ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

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

In addition, front seat inner belt information and driver seat door courtesy switch information is received from the main body ECU (multiplex network body ECU).

The electric parking brake system AUTO function (shift-linked function) automatically releases the parking brake when the following conditions are met: 1) Power 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 lever is moved to P and disengages the parking brake when the shift lever is moved out of P when the power switch is on (IG) and the brake pedal is depressed.

WIRING DIAGRAM

A001Q7VE01

CAUTION / NOTICE / HINT

Note


  • The electric parking brake may still operate up to 20 seconds after the power switch is turned off. Before disconnecting connectors or fuses, turn the power switch off and wait 20 seconds or more.

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

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if CAN communication system DTCs are output.

      Click here

      Result
      Result Proceed to
      DTCs are not output A
      DTCs are output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. READ VALUE USING GTS (AUTO MODE)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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 Diagnostic Note
      Auto Mode AUTO (shift-linked) mode permission status OFF or ON

      OFF: Manual mode

      ON: AUTO (shift-linked) mode

      		 -

      Chassis > Electric Parking Brake > Data List
      Tester Display
      Auto Mode

    7. When switching the mode, check that the Data List display turns on and off.

      Result
      Result Proceed to
      The Data List display does not turn on and off according to mode switching A
      The Data List display turns on and off according to mode switching B

    B

    GO TO STEP 5 Click here

    A

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


    1. Inspect the electric parking brake switch (electric parking brake switch assembly).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

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

    OK

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


    1. Disconnect the F67 electric parking brake switch (electric parking brake switch assembly) connector.

    2. Disconnect the M71 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
      M71-20 (LCK1) - F67-6 (LOK1) Always Below 5 Ω
      M71-15 (LCK2) - F67-3 (LOK2) Always Below 5 Ω
      M71-20 (LCK1) or F67-6 (LOK1) - Body ground Always 10 kΩ or higher
      M71-15 (LCK2) or F67-3 (LOK2) - Body ground Always 10 kΩ or higher
      M71-19 (REL1) - F67-5 (RLS1) Always Below 5 Ω
      M71-16 (REL2) - F67-4 (RLS2) Always Below 5 Ω
      M71-19 (REL1) or F67-5 (RLS1) - Body ground Always 10 kΩ or higher
      M71-16 (REL2) or F67-4 (RLS2) - Body ground Always 10 kΩ or higher
      F67-2 (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 (SHIFT POSITION)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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 Diagnostic Note
      Shift Position Position of shift lever P, N, R, D or Unknown

      P: Shift lever in P

      N: Shift lever in N

      R: Shift lever in R

      D: Shift lever in D or B

      		 When not normal, shift position signal system may be malfunctioning

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

    NG

    GO TO HYBRID CONTROL SYSTEM Click here

    OK

  6. READ VALUE USING GTS (STOP LIGHT SWITCH)


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power 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 Diagnostic Note
      Stop Light Switch Stop light switch assembly input signal OFF or ON

      OFF: Brake pedal released

      ON: Brake pedal depressed

      		 -

      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

    NG

    GO TO ELECTRIC PARKING BRAKE SYSTEM Click here

    OK

  7. READ VALUE USING GTS (DOOR COURTESY SW)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical > Main Body > Data List

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Courtesy SW Front door courtesy light switch assembly RH (for RHD) ON or OFF

      ON: Front door RH open

      OFF: Front door RH closed

      		 If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.
      FL Door Courtesy SW Front door courtesy light switch assembly LH (for LHD) ON or OFF

      ON: Front door LH open

      OFF: Front door LH closed

      		 If this item does not change according to the actual state of the driver door, there is a malfunction in the door courtesy light switch or related part.

      Body Electrical > Main Body > Data List
      Tester Display
      FR Door Courtesy SW
      FL Door Courtesy SW
      OK
      The Data List item changes in accordance with the opening and closing of the driver door.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  8. READ VALUE USING GTS (D SEAT BUCKLE SW)


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical > Main Body > Data List

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


      Body Electrical > Main Body > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      D Seat Buckle SW Driver seat belt buckle switch OFF or ON

      ON: Driver seat belt unfastened

      OFF: Driver seat belt fastened

      		 -

      Body Electrical > Main Body > Data List
      Tester Display
      D Seat Buckle SW
      OK
      Unset or Set is displayed on the GTS according to the driver seat belt condition.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    GO TO SEAT BELT WARNING SYSTEM Click here