Toyota CH-R Service Manual: 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 actuator assembly), perform system variant learning.

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 BRAKE ACTUATOR ASSEMBLY CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU (brake actuator assembly) connector is securely connected.

OK:

The connector is securely connected.

NG

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY

OK

3.	READ VALUE USING TECHSTREAM (TRAC/VSC OFF MODE)

(a) Select the Data List on the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
TRAC/VSC Off Mode	TRAC/VSC off mode	Normal, TRAC OFF, VSC Expert Mode or VSC OFF	Normal: Normal mode TRAC OFF: TRAC off mode VSC OFF: VSC off mode	-

Chassis > ABS/VSC/TRAC/EPB > Data List

Tester Display
TRC/VSC Off Mode

(b) 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 (TRAC OFF message)	VSC OFF Indicator Light
Not pressed	Normal	Not displayed	Does not come on
Pressing the VSC OFF switch (electric parking brake switch assembly)	TRAC OFF	Displayed	Does not come on
Pressing and holding the VSC OFF switch (electric parking brake switch assembly)	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

4.	PERFORM ACTIVE TEST USING TECHSTREAM (TRC (TRAC) OFF INDICATOR LIGHT AND VSC OFF INDICATOR LIGHT)

(a) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
TRC(TRAC) OFF Indicator Light	Multi-information display (TRAC OFF massage)	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/EPB > Active Test

Tester Display
TRC(TRAC) OFF Indicator Light

Chassis > ABS/VSC/TRAC/EPB > 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 turn on or off in accordance with Techstream operation.

OK:

The multi-information display (TRAC OFF message) and VSC OFF indicator light turn on or off in accordance with Techstream operation.

NG

GO TO STEP 7

OK

5.	INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

(a) Inspect the electric parking brake switch assembly.

Click here

NG

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY

OK

6.	CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)

(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 A42 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
A42-6 (CSW) - F67-13 (+)	Always	Below 1 Ω
A42-6 (CSW) or F67-13 (+) - Body ground	Always	10 kΩ or higher
F67-8 (E) - Body ground	Always	Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	INSPECT COMBINATION METER ASSEMBLY

(a) Perform the Active Test of the combination meter assembly 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

(b) Check the combination meter assembly.

OK:

The multi-information display (TRC OFF message) and VSC OFF indicator light turn on or off in accordance with Techstream operation.

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

INSPECT METER / GAUGE SYSTEM