ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13AD/23

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

DESCRIPTION

DTC Code Detection Condition Trouble Area
C13AD/23

All of following conditions are met:


  1. Electric parking brake ECU is ON (power switch is ON (IG), or 15 seconds after power switch is OFF and electric parking brake switch lock control is operating)

  2. When parking brake is not operating: +B voltage is less than 8.5 V*; when parking brake is operating: +B voltage is less than 3.5 V*

  3. Problem occurs for approx. 0.5 seconds

  • E-PKB H-fuse

  • Harness or connector

  • Electric parking brake ECU

Tech Tips

*: This value is based on the assumption that the auxiliary battery voltage is 12 V.

WIRING DIAGRAM

A000UA6E02
*1 from Auxiliary Battery
*2 Electric Parking Brake ECU

CAUTION / NOTICE / HINT

Note


  • If the electric parking brake ECU or parking brake with bracket actuator assembly is replaced, perform the "RESET MEMORY" and "ACQUIRE TENSION SENSOR ZERO POINT" procedures Click here.

  • Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

PROCEDURE


  1. INSPECT FUSE (E-PKB)


    1. Remove the E-PKB H-fuse from the luggage room junction block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      E-PKB H-fuse Always Below 1 Ω
      Result
      Result Proceed to
      Outside of the specified condition A
      Within the specified condition B

    B

    CHECK HARNESS AND CONNECTOR (ECU - AUXILIARY BATTERY) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (ECU - FUSE)


    1. Disconnect the S46 ECU connector.

    2. A000XM5E03
      *1 Front view of wire harness connector: (to Electric Parking Brake ECU)

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S46-8 (+B) - Body ground Always 10 kΩ or higher

    OK

    REPLACE FUSE

    NG

    CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE

  3. CHECK HARNESS AND CONNECTOR (ECU - AUXILIARY BATTERY)


    1. Disconnect the S46 ECU connector.

    2. A000XM5E03
      *1 Front view of wire harness connector: (to Electric Parking Brake ECU)

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

      Standard voltage
      Tester Connection Condition Specified Condition
      S46-8 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK ELECTRIC PARKING BRAKE ECU (DATA LIST)


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester ON.

    4. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    5. Check the values by referring to the table below.

      Electric Parking Brake
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      +B Voltage Value

      +B power source information display/

      Lo / Mid / Hi

      		 Hi -
      OK
      Values are as shown in normal condition.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE ELECTRIC PARKING BRAKE ECU Click here