ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13B4

DTC Code DTC Name
C13B4 EPB Switch Malfunction

DESCRIPTION

When the electric parking brake switch is pulled, a lock request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly. When the electric parking brake switch is pushed, a release request signal is sent from the skid control ECU (brake actuator assembly) to the parking brake actuator assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
C13B4 EPB Switch Malfunction

  • Parking brake switch open or short circuit is detected for 1 seconds or more

  • Parking brake switch stuck malfunction

  • Electric parking brake switch (electric parking brake switch assembly)

  • 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.
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status Parking brake switch open or short circuit is detected for 1 seconds or more ○ -
Parking brake switch stuck malfunction - ○
Detection Time 1 second or more -
Number of Trips 1 trip 1 trip

WIRING DIAGRAM

B0071MHE08

CAUTION / NOTICE / HINT

Note


  • The electric parking brake may still operate up to 20 seconds after the ignition switch is turned off. Before disconnecting connectors or fuses, turn the ignition switch off and wait 20 seconds or more.

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

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Inspect the electric parking brake switch (electric parking brake switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - ELECTRIC PARKING BRAKE SWITCH (ELECTRIC PARKING BRAKE SWITCH ASSEMBLY))


    1. Disconnect the K37 electric parking brake switch (electric parking brake switch assembly) connector.

    2. Disconnect the A34 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A34-31 (SWI1) - K37-9 (SWI1) Always Below 1 Ω
      A34-32 (SWO1) - K37-10 (SWO1) Always Below 1 Ω
      A34-15 (SWI2) - K37-1 (SWI2) Always Below 1 Ω
      A34-16 (SWO2) - K37-2 (SWO2) Always Below 1 Ω
      A34-31 (SWI1) or K37-9 (SWI1) - Body ground Always 10 kΩ or higher
      A34-32 (SWO1) or K37-10 (SWO1) - Body ground Always 10 kΩ or higher
      A34-15 (SWI2) or K37-1 (SWI2) - Body ground Always 10 kΩ or higher
      A34-16 (SWO2) or K37-2 (SWO2) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      A34-31 (SWI1) - K37-16 (SWI1) Always Below 1 Ω
      A34-32 (SWO1) - K37-15 (SWO1) Always Below 1 Ω
      A34-15 (SWI2) - K37-8 (SWI2) Always Below 1 Ω
      A34-16 (SWO2) - K37-7 (SWO2) Always Below 1 Ω
      A34-31 (SWI1) or K37-16 (SWI1) - Body ground Always 10 kΩ or higher
      A34-32 (SWO1) or K37-15 (SWO1) - Body ground Always 10 kΩ or higher
      A34-15 (SWI2) or K37-8 (SWI2) - Body ground Always 10 kΩ or higher
      A34-16 (SWO2) or K37-7 (SWO2) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DTC


    1. Clear the DTCs.


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check for DTCs.


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

    A

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for LHD: Click here
    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) for RHD: Click here

    B

    USE SIMULATION METHOD TO CHECK Click here