CAN COMMUNICATION SYSTEM Electric Parking Brake ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Electric Parking Brake ECU Communication Stop Mode

Either condition is met:


  • "Electric Parking Brake" is not displayed on the "Bus Check" screen.

  • "Electric Parking Brake ECU Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside of parking with bracket actuator assembly (parking brake ECU)

  • Parking with bracket actuator assembly (parking brake ECU) CAN branch wire or connector

  • Parking with bracket actuator assembly (parking brake ECU)

WIRING DIAGRAM

A004S05E01

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (PARKING BRAKE ECU CAN BRANCH WIRE)


    1. A004QQ3E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake with Bracket Actuator Assembly [Parking Brake ECU])

      Disconnect the parking brake with bracket actuator assembly (parking brake ECU) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      I1-11 (CANH) - I1-23 (CANL) Ignition switch off 54 to 64 Ω

    NG

    REPAIR OR REPLACE PARKING BRAKE ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS OR CONNECTOR (PARKING BRAKE ECU - BATTERY AND BODY GROUND)


    1. A004O0IE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Parking Brake with Bracket Actuator Assembly [Parking Brake ECU])

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-13 (+B) - Body ground Always 11 to 14 V
      I1-19 (IG) - Body ground Ignition switch ON 9.5 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-24 (GND1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (IG terminal) B
      NG (Except IG terminal) C

    A

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY (PARKING BRAKE ECU) Click here

    B

    GO TO STOP AND START SYSTEM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR