Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: VSC OFF Switch Circuit

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / 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 (combination switch assembly) 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:

After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE)

(a) Connect the Techstream to the DLC3.

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

(c) Enter the following menus: Chassis / Brake/EPB / Data List.

Chassis > Brake/EPB > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

TRC(TRAC)/VSC OFF Mode

TRAC/VSC off mode

Normal mode (TRC(TRAC) ON/VSC ON) / TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON) / Not defined / VSC OFF mode (TRC(TRAC) OFF/VSC OFF)

Normal mode (TRC(TRAC) ON/VSC ON): Normal mode

TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON): TRAC off mode

Not defined: Not defined

VSC OFF mode (TRC(TRAC) OFF/VSC OFF): VSC off mode

-
Chassis > Brake/EPB > Data List

Tester Display

TRC(TRAC)/VSC OFF Mode

(d) Check that the indicator light and mode condition on the Techstream change according to VSC OFF switch (combination switch assembly) operation.

Standard:

Switch Operation

Mode Condition Display

Multi-information Display (TRAC OFF Message)

VSC OFF Indicator Light

Not pressed

Normal mode (TRC(TRAC) ON/VSC ON)

Not displayed

Does not come on

Pressing the VSC OFF switch (combination switch assembly)

TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON)

Displayed

Does not come on

Pressing and holding the VSC OFF switch (combination switch assembly)

VSC OFF mode (TRC(TRAC) OFF/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 are normal.

C
B

INSPECT METER / GAUGE SYSTEM

C

USE SIMULATION METHOD TO CHECK

A

2.

INSPECT COMBINATION SWITCH ASSEMBLY

(a) Turn the engine switch off.

*a

Component without harness connected

(VSC OFF Switch (Combination Switch Assembly))

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

OK:

The connector is securely connected.

(c) Disconnect the J35 VSC OFF switch (combination switch assembly) connector.

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

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4 (+) - 1 (GND)

Switch pushed

Below 1 Ω

4 (+) - 1 (GND)

Switch not pushed

10 kΩ or higher
NG

REPLACE COMBINATION SWITCH ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - COMBINATION SWITCH ASSEMBLY)

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

OK:

The connector is securely connected.

(b) Disconnect the A41 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

A41-9 (CSW) - J35-4 (+)

Always

Below 1 Ω

A41-9 (CSW) or J35-4 (+) - Body ground

Always

10 kΩ or higher

J35-1 (GND) - Body ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Brake Actuator Operation Sound is Loud during Initial Check
    CAUTION / NOTICE / HINT NOTICE: After replacing the skid control ECU (brake actuator assembly), perform "Calibration". Click here PROCEDURE 1. PERFORM ROAD TEST (a) After turning the engine ...

    Vsc Off Switch
    ...

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