Lexus NX: VSC OFF Switch Circuit

DESCRIPTION

The skid control ECU 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 message will be displayed on the multi-information display and the VSC OFF indicator light will come on.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.

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 SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU assembly (brake booster with master cylinder assembly) connector is securely connected.

OK:

The connector is securely connected.

NG

CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY

OK

3.

READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Data List

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

VSC OFF: VSC off mode

Unknown: Unspecified

Chassis > ABS/VSC/TRAC > Data List

Tester Display

TRAC/VSC Off Mode

(d) Check the indicator light and mode condition on the Techstream changes according to VSC OFF switch (integration control and panel assembly) operation.

Standard:

Switch Operation

Mode Condition Display

Multi-information Display (TRAC OFF 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

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

INSPECT METER / GAUGE SYSTEM

C

USE SIMULATION METHOD TO CHECK

A

4.

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

(a) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

TRC(TRAC) OFF Indicator Light

Multi-information display (TRAC OFF message)

Display ON/OFF

Observe combination meter assembly

VSC OFF Indicator Light

VSC OFF indicator light

Indicator light ON/OFF

Observe combination meter assembly

Chassis > ABS/VSC/TRAC > Active Test

Tester Display

TRC(TRAC) OFF Indicator Light

Chassis > ABS/VSC/TRAC > Active Test

Tester Display

VSC OFF Indicator Light

(b) Check the multi-information display (TRAC OFF message) and VSC OFF indicator light on the combination meter assembly turns ON or OFF in accordance with the Techstream operation.

OK:

The multi-information display (TRAC OFF message) and VSC OFF indicator light turns ON or OFF in accordance with the Techstream operation.

NG

GO TO STEP 7

OK

5.

INSPECT INTEGRATION CONTROL AND PANEL ASSEMBLY

(a) Turn the power switch off.

(b) Remove the VSC OFF switch (integration control and panel assembly).

Click here

(c) Inspect the VSC OFF switch (integration control and panel assembly).

Click here

OK:

The VSC OFF switch (integration control and panel assembly) operates normally.

NG

REPLACE INTEGRATION CONTROL AND PANEL ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - INTEGRATION CONTROL AND PANEL ASSEMBLY)

(a) Disconnect the A57 skid control ECU (brake booster with master cylinder assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A57-8 (CSW) - I66-4 (+)

Always

Below 1 Ω

A57-8 (CSW) or I66-4 (+) - Body ground

Always

10 kΩ or higher

I66-1 (GND) - 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.

Click here

OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.

INSPECT COMBINATION METER ASSEMBLY

(a) Turn the power switch off.

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

Click here

Body Electrical > Combination Meter > Active Test

Tester Display

Meter Display 1

Body Electrical > Combination Meter > Active Test

Tester Display

Indicat. VSC OFF

(c) Check the combination meter assembly.

OK:

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

OK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

NG

INSPECT METER / GAUGE SYSTEM

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