Toyota Tundra Service Manual: VSC OFF Switch Circuit

DESCRIPTION

For 2WD vehicles and 4WD vehicles in 2H mode:

  • When the VSC OFF switch (traction control switch) is pressed for a short amount of time (approximately 1 second), the AUTO LSD indicator light illuminates.
  • When the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more, the AUTO LSD indicator light and VSC OFF indicator light illuminate.
  • When in AUTO LSD mode, the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more, the VSC and TRAC functions turn off, the AUTO LSD indicator light turns off and the TRAC OFF indicator light and VSC OFF indicator light illuminate.

4WD vehicles in 4H mode:

  • When in 4H mode, the TRAC OFF and VSC OFF indicator light turn off.
  • When the VSC OFF switch (traction control switch) is pressed for a short amount of time (approximately 1 second), the TRAC function turns off and the TRAC OFF indicator light illuminates.
  • When the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more with the TRAC OFF function turned off, the VSC and TRAC functions turn off, and the TRAC OFF indicator light and VSC OFF indicator light illuminate.

4WD Vehicles in 4L mode:

  • When the vehicle is in 4L mode, the TRAC OFF and AUTO LSD indicator lights turn off and the VSC OFF indicator light illuminates.When the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more, the VSC and TRAC functions turn off and the TRAC OFF indicator light and VSC OFF indicator light illuminate.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform system variant learning and acceleration sensor zero point calibration.

Click here

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output.

Click here

Result

Proceed to

DTCs are not output

A

DTCs are output

B

B

INSPECT CAN COMMUNICATION SYSTEM

A

2.

CHECK IF BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.

OK:

The connector is securely connected.

NG

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

OK

3.

READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE)

(a) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

TRAC/VSC Off Mode

TRAC/VSC off mode

Normal, TRC OFF or VSC OFF

Normal: Normal mode

TRC OFF: TRAC off mode

VSC OFF: VSC off mode

-

(b) for 4WD vehicles:

Set to H2 mode.

(c) Check the indicator light and mode condition on the Techstream changes according to VSC OFF switch (traction control switch) operation.

Standard:

Switch Operation

Control Mode

Mode Condition Display of Techstream

TRAC OFF Indicator Light

AUTO LSD Indicator Light

VSC OFF Indicator Light

Not pressed

Normal mode

Normal

Does not come on

Does not come on

Does not come on

VSC OFF switch (traction control switch) is pressed for a short amount of time

TRAC OFF mode

TRAC OFF

Does not come on

Comes on

Does not come on

the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more

AUTO LSD mode

Normal

Does not come on

Comes on

Comes on

While the AUTO LSD function is operating, the vehicle is stopped and the VSC OFF switch (traction control switch) is pressed for 3 seconds or more

VSC OFF mode

VSC OFF

Comes on

Does not come on

Comes on

Result

Proceed to

Indicator light and mode condition display do not change

A

Mode condition display is normal, but indicator light does not change

B

Indicator light and mode condition display are normal

C

B

INSPECT METER / GAUGE SYSTEM

C

USE SIMULATION METHOD TO CHECK

A

4.

PERFORM ACTIVE TEST USING TECHSTREAM (TRAC OFF AND VSC OFF INDICATOR LIGHTS)

(a) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test.

ABS/VSC/TRAC

Tester Display

Measurement Item

Control Range

Diagnostic Note

TRC(TRAC) OFF Indicator Light

TRAC OFF indicator light

Indicator light OFF/ON

Observe combination meter assembly

VSC OFF Indicator Light

VSC OFF indicator light

Indicator light OFF/ON

Observe combination meter assembly

(b) Check that the TRAC OFF and VSC OFF indicator lights on the combination meter assembly turn on or off in accordance with the operation of the Techstream.

OK:

The TRAC OFF and VSC OFF indicator lights turn on or off in accordance with the operation of the Techstream.

NG

GO TO STEP 7

OK

5.

INSPECT TRACTION CONTROL SWITCH

(a) Turn the ignition switch off.

(b) Remove the VSC OFF switch (traction control switch).

Click here

NG

REPLACE TRACTION CONTROL SWITCH

OK

6.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - TRACTION CONTROL SWITCH)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

(b) Disconnect the A57 skid control ECU (brake actuator assembly) connector.

(c) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A57-20 (CSW) - J22-9

Always

Below 1 Ω

A57-20 (CSW) or J22-9 - Body ground

Always

10 kΩ or higher

J22-6 - Body ground

Always

Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT COMBINATION METER ASSEMBLY

(a) Enter the following menus: Body Electrical / Combination Meter / Active Test.

Click here

(b) Perform the Active Test of the combination meter assembly using the Techstream.

(c) Check the combination meter assembly.

OK:

The TRAC OFF, VSC OFF and AUTO LSD indicator light turn on or off in accordance with the Techstream operation.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

INSPECT METER / GAUGE SYSTEM

    VSC does not Operate or VSC does not Operate Correctly

    Vsc Off Switch

    See More:

    Toyota Tundra Service Manual > Dynamic Radar Cruise Control System: Diagnostic Trouble Code Chart
    DIAGNOSTIC TROUBLE CODE CHART Dynamic Radar Cruise Control System DTC No. Detection Item Link C1A02 Vehicle Information Not Obtained C1A10 Front Radar Sensor C1A11 Front Radar Sensor Incorrect Axial Gap C1A14 Front Radar Sensor Beam Axis Not Adjusted C1A4A Skid Control Buzzer Circuit C1A52 Radar Cru ...

    Toyota Tundra Owners Manual

    Toyota Tundra Service Manual

    © 2021 Copyright www.ttundra.com
    0.0198