Toyota Camry owners & service manuals

Toyota Camry (XV70): 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, "Traction Control Turned Off" 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 acceleration sensor zero point calibration and system information memorization.

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PROCEDURE

1.

READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

Chassis > Brake > 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 > Data List

Tester Display

TRC(TRAC)/VSC OFF Mode

(d) 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 ("Traction Control Turned Off")

VSC OFF Indicator Light

Not pressed

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

Not displayed

Does not come on

Pressing the VSC OFF switch

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

Displayed

Does not come on

Pressing and holding the VSC OFF switch

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 VSC OFF SWITCH

(a) Inspect the VSC OFF switch.

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OK:

The VSC OFF switch is normal.

NG

REPLACE VSC OFF SWITCH

OK

3.

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

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

OK:

The connector is securely connected.

(b) Disconnect the A34 skid control ECU (brake actuator assembly) connector.

(c) Disconnect the K39 VSC OFF switch 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

K39-5 (+) - A34-38 (CSW)

Always

Below 1 Ω

K39-5 (+) or A34-38 (CSW) - Body ground

Always

10 kΩ or higher

K39-2 (E) - 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

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