VSC OFF Switch Circuit [04/2018 - 08/2021]: Procedure

1. Check if CAN communication system DTCs are output.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -]

   Result

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

Result: 

B 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

Result: 

A 

See step  2

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

   OK

   The connector is securely connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTOR TO BRAKE ACTUATOR ASSEMBLY CORRECTLY 

Result: 

OK 

See step  3

1. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Data List.

   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 Expert Mode: VSC expert mode VSC OFF: VSC off mode	-

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

   Tester Display
   TRAC/VSC Off Mode

2. 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	Not displayed	Does not come on
   Pressing the VSC OFF switch	TRAC OFF	Displayed	Does not come on
   Pressing and holding the VSC OFF switch	VSC OFF	Displayed	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

Result: 

B 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

Result: 

A 

See step  4

1. Enter the following menus: Chassis / ABS/VSC/TRAC/EPB / Active Test.

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

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   TRC(TRAC) OFF Indicator Light	Multi-information display (Traction Control Turned Off)	Display OFF/ON	Observe combination meter assembly
   VSC OFF Indicator Light	VSC OFF indicator light	Indicator light OFF/ON	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

2. Check that "Traction Control Turned Off" on the multi-information display and the VSC OFF indicator light on the combination meter assembly turn on or off in accordance with the operation of the Techstream.

   OK

   "Traction Control Turned Off" on the multi-information display and the VSC OFF indicator light turn on or off in accordance with the operation of the Techstream.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  5

1. Turn the engine switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (VSC OFF switch)

   OK

   The connector is securely connected.

3. Disconnect the G26 VSC OFF switch connector.
4. Check both the connector case and the terminal for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   5 (+) - 2 (E)	Switch pushed	Below 1 Ω
   5 (+) - 2 (E)	Switch not pushed	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE VSC OFF SWITCH. Refer to  REMOVAL [04/2018 -] 

Result: 

OK 

See step  6

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

   OK

   The connector is securely connected.

2. Disconnect the A28 skid control ECU (brake actuator assembly) connector.
3. Check both the connector case and the terminals for deformation and corrosion.

   OK

   No deformation or corrosion.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A28-6 (CSW) - G26-5 (+)	Always	Below 1 Ω
   A28-6 (CSW) or G26-5 (+) - Body ground	Always	10 kΩ or higher
   G26-2 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Enter the following menus: Body Electrical / Combination Meter / Active Test.
2. Perform the Active Test of the combination meter assembly using the Techstream.

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Multi Display All (White)

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   VSC OFF Indicator

3. Check the combination meter assembly.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -]