ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A2/22

DTC Code DTC Name
C13A2/22 Engine / Power Switch Malfunction

DESCRIPTION

When the power switch is turned to on (IG), this turns on the RR-IG1 RLY1 relay built into the No. 1 junction block assembly. Power is then supplied to the parking brake ECU assembly from the auxiliary battery.

DTC No. Detection Condition Trouble Area
C13A2/22

Both of the following conditions are met:


  1. Power switch on (IG)

  2. When the power management control ECU communicates with the acceleration sensor (yaw rate sensor) via CAN communication, IG power supply is not received for approx. 3 seconds.

  • RR ECU-IG fuse

  • Wire harness or connector

  • IG power source circuit

  • Parking brake ECU assembly

WIRING DIAGRAM

A01FRARE01

INSPECTION PROCEDURE

Note


  • If the parking brake ECU assembly or parking brake with bracket actuator assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures Click here.

  • Before disconnecting connectors or fuses, turn the power 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. READ VALUE USING GTS (IG STATUS/IG SWITCH)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG) and the GTS 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
      IG Status

      Power switch information display/

      ON or OFF

      ON: Power switch is on (IG)

      OFF: Power switch is on (ACC) or off

      		 IG circuit
      IG Switch

      IG power source information display/

      ON or OFF

      ON: IG power source is input into parking brake ECU assembly

      OFF: IG power source is not input into parking brake ECU assembly

      		 IG circuit
      OK
      When the power switch is on (IG), items on the GTS are ON.

    NG

    CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - NO. 1 JUNCTION BLOCK) Click here

    OK

  2. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  3. CHECK DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC C13A2/22 is output A
      DTC C13A2/22 is not output B

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - NO. 1 JUNCTION BLOCK)


    1. Disconnect the U36 and U37 parking brake ECU assembly connectors.

    2. Disconnect the 6A No. 1 junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U37-4 (IG) - 6A-49 Always Below 1 Ω
      U37-4 (IG) - Body ground Always 10 kΩ or higher
      U36-3 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPAIR IG POWER SOURCE CIRCUIT