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 Code Detection Condition Trouble Area
C13A1/12

Both of following conditions are met:


  1. Parking brake ECU assembly is ON (engine switch is on (IG), or 15 sec. after engine switch is off and electric parking brake switch lock control is operating)

  2. Parking brake ECU assembly's power source relay is shorted for approx. 60 sec.

  • RR ECU-IG fuse

  • Parking brake ECU assembly

  • Wire harness or connector

  • Electric parking brake switch assembly

WIRING DIAGRAM

A01FG8TE02

INSPECTION PROCEDURE

Note


  • 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.

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

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

PROCEDURE


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


    1. A01FFFHE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

      Disconnect the parking brake ECU assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U37-4 (IG) - Body ground Engine switch off Below 2.5 V

    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.


    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the N23 electric parking brake switch assembly connector.

    2. Disconnect the parking brake ECU assembly connector.

    3. A01FFFHE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U37-12 (LCK1) - Body ground Always 10 kΩ or higher
      U37-13 (REL2) - Body ground Always 10 kΩ or higher
      U37-15 (LCK2) - Body ground Always 10 kΩ or higher
      U37-16 (REL1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here