ecu TOYOTA SIENNA 2007 Service Repair Manual

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–147
BC
WIRING DIAGRAM
Refer to ABS Warning Light Remains ON (See page BC-141).
INSPECTION PROCEDURE
(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Check that the ABS warning light comes on.
OK:
ABS warning light comes on.
HINT:
If troubleshooting has been carried out according to the
PROBLEM SYMPTOMS TABLE, refer back to the table
and proceed to the next step (See page BC-79).
NG
OK
(a) Turn the ignition switch off.
(b) Disconnect the combination meter connector.
ABS Warning Light does not Come ON
1CHECK ABS WARNING LIGHT
Go to step 2
REPLACE BRAKE ACTUATOR ASSEMBLY
2CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–149
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
If the skid control ECU stores DTCs to shut down TRAC and VSC operation, the VSC warning light comes
on in the combination meter.
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).
VSC Warning Light Remains ON
1CHECK CAN COMMUNICATION SYSTEM
C160968E03

BC–150BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
Result
B
A
(a) Check if the multiplex communication system DTC is
output (See page MP-14).
Result
B
A
(a) Check if the skid control ECU connector is securely
connected.
OK:
The connector is securely connected.
NG
OK
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
NG
OK
(a) Check the combination meter (See page ME-4).
OK:
The combination meter is normal.
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 IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
CONNECT CONNECTOR TO ECU
CORRECTLY
4CHECK BATTERY
CHECK OR REPLACE CHARGING SYSTEM
OR BATTERY
5INSPECT COMBINATION METER ASSEMBLY

BC–152BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
DESCRIPTION
The skid control ECU is connected to the combination meter via CAN and multiplex communications.
If the skid control ECU stores DTCs to shut down TRAC and VSC operation, the VSC warning light comes
on in the combination meter.
WIRING DIAGRAM
Refer to VSC Warning Light Remains ON (See page BC-147).
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:
VSC Warning 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 VSC WARNING LIGHT
Tester Display Test Part Control Range Diagnostic Note
VSC WARN LIGHT VSC warning light Warning light ON / OFF Observe combination meter

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–155
BC
(a) Check that the brake fluid level is proper.
NG
OK
(a) Are the DTC recorded? (See page BC-82)
Result
B
A
(a) WHEN USING INTELLIGENT TESTER:
(1) Connect the intelligent tester to the DLC3.
(2) Start the engine.
(3) Select the item "BRAKE WARN LIGHT" in the
ACTIVE TEST and operate the BRAKE warning
light on the intelligent tester.
ABS / VSC:
(4) Check that "ON" and "OFF" of the BRAKE warning
light are indicated on the combination meter when
using the intelligent tester.
OK:
Turn the BRAKE warning light on or off in
accordance with the intelligent tester.
(b) WHEN NOT USING INTELLIGENT TESTER:
(1) Turn the ignition switch off and disconnect the
connector from the skid control ECU.
1CHECK BRAKE FLUID LEVEL
ADD BRAKE FLUID
2CHECK DTC
Result Proceed to
DTC is outputA
DTC is not outputB
Go to step 3
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
3CHECK BRAKE WARNING LIGHT
Tester Display Test Part Control Range Diagnostic Note
BRAKE WRN LIGHT BRAKE warning light Warning light ON / OFF Observe combination meter

BC–156BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(2) Ground terminal BRL of the skid control ECU.
(3) Turn the ignition switch to the ON position.
(4) Check that the brake warning light.
OK:
Turn the light on or off in accordance with the
connection of terminal GND and BRL.
NOTICE:
When replacing the brake actuator assembly,
perform zero point calibration (See page BC-70).
NG
OK
(a) Remove the parking brake switch connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Disconnect the skid control ECU connector and the
parking brake switch connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
G024767E52 Go to step 4
REPLACE BRAKE ACTUATOR ASSEMBLY
4INSPECT PARKING BRAKE SWITCH
G026238E11
Tester Connection Switch Condition Specified Condition
P6-1 - Ground part Released Below 1
P6-1 - Ground part Pushed in 10 k or higher
REPLACE PARKING BRAKE SWITCH
5CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH)
G026243E04
Tester Connection Specified Condition
S3-28 (PKB) - P6-1 (PKB) Below 1
Tester Connection Specified Condition
S3-28 (PKB) - Body ground 10 k
or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR

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–160BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(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) Check if the skid control ECU connector is securely
connected.
OK:
The connector is securely connected.
NG
OK
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
NG
OK
1CHECK CAN COMMUNICATION SYSTEM
Result Proceed to
CAN communication system DTC is not output A
CAN communication system DTC is outputB
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 IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
CONNECT CONNECTOR TO ECU
CORRECTLY
4CHECK BATTERY
CHECK OR REPLACE CHARGING SYSTEM
OR BATTERY

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–161
BC
(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Reconnect the skid control ECU connector.
(b) Perform Active Test of the combination meter (meter
CPU) using the intelligent tester (See page ME-19).
OK:
The TRAC OFF indicator light turns on or off in
accordance with the intelligent tester.
HINT:
If troubleshooting has been carried out according to the
Problem Symptoms Table, refer back to the table and
proceed to the next step before replacing the part (See
page BC-79).
NG
OK
5INSPECT SKID CONTROL ECU (CSW TERMINAL)
C141673E25
Tester Condition Switch Condition Specified Condition
S3-43 (CSW) - Body
groundTraction OFF Switch
OFF (Not pressed)10 k
or higher
Go to step 7
6INSPECT COMBINATION METER ASSEMBLY
REPLACE COMBINATION METER
ASSEMBLY
REPLACE BRAKE ACTUATOR ASSEMBLY

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–163
BC
(a) Measure the resistance according to the value(s) in the
table below.
Standard resistance
HINT:
If troubleshooting has been carried out according to the
Problem Symptoms Table, refer back to the table and
proceed to the next step (See page BC-79).
NG
OK
8CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TRACTION OFF SWITCH)
C159743E01
Tester Connection Condition Specified Condition
S3-43 (CSW) - T5-3 (+) Always Below 1
S3-43 (CSW) - Body
groundAlways 10 k or higher
T5-4 (E) - Body ground Always Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE BRAKE ACTUATOR ASSEMBLY