Toyota Tacoma (2015-2018) Service Manual: VSC OFF Switch Circuit

Toyota Tacoma (2015-2018) Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / 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 indicator and the VSC OFF indicator lights come on.

for 4WD:

When the 4WD control switch (transfer position switch) set to L4, VSC is prohibited and the VSC OFF indicator light turns on.

w/ Rear Differential Lock:

When the rear differential is locked, VSC is prohibited, the VSC OFF indicator turns on and the TRAC OFF message is displayed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration and store system information (See page ).
for 4WD:
As there may be malfunctions in the touch select 2-4 and high-low system related to when the transfer operates in L4, check the touch select 2-4 and high-low system first (See page ).

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check if CAN communication system DTCs are output (See page Result Result ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

CHECK CAN COMMUNICATION SYSTEM

2.	CHECK IF SKID CONTROL ECU ASSEMBLY CONNECTOR IS SECURELY CONNECTED

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

OK:

The connector is securely connected.

Result

Result	Proceed to
OK (w/ Rear Differential Lock)	A
OK (w/o Rear Differential Lock)	B
NG	C

GO TO STEP 4

CONNECT CONNECTOR TO SKID CONTROL ECU ASSEMBLY CORRECTLY

3.	CHECK FOR DIFFERENTIAL SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Four Wheel Drive / Trouble Codes.

(e) Check for DTCs.

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO DIFFERENTIAL SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

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

(a) Reconnect the S1 skid control ECU (brake actuator assembly) connector.

(b) Connect the Techstream to the DLC3.

(d) Select the Data List on the Techstream (See page ABS/VSC/TRAC ).

ABS/VSC/TRAC

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

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

TRC/VSC Off Mode

TRAC/VSC off mode

Normal, TRAC OFF, Unknown or VSC OFF

Normal: Normal mode

TRAC OFF: TRAC off mode

VSC OFF: VSC off mode

Unknown: Unspecified

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

Standard:

Switch Operation	Mode Condition Display	TRAC OFF Indicator Light	VSC OFF Indicator Light
Not pressed	Normal	Not displayed	Does not come on
Pressing the VSC OFF switch	TRAC OFF	Comes on	Does not come on
Pressing and holding the VSC OFF switch	VSC OFF	Comes on	Comes on

Result

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

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

(a) Select the Active Test on the Techstream (See page ABS/VSC/TRAC ).

ABS/VSC/TRAC

Tester Display	Measurement Item	Control Range	Diagnostic Note
TRC(TRAC) OFF Indicator Light	TRAC OFF indicator light	Indicator light ON/OFF	Observe combination meter assembly Vehicle condition: Vehicle stopped
VSC OFF Indicator Light	VSC OFF indicator light	Indicator light ON/OFF	Observe combination meter assembly Vehicle condition: Vehicle stopped

Tester Display

Measurement Item

Control Range

Diagnostic Note

TRC(TRAC) OFF Indicator Light

TRAC OFF indicator light

Indicator light ON/OFF

Observe combination meter assembly

Vehicle condition: Vehicle stopped

VSC OFF Indicator Light

VSC OFF indicator light

Indicator light ON/OFF

Observe combination meter assembly

Vehicle condition: Vehicle stopped

(b) Check the TRAC OFF indicator light and VSC OFF indicator light on the combination meter assembly turn ON or OFF in accordance with the Techstream operation.

OK:

The TRAC OFF indicator light and VSC OFF indicator light turn ON or OFF in accordance with the Techstream operation.

GO TO STEP 9

6.	INSPECT VSC OFF SWITCH

(a) Turn the ignition switch off.

(b) Remove the VSC OFF switch (See page (c) Inspect the VSC OFF switch (See page ). ).

OK:

The VSC OFF switch operates normally.

REPLACE VSC OFF SWITCH

7.	INSPECT ROOF CONSOLE BOX ASSEMBLY

(a) Remove the roof console box assembly.

for Double Cab:
for Access Cab:

Text in Illustration

Component without harness connected

(Roof Console Box Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R44-16 (+) - T17-9 (+)	Always	Below 1 Ω
R44-12 (GND) - T17-6 (E)	Always	Below 1 Ω

Result

Result	Proceed to
OK	A
NG (for Double Cab)	B
NG (for Access Cab)	C

REPLACE ROOF CONSOLE BOX ASSEMBLY

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

(a) Disconnect the S1 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
S1-33 (CSW) - R44-16 (+)	Always	Below 1 Ω
S1-33 (CSW) or R44-16 (+) - Body groundd	Always	10 kΩ or higher
R44-12 (GND) - Body ground	Always	Below 1 Ω

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	INSPECT COMBINATION METER ASSEMBLY

(a) Turn the ignition switch off.

(b) Perform the Active Test of the combination meter assembly using the Techstream (See page (c) Check the combination meter assembly. ).

OK:

The TRAC OFF indicator light turns on or off in accordance with the Techstream.

REPLACE BRAKE ACTUATOR ASSEMBLY

INSPECT METER / GAUGE SYSTEM

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