Toyota Tundra. Manual — part 954

B: GO TO CAN COMMUNICATION SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: Go To Next Step

2. INSPECT CONNECTOR CONNECTION CONDITION

a. Check the skid control ECU connector connection condition.

OK: The connector is securely connected.

NG: CONNECT CONNECTOR CORRECTLY

OK: Go To Next Step

3. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY

GROUND)

a. Disconnect the A17 ECU connector.

b. Measure the voltage and resistance according to the value (s) in the table below.

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION TABLE

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

DTC is not output

A

DTC is output

B

Tester Connection

Switch Condition

Specified Condition

A17-9 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Tester Connection

Condition

Specified Condition

A17-1 (GND1) - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 111: Identifying A17 ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go To Next Step

4. PERFORM ACTIVE TEST USING TECHSTREAM (AUTO LSD INDICATOR LIGHT)

a. Connect the Techstream to the DLC3.

b. Turn the ignition switch to ON.

c. Turn the Techstream on.

d. Select the Active Test mode and operate the AUTO LSD indicator light using the Techstream.

ABS/VSC/TRAC

DIAGNOSTIC NOTE TABLE

e. Check that the AUTO LSD indicator light turns on and off in the combination meter when using

the Techstream.

OK: The AUTO LSD indicator light turns on and off in accordance with the Techstream
operation.

NG: GO TO METER/GAUGE SYSTEM (See HOW TO PROCEED WITH
TROUBLESHOOTING )

OK: Go To Next Step

Tester Display

Test Part

Control Range

Diagnostic Note

Auto LSD Indicator

Light

AUTO LSD indicator

light

ON/OFF

Observe combination

meter

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

5. INSPECT VSC OFF SWITCH

a. Remove the VSC OFF switch (See REMOVAL ).

b. Measure the resistance according to the value (s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Fig. 112: Identifying VSC Off Switch Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE VSC OFF SWITCH

OK: Go To Next Step

6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - VSC OFF SWITCH AND

BODY GROUND)

a. Disconnect the A17 ECU connector.

b. Disconnect the J22 switch connector.

c. Measure the resistance according to the value (s) in the table below.

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION TABLE

Tester Connection

Switch Condition

Specified Condition

6-9

Switch is pressed

Below 1 ohms

Switch is not pressed

10 kohms or higher

Tester Connection

Condition

Specified Condition

A17-13 (CSW) - J22-9

Always

Below 1 ohms

A17-13 (CSW) - Body ground

Always

10 kohms or higher

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 113: Identifying A17 ECU Connector And J22 Switch Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE VSC ACTUATOR ASSEMBLY (See REMOVAL )

SKID CONTROL BUZZER CIRCUIT

DESCRIPTION

During VSC operation, the skid control buzzer sounds.

When performing a sensor check in test mode, the buzzer sounds when some of the sensor checks are
completed. When a brake pad is overheated, the buzzer sounds as a warning.

WIRING DIAGRAM

J22-6 - Body ground

Always

Below 1 ohms

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra