Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIW7
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: VSC OFF Switch Circuit; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

VSC OFF Switch Circuit

DESCRIPTION

The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.

Pressing the VSC OFF switch turns off TRAC operation, and pressing and holding this switch turns off TRAC and VSC operation. If TRAC and VSC operations are turned off, the "TRAC OFF"*1 or "Traction Control OFF"*2 message will be displayed on the multi-information display and the VSC OFF indicator light will come on.

  • *1: for Multi-information Display (Monochrome Type)
  • *2: for Multi-information Display (Color Type)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output (See page 2016 MY Sienna [12/2015 - 08/2016]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM ).

Result

Result

Proceed to

DTCs are not output.

A

DTCs are output.

B

B

CHECK CAN COMMUNICATION SYSTEM

(See page 2016 MY Sienna [12/2015 - 08/2016]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING )

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) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

TRAC/VSC Off Mode

TRAC/VSC off mode / Normal, TRAC OFF, Unknown or VSC OFF

Normal: Normal mode

TRAC OFF: TRAC off mode

Unknown: Unspecified

VSC OFF: VSC off mode

-

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

Standard

Switch Operation

Mode Condition Display

Multi-information Display ("TRAC OFF"*1 or "Traction Control OFF"*2 message)

VSC OFF Indicator Light

Not pressed

Normal

Not displayed

Does not come on

Pressing the VSC OFF switch

TRAC OFF

Displayed

Does not come on

Pressing and holding the VSC OFF switch

VSC OFF

Displayed

Comes on

  • *1: for Multi-information Display (Monochrome Type)
  • *2: for Multi-information Display (Color Type)

Result

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 is normal

C

B

CHECK METER / GAUGE SYSTEM

C

USE SIMULATION METHOD TO CHECK

(See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING )

A

4.

PERFORM ACTIVE TEST USING (MULTI-INFORMATION DISPLAY (TRAC OFF MESSAGE) AND VSC OFF INDICATOR LIGHT)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

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

(e) According to the display on the Techstream, read the Data List.

ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

TRC(TRAC) OFF Indicator Light

Multi-information display ("TRAC OFF"*1 or "Traction Control OFF"*2 message)

Display (message) ON/OFF

Observe combination meter

VSC OFF Indicator Light

VSC OFF indicator light

Indicator light ON/OFF

Observe combination meter

(f) Check the multi-information display ("TRAC OFF"*1 or "Traction Control OFF"*2 message) and VSC OFF indicator light in the combination meter assembly turn on or off in accordance with Techstream operation.

OK:

The multi-information display ("TRAC OFF"*1 or "Traction Control OFF"*2 message) and VSC OFF indicator light turn on or off in accordance with Techstream operation.

  • *1: for Multi-information Display (Monochrome Type)
  • *2: for Multi-information Display (Color Type)
NG

GO TO STEP 7

OK

5.

INSPECT VSC OFF SWITCH

(a) Remove the VSC OFF switch (See page 2016 - 2020 MY Sienna [12/2015 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: REMOVAL ).

(b) Inspect the VSC OFF switch (See page 2016 - 2020 MY Sienna [12/2015 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: INSPECTION ).

NG

REPLACE VSC OFF SWITCH

OK

6.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - VSC OFF SWITCH)

(a) Disconnect the A4 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A4-30 (CSW) - D142-6 (+)

Always

Below 1 Ω

A4-30 (CSW) or D142-6 (+) - Body ground

Always

10 kΩ or higher

D142-3 (E) - Body ground

Always

Below 1 Ω

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page 2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 MY Sienna [08/2016 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

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

(c) Check the combination meter assembly.

OK:

The multi-information display and VSC OFF indicator light turn on or off in accordance with Techstream operation.

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts (See page 2016 MY Sienna [12/2015 - 08/2016]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE 2017 MY Sienna [08/2016 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: PROBLEM SYMPTOMS TABLE ).

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

CHECK METER / GAUGE SYSTEM