DTC C0609-62: Electric Parking Brake Switch Signal Compare Failure [11/2022 - ]: Procedure

1. Operate the electric parking brake switch (electric parking brake switch assembly) and check that the value of "EPB Switch" in the Data List changes between Lock and Release in accordance with the operation of the switch.

   Chassis > Brake/EPB > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   EPB Switch	Electric parking brake switch (electric parking brake switch assembly) input	OFF / Lock / Release / Unknown	OFF: Lock switch and release switch are off Lock: Lock switch on Release: Release switch on	When not normal, electric parking brake switch (electric parking brake switch assembly) release side system may be malfunctioning HINT:  EPB stands for electric parking brake.

   Chassis > Brake/EPB > Data List 

   Tester Display
   EPB Switch

2. Check the mode condition on the GTS changes according to electric parking brake switch (electric parking brake switch assembly) operation.

   OK

   The value of EPB Switch changes between Lock and Release in accordance with switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Clear the DTCs.

   Chassis > Brake/EPB > Clear DTCs 

2. Turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Chassis > Brake/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 [11/2022 - ] 

Result: 

B 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ] 

Refer to INSPECTION [09/2021 - ]

Result

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY). Refer to  REMOVAL [11/2022 - ] 

Result: 

OK 

See step  5

1. Disconnect the I257 electric parking brake switch (electric parking brake switch assembly) connector.
2. Disconnect the A151 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A151-31 (SWI1) - I257-7 (SWI1)	Always	Below 1 Ω
   A151-32 (SWO1) - I257-8 (SWO1)	Always	Below 1 Ω
   A151-15 (SWI2) - I257-1 (SWI2)	Always	Below 1 Ω
   A151-16 (SWO2) - I257-2 (SWO2)	Always	Below 1 Ω
   A151-31 (SWI1) or I257-7 (SWI1) - Body ground	Always	10 kΩ or higher
   A151-32 (SWO1) or I257-8 (SWO1) - Body ground	Always	10 kΩ or higher
   A151-15 (SWI2) or I257-1 (SWI2) - Body ground	Always	10 kΩ or higher
   A151-16 (SWO2) or I257-2 (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  6

1. Clear the DTCs.

   Chassis > Brake/EPB > Clear DTCs 

2. Turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Check for DTCs.

   Chassis > Brake/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 [11/2022 - ] 

Result: 

B 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ]