2007 TOYOTA SIENNA wiring diagram

BC–154BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The BRAKE warning light comes on when the brake fluid is insufficient, the parking brake is applied or the
EBD is defective.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When releasing the parking brake, move the shift lever into the P position in an AT vehicle, and choke in
an MT vehicle to hold the vehicle for safety.
Brake Warning Light Remains ON
C160966E02

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–159
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
When the traction OFF switch is turned on, the TRAC OFF indicator light will come on (for 2WD model).
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
TRAC OFF Indicator Light Remains ON
C159741E02

BC–164BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
When the traction OFF switch is turned on, the TRAC OFF indicator light will come on (for 2WD model).
WIRING DIAGRAM
Refer to TRAC OFF Indicator Light Remains ON (See page BC-157).
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
(a) Check if the CAN communication system DTC is output
(See page CA-17).
Result
B
A
(a) Check if the multiplex communication system DTC is
output (See page MP-14).
Result
B
A
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the Active Test mode on the intelligent tester (See
page BC-85).
ABS / VSC:
TRAC OFF Indicator Light does not Come ON
1CHECK CAN COMMUNICATION SYSTEM
Result Proceed to
CAN communication system DTC is not output A
CAN communication system DTC is output B
INSPECT CAN COMMUNICATION SYSTEM
2CHECK MULTIPLEX COMMUNICATION SYSTEM
Result Proceed to
Multiplex communication system DTC is not output A
Multiplex communication system DTC is output B
INSPECT MULTIPLEX COMMUNICATION
SYSTEM
3CHECK TRAC OFF INDICATOR LIGHT
Tester Display Test Part Control Range Diagnostic Note
VSC / TRAC OFF IND TRAC OFF indicator light Indicator light ON / OFF Observe combination meter

BC–166BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
The SLIP indicator blinks during VSC and/or TRAC operation.
When the system fails, the SLIP indicator comes on to warn the driver.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
(a) Check if the CAN communication system DTC is output
(See page CA-17).
Slip Indicator Light Remains ON
1CHECK CAN COMMUNICATION SYSTEM
C160968E04

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–169
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
The SLIP indicator blinks during VSC and/or TRAC operation.
When the system fails, the SLIP indicator comes on to warn the driver.
WIRING DIAGRAM
Refer to Slip Indicator Light Remains ON (See page BC-164).
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
(a) Check if the CAN communication system DTC is output
(See page CA-17).
Result
B
A
(a) Check if the multiplex communication system DTC is
output (See page MP-14).
Result
B
A
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the Active Test mode on the intelligent tester (See
page BC-85).
ABS / VSC:
Slip Indicator Light does not Come ON
1CHECK CAN COMMUNICATION SYSTEM
Result Proceed to
CAN communication system DTC is not output A
CAN communication system DTC is output B
INSPECT CAN COMMUNICATION SYSTEM
2CHECK MULTIPLEX COMMUNICATION SYSTEM
Result Proceed to
Multiplex communication system DTC is not output A
Multiplex communication system DTC is output B
INSPECT MULTIPLEX COMMUNICATION
SYSTEM
3CHECK SLIP INDICATOR LIGHT
Tester Display Test Part Control Range Diagnostic Note
SLIP INDI LIGHT SLIP indicator light Indicator light ON / OFF Observe combination meter

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–171
BC
DESCRIPTION
The skid control buzzer sounds and SLIP indicator blinking during VSC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Connect the intelligent tester to the DLC3.
(b) Start the engine.
(c) Select the item "VSC / BR WARN BUZ" in the ACTIVE
TEST and operate the skid control buzzer on the
intelligent tester.
ABS / VSC:
(d) Check that skid control buzzer sounds by operating with
the intelligent tester.
OK:
The skid control buzzer sounds in accordance with
operation of the intelligent tester.
NG
Skid Control Buzzer Circuit
1PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SKID CONTROL BUZZER)
C132930E07
Tester Display Test Part Control Range Diagnostic Note
VSC / BR WARN BUZ Skid control buzzer Buzzer ON / OFF Buzzer can be heard
Go to step 2

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–173
BC
DESCRIPTION
Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS
warning light and/or VSC warning light.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (See page BC-70).
(a) Check if the CAN communication system DTC is output
(See page BC-82).
Result
B
TC and CG Terminal Circuit
1CHECK CAN COMMUNICATION SYSTEM
C136991E03
Result Proceed to
CAN communication system DTC is not output A
CAN communication system DTC is output B
INSPECT CAN COMMUNICATION SYSTEM

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–177
BC
DESCRIPTION
In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is
stopped is detected while driving.
Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3
and turning the ignition switch from off to the ON position.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) Disconnect the skid control ECU connector.
TS and CG Terminal Circuit
1INSPECT DLC3
F045121E03
E106867E20
Tester Connection Specified Condition
D1-12 (TS) - D1-4 (CG) 10 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR
2CHECK HARNESS AND CONNECTOR (TS of DLC3 - SKID CONTROL ECU)