VSC OFF Switch Circuit [11/2017 - 03/2019]: Procedure

1. Check if CAN communication system DTCs are output.

   Refer to DIAGNOSIS SYSTEM [11/2017 - 03/2019]

   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 [11/2017 - 03/2019] 

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. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Data List using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [11/2017 - 03/2019]

   Chassis > ABS/VSC/TRAC > Data List 

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

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   TRAC/VSC Off Mode

4. Check the indicator light and mode condition on the Techstream changes according to VSC OFF switch (combination switch assembly) operation.

   Standard

   Switch Operation	Mode Condition Display	TRAC OFF Indicator Light	VSC OFF Indicator Light
   Not pressed	Normal	Does not come on	Does not come on
   Pressing the VSC OFF switch (combination switch assembly)	TRAC OFF	Comes on	Does not come on
   Pressing and holding the VSC OFF switch (combination switch assembly)	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 is normal.	C

Result: 

B 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ] 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019] 

Result: 

A 

See step  4

1. Select the Active Test on the Techstream.

   Refer to DATA LIST / ACTIVE TEST [11/2017 - 03/2019]

   Chassis > ABS/VSC/TRAC > Active Test 

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

   Chassis > ABS/VSC/TRAC > Active Test 

   Tester Display
   TRC(TRAC) OFF Indicator Light

   Chassis > ABS/VSC/TRAC > Active Test 

   Tester Display
   VSC OFF Indicator Light

2. Check the TRAC OFF indicator light and VSC OFF indicator light on the combination meter assembly turns ON or OFF in accordance with Techstream operation.

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  7

Result: 

OK 

See step  5

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (VSC OFF Switch (Combination Switch Assembly))

2. Disconnect the O78 VSC OFF switch (combination switch assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 (+) - 16 (E)	Switch pushed	Below 50 Ω
   1 (+) - 16 (E)	Switch not pushed	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE COMBINATION SWITCH ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  6

1. Disconnect the A86 skid control ECU (brake actuator assembly) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A86-33 (CSW) - O78-1 (+)	Always	Below 1 Ω
   A86-33 (CSW) or O78-1 (+) - Body ground	Always	10 kΩ or higher
   O78-16 (E) - Body ground	Always	Below 1 Ω

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

   Refer to PROBLEM SYMPTOMS TABLE [11/2017 - 03/2019]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2017 - 01/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Turn the engine switch off.
2. Perform an Active Test of the combination meter assembly using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [11/2017 - 03/2019]

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   VSC TRC Indicator

   Body Electrical > Combination Meter > Active Test 

   Tester Display
   Indicat. VSC OFF

3. Check the combination meter assembly.

   OK

   The TRAC OFF indicator light and VSC OFF indicator light turns on or off in accordance with Techstream operation.

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.

   Refer to PROBLEM SYMPTOMS TABLE [11/2017 - 03/2019]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2017 - 01/2023] 

Result: 

NG 

INSPECT METER / GAUGE SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - ]