DTC C0609-62: Electric Parking Brake Switch Signal Compare Failure [09/2022 - ]: Procedure

1. Connect the GTS to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Chassis / Brake/EPB / Data List.

   Chassis > Brake > Data List 

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

   Chassis > Brake > Data List 

   Tester Display
   EPB Switch

4. Operate the electric parking brake switch and check that the value of "EPB Switch" in the Data List changes between Apply and Release in accordance with the operation of the switch.

   OK

   The value of EPB Switch changes between Apply 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 > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Check for DTCs.

   Chassis > Brake > 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 [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

Result: 

B 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

1. Remove the electric parking brake switch assembly.

   Refer to REMOVAL [09/2022 - ]

2. Inspect the electric parking brake switch assembly.

   Refer to INSPECTION [09/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY 

Refer to REMOVAL [09/2022 - ]

Result: 

OK 

See step  5

1. Disconnect the I159 electric parking brake switch assembly connector.
2. Disconnect the A51 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
   A51-31 (SWI1) - I159-7 (SWI1)	Always	Below 1 Ω
   A51-32 (SWO1) - I159-8 (SWO1)	Always	Below 1 Ω
   A51-15 (SWI2) - I159-1 (SWI2)	Always	Below 1 Ω
   A51-16 (SWO2) - I159-2 (SWO2)	Always	Below 1 Ω
   A51-31 (SWI1) or I159-7 (SWI1) - Body ground	Always	10 kΩ or higher
   A51-32 (SWO1) or I159-8 (SWO1) - Body ground	Always	10 kΩ or higher
   A51-15 (SWI2) or I159-1 (SWI2) - Body ground	Always	10 kΩ or higher
   A51-16 (SWO2) or I159-2 (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 > Clear DTCs 

2. Turn the power switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Check for DTCs.

   Chassis > Brake > 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 [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - 09/2024] , or refer to REMOVAL [09/2024 - ]

Result: 

B 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]