DTC C124A-05: ECM Communication System Programming Failure [11/2021 - 10/2023]: Procedure

1. Check that the proper hybrid vehicle control ECU assembly is installed.

   OK

   Proper hybrid vehicle control ECU assembly is installed.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

OK 

See step  2

1. Check that the proper brake actuator assembly is installed.

   OK

   Proper brake actuator assembly is installed.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

OK 

See step  3

1. Perform system information memorization.

   Refer to UTILITY [11/2021 - 10/2023]

   Chassis > Brake/EPB > Utility 

   Tester Display
   Reset Memory

   Chassis > Brake/EPB > Utility 

   Tester Display
   Calibration

   HINT: 

   After performing "Reset Memory" using the GTS to clear the memorized value of the No. 2 skid control ECU (brake actuator assembly), DTC C124A-05 will be stored until system information memorization is performed.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Clear the DTCs.

   Chassis > Brake/EPB > Clear DTCs 

2. Turn the ignition switch off.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
2. Check if the same DTC is output.

   Chassis > Brake/EPB > Trouble Codes 

   Result

   Result	Proceed to
   DTC C124A-05 is not output.	A
   DTC C124A-05 is output.	B

Result: 

A 

END 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]