ELECTRIC PARKING BRAKE SYSTEM Electric Parking Brake System AUTO Function Circuit

DESCRIPTION

The parking brake ECU assembly receives shift position information from the power management control ECU through CAN communication. When the power switch is on (IG) and the AUTO switch (parking light switch assembly) is turned ON, the electric parking brake system AUTO function operates as follows: 1) when the brake pedal is depressed and the shift lever is moved from P to a position other than P, parking brake release control automatically operates; or 2) when the brake pedal is depressed and the shift lever is moved from a position other than P to P, parking brake lock control automatically operates.

WIRING DIAGRAM

B002BWXE07

CAUTION / NOTICE / HINT

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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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

    READ VALUE USING GTS (P/N/R/D POSITION) Click here

    A

  2. INSPECT AUTO SWITCH (PARKING LIGHT SWITCH ASSEMBLY)


    1. Remove the AUTO switch (parking light switch assembly) 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
      N46- 5 (GND2) - Body ground Always Below 5 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    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 Condition Normal Condition
      P Position

      Shift lever position input information display/

      ON or OFF

      Power switch on (IG)

      Shift lever is in P

      ON: Shift lever is in P

      OFF: Shift lever not in P
      N Position

      Shift lever position input information display/

      ON or OFF

      Power switch on (IG)

      Shift lever is in N

      ON: Shift lever is in N

      OFF: Shift lever not in N
      R Position

      Shift lever position input information display/

      ON or OFF

      Power switch on (IG)

      Shift lever is in R

      ON: Shift lever is in R

      OFF: Shift lever not in R
      D Position

      Shift lever position input information display/

      ON or OFF

      Power switch on (IG)

      Shift lever is in D

      ON: Shift lever is in D

      OFF: Shift lever not in D
      OK
      On the GTS screen, item changes between ON and OFF according to shift lever operation.
      Result
      Result Proceed to
      OK A
      NG (for 2AR-FSE) B
      NG (for 2GR-FXE) C

    B

    GO TO HYBRID CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO HYBRID CONTROL SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  5. 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) 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
      Stop Light Switch

      Stop light switch input information display/

      ON or OFF

      Power switch on (IG)

      Stop light switch ON (brake pedal depressed)

      ON: Stop light switch ON (brake pedal depressed)

      OFF: Stop light switch OFF (brake pedal released)
      OK
      On the GTS screen, item changes between ON and OFF according to switch operation.

    NG

    GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    OK

  6. PERFORM ACTIVE TEST USING GTS (AUTO LIGHT)


    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 / Active Test.

    5. Check the values by referring to the table below.

      Electric Parking Brake
      Tester Display Test Part Control Range Normal Condition
      Auto Light AUTO switch light ON or OFF

      ON: AUTO switch light turns on

      OFF: AUTO switch light turns off
      OK
      Indicator light turns on when operating the GTS.

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

  7. CHECK HARNESS AND CONNECTOR (BATTERY - AUTO SWITCH)


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

    2. B002BJNE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to AUTO switch [parking light switch assembly])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N46-3 (IND+) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the U36 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
      U36-6 (LPA) - N46-6 (IND-) Always Below 5 Ω
      U36-6 (LPA) - Body ground Always 100 kΩ or higher

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR