Toyota Yaris: Vehicle Stability Control System / VSC OFF Switch Circuit

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / VSC OFF Switch Circuit

DESCRIPTION

Operating the VSC OFF switch (combination switch assembly) makes it possible for TRC and/or VSC operation to be prohibited.

Pressing the VSC OFF switch (combination switch assembly) changes to TRC OFF mode, and turns off TRC operation. In addition, a TRC cancel message is displayed on the multi-information display in the combination meter assembly.

While the vehicle is stopped, pressing and holding the VSC OFF switch (combination switch assembly) for 3 seconds or more changes to VSC OFF mode, and turns off both TRC and VSC operation. In addition, a TRC cancel message is displayed on the multi-information display in the combination meter assembly, and the VSC OFF indicator light illuminates.

If the VSC OFF switch is pressed while SPORT or TRACK modes are selected, the mode changes to EXPERT mode, in which control is performed to help prevent the vehicle from spinning during oversteer maneuvers. In addition, the VSC OFF indicator light in the combination meter assembly illuminates, and "EXPERT" is displayed on the multi-information display.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

Click here

PROCEDURE

1.	READ VALUE USING GTS (TRC (TRAC)/VSC OFF MODE)

(a) Operate the GTS to check the Data List.

Chassis > Brake > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
TRC(TRAC)/VSC OFF Mode	TRC/VSC off mode	Normal mode (TRC(TRAC) ON/VSC ON) / TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON) / VSC expert mode(VSC expert mode MID ON) / 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): TRC off mode VSC expert mode(VSC expert mode MID ON): When TRC and VSC are prohibited during SPORT mode or TRACK mode VSC OFF mode (TRC(TRAC) OFF/VSC OFF): VSC off mode	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

TRC(TRAC)/VSC OFF Mode

TRC/VSC off mode

Normal mode (TRC(TRAC) ON/VSC ON) / TRC(TRAC) OFF mode (TRC(TRAC) OFF/VSC ON) / VSC expert mode(VSC expert mode MID ON) / 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): TRC off mode

VSC expert mode(VSC expert mode MID ON): When TRC and VSC are prohibited during SPORT mode or TRACK mode

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

Chassis > Brake > Data List

Tester Display
TRC(TRAC)/VSC OFF Mode

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

Standard:

Switch Operation	Mode Condition Display	Multi-information Display (TRC 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

INSPECT METER / GAUGE SYSTEM

USE SIMULATION METHOD TO CHECK

2.	INSPECT COMBINATION SWITCH ASSEMBLY

(a) Turn the ignition switch off.

(b) Inspect the VSC OFF switch (combination switch assembly).

Click here

OK:

The VSC OFF switch (combination switch assembly) is normal.

REPLACE COMBINATION SWITCH ASSEMBLY

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 A108 skid control ECU (brake actuator assembly) connector.

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
H18-7 (+) - A108-33 (CSW)	Always	Below 1 Ω
H18-7 (+) or A108-33 (CSW) - Body ground	Always	10 kΩ or higher
H18-5 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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