLY
SST 09870-00015
HINT:
Disconnection of the pipe cooler refrigerant suction hose
sub-assembly is the same way as the cooler refrigerant
liquid pipe E (to cooler unit).
10. REMOVE AIR CLEANER CAP SUB-ASSEMBLY (See
page IT-4)
I003839E05
I006919E14

AIR CONDITIONING – AIR CONDITIONING UNITAC–183
AC
11. DISCONNECT HEATER WATER OUTLET HOSE A
(FROM HEATER UNIT)
(a) Using pliers, grip the claws of the clip and slide the
clip to disconnect the heater water outlet hose A
(from heater unit).
12. REMOVE HEATER WATER INLET HOSE A
HINT:
Disconnection of the heater water inlet hose A is the
same way as the heater water outlet hose A (from heater
unit).
13. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY
WITH PASSENGER AIRBAG ASSEMBLY
HINT:
Refer to the instructions for removal of the instrument
panel sub-assembly with passenger airbag assembly
(See page IP-5).
14. REMOVE SPIRAL CABLE (See page RS-434)
15. REMOVE NO. 3 HEATER TO FOOT DUCT
(a) Remove the clip and the No. 3 heater to foot duct.
16. REMOVE NO. 1 HEATER TO FOOT DUCT
(a) Remove the clip and the No. 1 heater to foot duct.
17. DISCONNECT TRANSMISSION CONTROL CABLE
ASSEMBLY
HINT:
(See page AX-154 for U151E, AX-154 for U151F)
18. REMOVE SHIFT LEVER ASSEMBLY
HINT:
(See page AX-147 for U151E, AX-147 for U151F)
19. REMOVE NO. 5 INSTRUMENT PANEL BRACKET
(a) Release the 2 clamps and disconnect the
connector.
I035742
I034865
I035500
E145274E01

AC–184AIR CONDITIONING – AIR CONDITIONING UNIT
AC
(b) Remove the 4 nuts and the No. 5 instrument panel
bracket.
20. REMOVE NO. 1 INSTRUMENT PANEL BRACE SUB-
ASSEMBLY
(a) Release the 4 clamps and remove the bolt.
(b) Disconnect the connector.
(c) Remove the 3 bolts, the 2 nuts and the No. 1
instrument panel brace sub-assembly.
21. REMOVE NO. 2 INSTRUMENT PANEL BRACE SUB-
ASSEMBLY
(a) Release the 2 clamps and disconnect the
connector.
(b) Remove the 3 bolts, the 2 nuts and the No. 2
instrument panel brace sub-assembly.
22. SEPARATE STEERING INTERMEDIATE SHAFT
ASSEMBLY (See page SR-7)
23. REMOVE STEERING COLUMN ASSEMBLY (See page
SR-7)
24. REMOVE STEREO COMPONENT AMPLIFIER
ASSEMBLY (w/ Stereo Component Amplifier) (See
page AV- 1 7 3)
I034863
E145275E01
I034866
E145276E01
I034868

AIR CONDITIONING – AIR CONDITIONING UNITAC–185
AC
25. REMOVE ECM (See page ES-498)
26. REMOVE FRONT FENDER GARNISH RH
HINT:
See page ET-35.
27. REMOVE INSTRUMENT PANEL REINFORCEMENT
(a) Remove the 6 nuts.
(b) Release the 13 clamps.
(c) Remove the screw.
(d) Disconnect the connectors.
(e) Remove the 11 bolts, 2 nuts and the instrument
panel reinforcement.
E145277E01
I034871

AC–186AIR CONDITIONING – AIR CONDITIONING UNIT
AC
28. REMOVE LOWER DEFROSTER NOZZLE ASSEMBLY
(a) Release the 4 claw fittings and remove the lower
defroster nozzle assembly.
29. REMOVE AIR CONDITIONING UNIT ASSEMBLY
(a) Release the 2 claw fittings and remove the nut and
the air conditioning unit assembly.
DISASSEMBLY
1. REMOVE BLOWER ASSEMBLY
(a) Remove the 2 screws and the blower assembly.
2. REMOVE MODE DAMPER SERVO SUB-ASSEMBLY
(a) Remove the 3 screws and the mode damper servo
sub-assembly.
3. REMOVE AIRMIX DAMPER SERVO SUB-ASSEMBLY
(a) Remove the 3 screws and the airmix damper servo
sub-assembly.
E145278
E145279
I035464
I035465
I035466