PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:C1A64

DTC Code DTC Name
C1A64 Brake Control Signal Mismatch

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) sends signals to the driving support ECU assembly according to the brake control status. If the driving support ECU assembly receives an electronically controlled brake system malfunction signal from the skid control ECU (brake booster with master cylinder assembly), it will store DTC C1A64.

DTC No. Detection Item DTC Detection Condition Trouble Area
C1A64 Brake Control Signal Mismatch While the power switch is on (IG), the driving support ECU assembly receives an electronically controlled brake system malfunction signal from the skid control ECU (brake booster with master cylinder assembly) continuously for 0.5 seconds or more.

  • Electronically controlled brake system

  • Skid control ECU (Brake booster with master cylinder 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.

    Click here

PROCEDURE


  1. CHECK FOR DTCs

    Tech Tips

    Pre-crash safety system DTC C1A64 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.


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Click here

    A

  2. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

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


    1. 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 0.5 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A64 is not output A
      C1A64 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  4. REPLACE DRIVING SUPPORT ECU ASSEMBLY


    1. Replace the driving support ECU assembly.

      Tech Tips

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.


      Body Electrical > Pre-Crash 2 > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

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


    1. 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 0.5 seconds or more.

    2. Check for DTCs.


      Body Electrical > Pre-Crash 2 > Trouble Codes
      Result
      Result Proceed to
      C1A64 is not output A
      C1A64 is output B

    A

    END (DRIVING SUPPORT ECU ASSEMBLY WAS DEFECTIVE)

    B

    REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) for LHD: Click here for RHD: Click here