2007 TOYOTA SIENNA wiring diagram

TW–80TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
This is the power source for the tire pressure warning ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU
using the intelligent tester and write them down before removal.
It is necessary to register an ID code after replacing the tire pressure warning valve and
transmitter and/or the tire pressure warning ECU (See page TW-20).
(a) Remove the ECU-IG fuse from the instrument panel
junction block.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1
NG
ECU Power Source Circuit
1INSPECT FUSE (ECU-IG)
C162809E01
REPLACE FUSE

TW–82TIRE AND WHEEL – TIRE PRESSURE WARNING SYSTEM
TW
DESCRIPTION
DTC output mode is set by connecting terminals 13 (TC) and 4 (CG) of the DLC3. The DTCs are indicated
by blinks of the tire pressure warning light.
WIRING DIAGRAM
HINT:
When each warning light blinks continuously, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in an ECU connected to this circuit may have occurred.
INSPECTION PROCEDURE
NOTICE:
When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU
using the intelligent tester and write them down before removal.
It is necessary to register an ID code after replacing the tire pressure warning valve and
transmitter and/or the tire pressure warning ECU (See page TW-20).
TC and CG Terminal Circuit
E110507E38

BC–26BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the
intelligent tester.
(a) Select the DATA LIST mode on the intelligent tester.
ABS:
(b) Check that there is the speed value output from the
speed sensor displayed on the intelligent tester and the
speed value displayed on the speedometer are almost
the same when driving the vehicle.
OK:
The speed value output from the speed sensor
displayed on the intelligent tester is the same as
the actual vehicle speed.
NG
OK
1READ VALUE OF INTELLIGENT TESTER (REAR SPEED SENSOR)
F040100E03
Item (Display)Measurement Item / Range
(Display)Normal Condition Diagnostic Note
WHEEL SPD RRWheel speed sensor (RR) reading
/ min.: 0 km/h (0 mph), max.: 326
km/h (202 mph)Actual wheel speedSimilar speed as indicated on
speedometer
WHEEL SPD RLWheel speed sensor (RL) reading
/ min.: 0 km/h (0 mph), max.: 326
km/h (202 mph)Actual wheel speedSimilar speed as indicated on
speedometer
Go to step 3

BC–20BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
HINT:
• DTC No. C0200/31 and C1235/35 are for the front speed sensor RH.
• DTC No. C0205/32 and C1236/36 are for the front speed sensor LH.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the intelligent tester and start from step 2 when not using the
intelligent tester.
(a) Select the DATA LIST mode on the intelligent tester.
ABS:
DTC No. DTC Detection Condition Trouble Area
C0200/31
C0205/32With vehicle speed at 10 km/h (6 mph) or more, sensor
signal circuit of faulty wheel is open or short for 1
second or more.
• Momentary interruption of sensor signal of faulty
wheel has occurred 7 times or more.
• Sensor signal circuit is open for 0.5 seconds or
more.• Front speed sensor RH/LH
• Front speed sensor RH/LH circuit
• Speed sensor rotor
• Sensor installation
• Brake actuator assembly
C1235/35
C1236/36At vehicle speed of 20 km/h (12 mph) or more,
condition that noise is included in speed sensor signal
continues for 5 seconds or more.• Front speed sensor RH/LH
• Speed sensor rotor
• Sensor installation
• Brake actuator assembly
1READ VALUE OF INTELLIGENT TESTER (FRONT SPEED SENSOR)
F040884E10
Item (Display)Measurement Item / Range
(Display)Normal Condition Diagnostic Note
WHEEL SPD FRWheel speed sensor (FR)
reading / min.: 0 km/h (0 mph),
max.: 326 km/h(202 mph)Actual wheel speedSimilar speed as indicated on
speedometer

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–31
BC
DESCRIPTION
The solenoid comes on when signals are received from the ECU and controls the pressure acting on the
wheel cylinders, thus controlling brake force.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
These codes are detected when a problem is identified in the
brake actuator.
The solenoid circuit is in the brake actuator.
Therefore, solenoid circuit inspection and solenoid unit
inspection cannot be performed. Be sure to check if any DTC
is output before replacing the brake actuator assembly.
DTC C0226/21 SFR Solenoid Circuit
DTC C0236/22 SFL Solenoid Circuit
DTC C0246/23 SRR Solenoid Circuit
DTC C0256/24 SRL Solenoid Circuit
DTC No. DTC Detection Condition Trouble Area
C0226/21
When either of the following is detected:
• With IG1 terminal voltage at 10 V to 16 V, solenoid
circuit is an open or short for 0.05 seconds or more.
• With IG1 terminal voltage at 10 V to 16 V, during
ABS control solenoid relay contact is off for 0.05
seconds or more.• SFRH or SFRR circuit
• Brake actuator assembly
C0236/22• SFLH or SFLR circuit
• Brake actuator assembly
C0246/23• SRRH or SRRR circuit
• Brake actuator assembly
C0256/24• SRLH or SRLR circuit
• Brake actuator assembly
1RECONFIRM DTC
F045115E01

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–33
BC
DESCRIPTION
The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU turns
the motor relay on and operates the ABS pump motor.
If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage
from the battery/alternator, the DTCs may be stored.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
After steps 1, 2 and 3 are completed, start the inspection from step 4 when using the intelligent tester, and
from step 5 when not using the intelligent tester.
(a) Remove the ABS 1 fuse from the FL block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
DTC C0273/13 Open in ABS Motor Relay Circuit
DTC C0274/14 Short to B+ in ABS Motor Relay Circuit
DTC No. DTC Detection Condition Trouble Area
C0273/13With the IG1 terminal voltage 10 V or less during initial
check or ABS control, pump motor relay is turned ON
and relay contact is not ON for 0.2 seconds or more.• ABS 1 fuse
• ABS motor relay
• ABS motor relay circuit
• Brake actuator assembly
C0274/14The motor contact is ON for 3 seconds or more when
the motor relay is OFF.• ABS 1 fuse
• ABS motor relay
• ABS motor relay circuit
• Brake actuator assembly
1INSPECT FUSE (ABS 1 FUSE)
C119436E01
Tester Connection Specified Condition
ABS 1 (50 A) fuse Below 1
(Continuity)

BC–36BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM
BC
DESCRIPTION
This relay supplies power to each ABS solenoid.
Immediately after the ignition switch is turned to the ON position, the relay turns on if the solenoid is
determined to be normal as a result of self-diagnosis during initial check.
The relay turns off if an open/short is detected.
If the voltage supplied to the motor relay (+BS) is below the DTC detection threshold due to low voltage
from the battery/alternator, the DTCs may be stored.
WIRING DIAGRAM
Refer to DTCs C0226/21, C0236/22, C0246/23 and C0256/24 (See page BC-29).
INSPECTION PROCEDURE
(a) Remove the ABS 2 fuse from the FL block.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
DTC C0278/11 Open in ABS Solenoid Relay Circuit
DTC C0279/12 Short to B+ in ABS Solenoid Relay Circuit
DTC No. DTC Detection Condition Trouble Area
C0278/11The solenoid relay contact is OFF for 0.2 seconds or
more when the solenoid relay is turned ON.• ABS 2 fuse
• ABS solenoid relay
• ABS solenoid relay circuit
• Brake actuator assembly
C0279/12The solenoid relay contact is ON for 0.2 seconds or
more when the solenoid relay is OFF.• ABS 2 fuse
• ABS solenoid relay
• ABS solenoid relay circuit
• Brake actuator assembly
1INSPECT FUSE (ABS 2 FUSE)
Tester Connection Specified Condition
ABS 2 (30 A) fuse Below 1
(Continuity)
REPLACE FUSE (ABS 2 FUSE)

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEMBC–39
BC
DESCRIPTION
If there is a problem with the brake actuator assembly (skid control ECU) power supply circuit, the skid
control ECU outputs the DTC and prohibits the ABS operation with the fail safe function.
If the voltage supplied to the IG1 terminal is not within the DTC detection threshold due to malfunctions in
such as the battery and alternator circuit, this DTC is stored.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
After steps 1 and 2 are completed, start the inspection from step 3 when using the intelligent tester, and
from step 4 when not using the intelligent tester.
DTC C1241/41 Low Battery Positive Voltage
DTC No. DTC Detection Condition Trouble Area
C1241/41When any of the following is detected:
• Vehicle speed is 3 km/h (1.8 mph) or
more and IG1 terminal voltage is 9.5 V or
less for at least 10 seconds.
• While the solenoid relay is ON, the IG1
terminal voltage is 10 V or less and the
relay contact is open solenoid fault
detecting conditions are established.
• Voltage of ECU terminal IG1 remains at
more than 17 V for 1 second or more..• Battery
•ECU-IG fuse
• Charging system
• Power source circuit
F045116E05