PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A50

DTC Code DTC Name
C1A50 Brake System Malfunction

DESCRIPTION

When the pre-crash safety system is operating, the driving support ECU assembly sends brake control signals to the skid control ECU assembly.

When the driving support ECU assembly receives a electronically controlled brake system malfunction signal from the skid control ECU assembly via CAN communication, DTC C1A50 is stored.

DTC Code DTC Detection Condition Trouble Area
C1A50 While the power switch is on (IG), the driving support ECU assembly receives a electronically controlled brake system malfunction signal from the skid control ECU assembly for 0.3 seconds or more.

  • Electronically controlled brake system

  • Skid control ECU assembly

  • Driving support ECU assembly

CAUTION / NOTICE / HINT

Note


  • When replacing the driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly which was installed to another vehicle is used, the information stored in the driving support ECU assembly will not match the information from the vehicle. As a result, a DTC may be stored.

  • The pre-crash safety system uses the CAN communication system. First, confirm that there are no malfunction in the CAN communication system. Refer to How to Proceed with Troubleshooting.


PROCEDURE


  1. CHECK FOR DTCs (ELECTRONICALLY CONTROLLED BRAKE SYSTEM)

    Tech Tips

    Pre-crash safety system DTC C1A50 may be stored due to a malfunction in the electronically controlled brake system. Therefore, it is necessary to check for and troubleshoot electronically controlled brake system DTCs first.


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      Electronically controlled brake system DTCs are not output A
      Electronically controlled brake system DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 0.3 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1A50 is not output A
      DTC C1A50 is output B

    A

    USE SIMULATION METHOD TO CHECK (SYMPTOM SIMULATION) Click here

    B

  3. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly Click here.


    NEXT

  4. CHECK FOR DTCs (PRE-CRASH SAFETY SYSTEM)


    1. Clear the DTCs Click here.

    2. Perform the following procedure.

      Tech Tips

      If the following procedure is not performed, the previously output DTC cannot be detected.


      1. Turn the power switch on (IG) and wait 0.3 seconds or more.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C1A50 is not output A
      DTC C1A50 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE SKID CONTROL ECU ASSEMBLY Click here