ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A1/12

DTC Code DTC Name
C13A1/12 Short in Power Supply Relay Circuit

DESCRIPTION

The parking brake ECU assembly performs the lock/release operation of the parking brake based on signals from the electric parking brake switch assembly, or instruction signals from other systems via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area
C13A1/12 Short in Power Supply Relay Circuit

Both 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. Parking brake ECU assembly power source relay is shorted for approximately 60 seconds

  • Wire harness or connector

  • Electric parking brake switch assembly

  • Parking brake ECU assembly
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch on (IG) ○ -
Electric parking brake switch assembly pulled to lock side with engine switch off - ○
Malfunction Status Parking brake ECU assembly power source relay is shorted ○ ○
Detection Time Approximately 60 seconds Approximately 60 seconds
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B002CVXE01
*a Lock Switch (Push)
*b Release Switch (Pull)
*c Parking Brake ECU Assembly
*d Electric Parking Brake Switch 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.

  • If the parking brake ECU assembly or electric parking brake actuator is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures

    Click here

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - IG POWER SOURCE CIRCUIT)


    1. B002ECQC25
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      Turn the engine switch off.

    2. Disconnect the parking brake ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U30-4 (IG) - Body ground Engine switch off Below 2.5 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT ELECTRIC PARKING BRAKE SWITCH ASSEMBLY


    1. Remove the electric parking brake switch assembly.

      Click here

    2. Inspect the electric parking brake switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU ASSEMBLY - ELECTRIC PARKING BRAKE SWITCH ASSEMBLY)


    1. Disconnect the K19 electric parking brake switch assembly connector.

    2. B002ECQC26
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      Disconnect the parking brake ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U30-12 (LCK1) - Body ground Always 10 kΩ or higher
      U30-13 (REL2) - Body ground Always 10 kΩ or higher
      U30-15 (LCK2) - Body ground Always 10 kΩ or higher
      U30-16 (REL1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR