ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake AUTO Switch Light Circuit

WIRING DIAGRAM

A01FQ9IE01

INSPECTION PROCEDURE

Note


  • If the parking brake ECU 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.

Tech Tips

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

PROCEDURE


  1. READ VALUE USING GTS (AUTO 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 Switch Condition Normal Condition
      AUTO Switch

      AUTO switch input information display/

      ON or OFF

      Power switch on (IG)

      AUTO switch is pressed and held

      ON: AUTO switch is pressed and held

      OFF: AUTO switch OFF (released)
      OK
      On the GTS screen, item changes between ON and OFF according to switch operation.
      Result
      Result Proceed to
      GTS screen does not display ON even though AUTO switch (parking light switch assembly) is pressed. A
      GTS screen displays ON while pressing AUTO switch (parking light switch assembly). B

    B

    CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - AUTO SWITCH) Click here

    A

  2. INSPECT AUTO SWITCH (PARKING LIGHT SWITCH ASSEMBLY)


    1. Remove the electric parking brake switch Click here.

    2. Inspect the AUTO switch (parking light switch assembly) Click here.


    NG

    REPLACE PARKING LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the U37 parking brake ECU assembly connector.

    2. Disconnect the N46 AUTO switch (parking light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U37- 5 (AUTO) - N46-1 (AUTO) Always Below 5 Ω
      U37- 5 (AUTO) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (PARKING BRAKE ECU - AUTO SWITCH)


    1. Disconnect the U36 parking brake ECU assembly connector.

    2. Disconnect the N46 AUTO switch (parking light switch assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U36-6 (LPA) - N46-6 (IND-) Always Below 5 Ω
      U36-6 (LPA) - Body ground Always 100 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here