ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The parking brake ECU assembly receives shift position information from the ECM via CAN communication, and wheel speed signal and stop light switch signals from the skid control ECU (brake actuator assembly).

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Engine switch is on (IG), 2) brake pedal is depressed, and 3) shift lever is moved out of P. When the shift lever is moved to P with these conditions met, the function automatically locks the parking brake.

The electric parking brake system AUTO (shift-linked function) automatically engages the parking brake when the shift level is moved to P and disengages the parking brake when the shift lever is moved out of P when the engine switch is on (IG) and the brake pedal is depressed.

WIRING DIAGRAM

B006N3KE03

CAUTION / NOTICE / HINT

Note


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

  • When replacing the parking brake ECU assembly, operate the electric parking brake switch (combination switch assembly) as the parking brake indicator light blinks (red) when the engine switch is first turned on (IG).

PROCEDURE


  1. CHECK DTC (CAN COMMUNICATION SYSTEM)


    1. Check for DTCs.

      Click here


      Chassis > Electric Parking Brake > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM for LHD: Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD: Click here

    A

  2. READ VALUE USING GTS (AUTO MODE)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    6. Read the Data List according to the display on the GTS.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition
      Auto Mode AUTO (shift-linked) mode permission status ON or OFF

      ON: AUTO (shift-linked) mode

      OFF: Manual mode

      Chassis > Electric Parking Brake > Data List
      Tester Display
      Auto Mode
      OK
      On the GTS screen, ON or OFF is displayed accordingly.

      Tech Tips

      For details regarding mode switching: Click here

      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 5 Click here

    OK

  3. INSPECT ELECTRIC PARKING BRAKE SWITCH (COMBINATION SWITCH ASSEMBLY)


    1. Remove the electric parking brake switch (combination switch assembly).

      Click here

    2. Inspect the electric parking brake switch (combination switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ELECTRIC PARKING BRAKE SWITCH (COMBINATION SWITCH ASSEMBLY) Click here

    OK

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


    1. Disconnect the G23 electric parking brake switch (combination switch assembly) connector.

    2. Disconnect the K14 parking brake ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K14-20 (LCK1) - G23-6 (LOK1) Always Below 5 Ω
      K14-15 (LCK2) - G23-13 (LOK2) Always Below 5 Ω
      K14-20 (LCK1) or G23-6 (LOK1) - Body ground Always 10 kΩ or higher
      K14-15 (LCK2) or G23-13 (LOK2) - Body ground Always 10 kΩ or higher
      K14-19 (REL1) - G23-5 (RLS1) Always Below 5 Ω
      K14-16 (REL2) - G23-12 (RLS2) Always Below 5 Ω
      K14-19 (REL1) or G23-5 (RLS1) - Body ground Always 10 kΩ or higher
      K14-16 (REL2) or G23-12 (RLS2) - Body ground Always 10 kΩ or higher
      G23-2 (GND1) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. READ VALUE USING GTS (P / N / R / D POSITION)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    6. Read the Data List according to the display on the GTS.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition
      P Position Shift lever position input signal ON or OFF

      ON: Shift lever is in P

      OFF: Shift lever is not in P
      N Position Shift lever position input signal ON or OFF

      ON: Shift lever is in N

      OFF: Shift lever is not in N
      R Position Shift lever position input signal ON or OFF

      ON: Shift lever is in R

      OFF: Shift lever is not in R
      D Position Shift lever position input signal ON or OFF

      ON: Shift lever is in D or M

      OFF: Shift lever is not in D or M

      Chassis > Electric Parking Brake > Data List
      Tester Display
      P Position
      N Position
      R Position
      D Position
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Result Proceed to
      OK A
      NG (for Automatic Transaxle) B
      NG (for Continuously Variable Transaxle) C

    B

    GO TO AUTOMATIC TRANSAXLE SYSTEM Click here

    C

    GO TO CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM Click here

    A

  6. READ VALUE USING GTS (STOP LIGHT SWITCH)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / Electric Parking Brake / Data List.

    6. Read the Data List according to the display on the GTS.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition
      Stop Light Switch Stop light switch assembly input signal ON or OFF

      ON: Brake pedal depressed

      OFF: Brake pedal released

      Chassis > Electric Parking Brake > Data List
      Tester Display
      Stop Light Switch
      OK
      On the GTS screen, ON or OFF is displayed accordingly.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    GO TO VEHICLE STABILITY CONTROL SYSTEM Click here