ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13AD/23

DTC Code DTC Name
C13AD/23 Open in +B Circuit

DESCRIPTION

The parking brake ECU assembly operates the parking brake motor RH and LH with power supplied from the +B and +B2 terminals.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13AD/23 Open in +B Circuit

All of following conditions are met:


  1. Engine switch on (IG) or electric parking brake switch assembly pulled to lock side with engine switch off.

  2. When parking brake motor is not operating, +B voltage is less than 8.5 V* or when parking brake motor is operating, +B voltage is less than 3.5 V*

  3. When parking brake motor is not operating, malfunction is detected for approximately 1 second

    When parking brake motor is operating, malfunction is detected for approximately 0.5 seconds

Tech Tips

*: When the battery voltage is 12 V.

  • Wire harness or connector

  • Skid control ECU (brake actuator assembly)

 DTC stored An electric parking brake system malfunction is displayed on the multi-information display.

WIRING DIAGRAM

B005QDAE02
*1 ABS NO. 2
*2 Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Before disconnecting connectors or fuses, turn the engine switch off and wait 20 seconds or more.

  • When replacing the skid control ECU (brake actuator assembly), operate the electric parking brake switch assembly as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).

PROCEDURE


  1. READ VALUE USING GTS (ECU +B1 VOLTAGE / ECU +B2 VOLTAGE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / ABS/VSC/TRC/EPB / Data List.

    6. Check the Data List.


      Chassis > ABS/VSC/TRC/EPB > Data List
      Tester Display Measurement Item Range Normal Condition
      ECU +B1 Voltage Skid control ECU (brake actuator assembly) +B1 voltage 0.00 to 20.00 V 11 to 14 V
      ECU +B2 Voltage Skid control ECU (brake actuator assembly) +B2 voltage 0.00 to 20.00 V 11 to 14 V

      Chassis > ABS/VSC/TRC/EPB > Data List
      Tester Display
      ECU +B1 Voltage
      ECU +B2 Voltage
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - BATTERY)


    1. Turn the engine switch off.

    2. B005MOKC11
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      Disconnect the A41 skid control ECU (brake actuator assembly) connector.

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A41-14 (+BS) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR