VSC OFF Switch Circuit [03/2023 - ]: Procedure

1. Check that the indicator light and mode condition on the GTS change according to VSC OFF switch (electric parking brake switch assembly) operation.

   Chassis > Brake/EPB > 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/EPB > Data List 

   Tester Display
   TRC (TRAC)/VSC OFF Mode

   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 (electric parking brake switch assembly)	TRC (TRAC) OFF mode (TRC (TRAC) OFF/VSC ON)	Displayed	Does not come on
   Pressing and holding the VSC OFF switch (electric parking brake switch assembly)	VSC OFF mode (TRC (TRAC) OFF/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 [03/2023 - ] 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2022 - ] 

Result: 

A 

See step  2

1. Turn the ignition switch off.
2. Inspect the VSC OFF switch (electric parking brake switch assembly).

   Refer to PROCEDURE - Step 1

   OK

   The VSC OFF switch (electric parking brake switch assembly) is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY. Refer to  REMOVAL [12/2022 - ] 

Result: 

OK 

See step  3

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 A4 No. 2 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

   FOR HEV MODEL
   
   

   Tester Connection	Condition	Specified Condition
   A4-9 (CSW) - K22-3 (+)	Always	Below 1 Ω
   A4-9 (CSW) or K22-3 (+) - Body ground	Always	10 kΩ or higher
   K22-7 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

   FOR PHEV MODEL
   
   

   Tester Connection	Condition	Specified Condition
   A4-9 (CSW) - K22-13 (+)	Always	Below 1 Ω
   A4-9 (CSW) or K22-13 (+) - Body ground	Always	10 kΩ or higher
   K22-7 (E) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [03/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR