Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000260SP
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): VSC OFF Switch Circuit; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 -        ]

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 indicator light and the VSC OFF indicator light will come on.

WIRING DIAGRAM

PROCEDURE

1.

READ VALUE USING GTS (TRAC/VSC OFF MODE)

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

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) / 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): TRAC off mode

VSC expert mode (VSC expert mode MID ON): VSC expert mode

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

-

Chassis > Brake/EPB > Data List

Tester Display

TRC(TRAC)/VSC OFF Mode

Standard:

Switch Operation

Mode Condition Display

TRAC OFF Indicator Light

VSC OFF Indicator Light

Not pressed

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

Does not come on

Does not come on

Pressing the VSC OFF switch (combination switch assembly)

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

Comes on

Does not come on

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

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

Comes 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 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM (for 12.3 Inch Display): HOW TO PROCEED WITH TROUBLESHOOTING

C

USE SIMULATION METHOD TO CHECK

A

2.

INSPECT COMBINATION SWITCH ASSEMBLY

(a) Turn the ignition switch off.

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

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: INSPECTION

OK:

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

NG

REPLACE COMBINATION SWITCH ASSEMBLY 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VSC OFF SWITCH: REMOVAL

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 A140 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

A140-9 (CSW) - I177-8 (+)

Always

Below 1 Ω

A140-9 (CSW) or I177-8 (+) - Body ground

Always

10 kΩ or higher

I177-5 (E) - Body ground

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

Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR (for Gasoline Model): REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR