DTC C13B4: EPB Switch Malfunction [02/2017 - ]: Procedure

1. Inspect the electric parking brake switch (electric parking brake switch assembly).

   Refer to INSPECTION [02/2017 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY). Refer to  REMOVAL [02/2017 - ] 

Result: 

OK 

See step  2

1. Disconnect the F67 electric parking brake switch (electric parking brake switch assembly) connector.
2. Disconnect the A42 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A42-31 (SWI1) - F67-6 (SWI1)	Always	Below 5 Ω
   A42-32 (SWO1) - F67-5 (SWO1)	Always	Below 5 Ω
   A42-15 (SWI2) - F67-4 (SWI2)	Always	Below 5 Ω
   A42-16 (SWO2) - F67-3 (SWO2)	Always	Below 5 Ω
   A42-31 (SWI1) or F67-6 (SWI1) - Body ground	Always	10 kΩ or higher
   A42-32 (SWO1) or F67-5 (SWO1) - Body ground	Always	10 kΩ or higher
   A42-15 (SWI2) or F67-4 (SWI2) - Body ground	Always	10 kΩ or higher
   A42-16 (SWO2) or F67-3 (SWO2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [02/2017 - ]

   Chassis > ABS/VSC/TRAC/EPB > Clear DTCs 

2. Turn the ignition switch off.
3. Turn the ignition switch to ON.
4. Check for DTCs.

   Refer to DTC CHECK / CLEAR [02/2017 - ]

   Chassis > ABS/VSC/TRAC/EPB > Trouble Codes 

   Result

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

Result: 

A 

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY). Refer to  REMOVAL [02/2017 - 09/2019]  , or refer to  REMOVAL [09/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - ] 

Result: 

B 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 10/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 05/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ]