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. Also, the parking brake ECU assembly receives wheel speed information and stop light switch information from the skid control ECU (brake actuator assembly).

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

WIRING DIAGRAM

B002D1RE01

CAUTION / NOTICE / HINT

Note


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

  • If the parking brake ECU assembly is replaced, perform the "Reset Memory" and "Acquire Tension Sensor Zero Point" procedures.

    Click here

PROCEDURE


  1. READ VALUE USING GTS (AUTO SWITCH)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Chassis > Electric Parking Brake > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Auto Switch AUTO switch (Parking Light Switch Assembly) input information display ON or OFF

      ON: AUTO switch (Parking Light Switch Assembly) is pressed and held

      OFF: AUTO switch (Parking Light Switch Assembly) OFF (released)

      		 When not normal, AUTO switch (Parking Light Switch Assembly) system may be malfunctioning.

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

    GO TO STEP 4 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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE PARKING LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the U30 parking brake ECU assembly connector.

    2. Disconnect the K38 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
      U30- 5 (AUTO) - K38-1 (AUTO) Always Below 5 Ω
      U30- 5 (AUTO) - Body ground Always 100 kΩ or higher
      K38- 5 (GND2) - Body ground Always Below 5 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. 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) 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.


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

      ON: Shift lever is in P

      OFF: Shift lever is not in P

      		 When not normal, shift position signal system may be malfunctioning
      N Position Shift lever position input information display ON or OFF

      ON: Shift lever is in N

      OFF: Shift lever is not in N

      		 When not normal, shift position signal system may be malfunctioning
      R Position Shift lever position input information display ON or OFF

      ON: Shift lever is in R

      OFF: Shift lever is not in R

      		 When not normal, shift position signal system may be malfunctioning
      D Position Shift lever position input information display ON or OFF

      ON: Shift lever is in D or M

      OFF: Shift lever is not in D or M

      		 When not normal, shift position signal system may be malfunctioning

      Chassis > Electric Parking Brake > Data List
      Tester Display
      P Position
      N Position
      R Position
      D Position
      OK
      On the GTS screen, item changes between ON and OFF according to shift lever operation.
      Result
      Result Proceed to
      OK A
      NG (for 2UR-GSE with Canister Pump Module) B
      NG (for 2UR-GSE without Canister Pump Module) C

    B

    GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    C

    GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) Click here

    A

  5. 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) 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.


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

      ON: Stop light switch ON (brake pedal depressed)

      OFF: Stop light switch OFF (brake pedal released)

      		 When not normal, stop light switch system may be malfunctioning

      Chassis > Electric Parking Brake > Data List
      Tester Display
      Stop Light Switch
      OK
      On the GTS screen, item changes between ON and OFF according to switch operation.
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  6. PERFORM ACTIVE TEST USING GTS (AUTO LIGHT)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine 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.


      Chassis > Electric Parking Brake > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Auto Light AUTO indicator light ON or OFF

      • Vehicle stopped

      • Engine switch on (IG)

      Chassis > Electric Parking Brake > Active Test
      Tester Display
      Auto Light
      OK
      Indicator light turns on when operating the GTS.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

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


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

    2. B002DIJC04
      *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
      K38-3 (IND+) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the K38 AUTO switch (parking light switch assembly) connector.

    2. Disconnect the U29 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
      U29-6 (LPA) - K38-6 (IND-) Always Below 5 Ω
      U29-6 (LPA) - Body ground Always 100 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE PARKING BRAKE ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR