ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake AUTO Switch Light Circuit

WIRING DIAGRAM

A000YG4E05

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.

  • Even after the power switch is turned OFF, the electric parking brake ECU may store a DTC as a result of removing a connector or fuse, as the ECU is still operating. Therefore, during inspection or replacement, turn the power switch OFF and wait for 20 seconds before removing the following: 1) connectors of the electric parking brake ECU, and 2) fuses of the electric parking brake system circuit.

Tech Tips

This flowchart is the inspection method for when the AUTO switch light of the electric parking brake continuously illuminates.

PROCEDURE


  1. CHECK AUTO SWITCH (DATA LIST)


    1. Turn the power switch OFF.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch ON (IG) and the tester 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
      AUTO Switch

      AUTO switch input information display/

      ON or OFF

      ON: AUTO switch is pressed and held

      OFF: AUTO switch OFF (released)

      		 -
      Result
      Result Proceed to
      Tester screen does not display ON even though AUTO switch is pressed A
      Tester screen displays ON while pressing AUTO switch B

    B

    CHECK HARNESS AND CONNECTOR (ECU - SWITCH) Click here

    A

  2. INSPECT ELECTRIC PARKING BRAKE SWITCH (AUTO SWITCH)


    1. Remove the electric parking brake switch Click here.

    2. A000W5VE06
      *1 Push
      *2 AUTO Switch
      *3 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
      5 (AUTO) - 8 (GND) AUTO switch is pressed and held Below 1 Ω
      AUTO switch OFF (released) 1 MΩ or higher

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)


    1. Disconnect the S48 ECU connector.

    2. Disconnect the L39 switch connector.

    3. A000XLZE04
      *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- 5 (AUTO) - L39-5 (AUTO) Always Below 5 Ω
      S48- 5 (AUTO) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ECU - SWITCH)


    1. Disconnect the S46 ECU connector.

    2. Disconnect the L39 switch connector.

    3. A000VOTE02
      *1 Front view of wire harness connector: (to Electric Parking Brake ECU)
      *2 LPA
      *3 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
      S46-6 (LPA) - L39-3 (IND-) Always Below 5 Ω
      S46-6 (LPA) - Body ground Always 100 kΩ or higher

    OK

    REPLACE ELECTRIC PARKING BRAKE ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR