Toyota Tundra. Manual — part 953

Fig. 108: Identifying Auto LSD Indicator Light Remains On - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

a. Check if a CAN communication system DTC is output (See DIAGNOSTIC TROUBLE CODE

TABLE ).

Result

RESULT TABLE

NOTE:

When replacing the VSC actuator assembly, perform zero point calibration (See
CALIBRATION ).

Result

Proceed to

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

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

A: Go To Next Step

2. 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.

HINT:

When the AUTO LSD indicator light remains illuminated, there may be an open in the wire harness
of the combination meter or abnormalities in the meter circuit.

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

OK: Go To Next Step

3. 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

DTC is not output

A

DTC is output

B

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

Fig. 109: Identifying VSC Off Switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE VSC OFF SWITCH (See REMOVAL )

OK: Go To Next Step

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

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. 110: Identifying A17 ECU Connector & 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 )

AUTO LSD INDICATOR LIGHT DOES NOT COME ON

WIRING DIAGRAM

Refer to AUTO LSD INDICATOR LIGHT REMAINS ON .

INSPECTION PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

a. Check if a CAN communication system DTC is output (See DIAGNOSTIC TROUBLE CODE

TABLE ).

Result

RESULT TABLE

NOTE:

When replacing the VSC actuator assembly, perform zero point calibration (See
CALIBRATION ).

Result

Proceed to

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra