Page 2505 of 3000
BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–143
BC
DESCRIPTION
If any of the following is detected, the ABS warning light remains on.
• The skid control ECU connectors are disconnected from the skid control ECU.
• There is a malfunction in the skid control ECU internal circuit.
• There is an open in the harness between the combination meter and the skid control ECU.
HINT:
In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.
WIRING DIAGRAM
ABS Warning Light Remains ON
C160965E03
Page 2506 of 3000

BC–144BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
INSPECTION PROCEDURE
(a) Is DTC output for ABS?
Result
B
A
(a) Check the ECU connector's connecting condition.
OK:
The connector should be securely connected.
NG
OK
(a) Check the battery voltage.
Standard voltage:
11 to 14 V
NG
OK
(a) WHEN USING INTELLIGENT TESTER:
(1) Connect the intelligent tester to the DLC3.
(2) Start the engine.
(3) Select the DATA LIST mode on the intelligent tester.
ABS / VSC:
(4) Read the voltage condition output from the ECU
displayed on the intelligent tester.
OK:
"Normal" is displayed.
(b) WHEN NOT USING INTELLIGENT TESTER:
1CHECK DTC
Result Proceed to
DTC is not outputA
DTC is outputB
REPAIR CIRCUITS INDICATED BY OUTPUT
DTCS
2CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED
CONNECT CONNECTOR TO ECU
CORRECTLY
3CHECK BATTERY
CHECK OR REPLACE CHARGING SYSTEM
OR BATTERY
4INSPECT SKID CONTROL ECU (IG1 TERMINAL)
Tester Display Measurement Item/Range Normal Condition
IG VOLTAGEECU power supply voltage / UNDER /
NORMALNORMAL: 9.5 V or over
UNDER: Below 9.5 V
Page 2507 of 3000

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–145
BC
(1) Disconnect the skid control ECU connector.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) WHEN USING INTELLIGENT TESTER:
(1) Connect the intelligent tester to the DLC3 and start
the engine.
(2) Select the item "ABS WARN LIGHT" in the ACTIVE
TEST and operate the ABS warning light on the
intelligent tester.
(3) Check that "ON" and "OFF" of the ABS warning light
can be shown on the combination meter by the
intelligent tester.
(b) WHEN NOT USING INTELLIGENT TESTER:
(1) Turn the ignition switch off and disconnect the
connector from the skid control ECU.
(2) Ground the terminal WA of the skid control ECU.
(3) Turn the ignition switch to the ON position.
(4) Check that the ABS warning light goes off.
OK
NG
(a) Disconnect the skid control ECU connector.
G024767E47
Tester Connection Specified Condition
S3-46 (IG1) - S3-32 (GND1) 10 to 14 V
S3-46 (IG1) - S3-1 (GND2) 10 to 14 V
Go to step 6
5CHECK ABS WARNING LIGHT
G024767E48
REPAIR OR REPLACE ABS WARNING LIGHT
CIRCUIT
REPLACE BRAKE ACTUATOR ASSEMBLY
6CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND)
Page 2508 of 3000
BC–146BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NOTICE:
When replacing brake actuator assembly, perform
zero point calibration (See page BC-70).
NG
OK
G024767E49
Tester Connection Specified Condition
S3-1 (GND2) - Body ground Below 1
S3-32 (GND1) - Body ground Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR
REPLACE BRAKE ACTUATOR ASSEMBLY
Page 2509 of 3000
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)
Page 2510 of 3000
BC–148BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Check the combination meter (See page ME-4).
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
C127580E02
Tester Connection Specified Condition
S3-29 (WA) - C10-7 Below 1
S3-29 (WA) - Body ground 10 k or higher
REPAIR OR REPLACE HARNESS OR
CONNECTOR
3INSPECT COMBINATION METER ASSEMBLY
REPLACE COMBINATION METER
ASSEMBLY
END
Page 2511 of 3000
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
Page 2512 of 3000
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