ELECTRIC PARKING BRAKE SYSTEM, Diagnostic DTC:C13A4/32, C13AC/34

DTC Code DTC Name
C13A4/32 Open or Short in Release Switch Circuit
C13AC/34 Release Switch Circuit

DESCRIPTION

When electric parking brake switch is pushed to the release side, a release request signal is output to parking brake ECU.

DTC Code Detection Condition Trouble Area
C13A4/32

All of following conditions are met:


  1. Electric parking brake ECU 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. Terminal REL1's voltage is less than 1.4 V or more than 9 V; or terminal REL2's voltage is less than 1.4 V* or more than 9 V*

  3. Problem occurs for approx. 1 sec.

  • Electric parking brake switch

  • Wire harness or connector

  • Electric parking brake ECU
C13AC/34

Both of following conditions are met:


  1. Electric parking brake ECU 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. ON/OFF judgment of release switch 1 and release switch 2 does not match for approx. 1 sec.

  • Electric parking brake switch

  • Wire harness or connector

  • Electric parking brake ECU

Tech Tips

*: When battery voltage is 11 V.

WIRING DIAGRAM

A0019X3E05

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.

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

  • The electric parking brake switch interior's linked double contacts may become unlinked (one is off, one is on) if the switch is halfway pushed/pulled. If this condition continues for 1 second or more, this DTC is output.

PROCEDURE


  1. INSPECT ELECTRIC PARKING BRAKE SWITCH


    1. Remove the electric parking brake switch Click here.

    2. A001A5QE01
      *1 Release
      *2 (Pull)
      *3 OFF
      *4 Component without harness connected: (Electric Parking Brake Switch)

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      6 (RLS1) - 8 (GND) OFF 5.51 to 6.09 kΩ
      Release (Pull) 1.045 to 1.115 kΩ
      10 (RLS2) - 8 (GND) OFF 5.51 to 6.09 kΩ
      Release (Pull) 1.045 to 1.115 kΩ

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)


    1. Disconnect the S48 ECU connector.

    2. Disconnect the L39 switch connector.

    3. A00192LE03
      *1 Front view of wire harness connector: (to Electric Parking Brake ECU)
      *2 Front view of wire harness connector: (to Electric Parking Brake Switch)

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S48-16 (REL1) - L39-6 (RLS1) Always Below 5 Ω
      S48-16 (REL1) - Body ground Always 10 kΩ or higher
      S48-13 (REL2) - L39-10 (RLS2) Always Below 5 Ω
      S48-13 (REL2) - Body ground Always 10 kΩ or higher
      L39-8 (GND) - Body ground Always Below 5 Ω

    OK

    REPLACE ELECTRIC PARKING BRAKE ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR