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 "Bus Check".

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

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

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

  • Parking brake with bracket actuator assembly (electric parking brake ECU)

WIRING DIAGRAM

A005VI2E02

INSPECTION PROCEDURE

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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

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

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

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


    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (PARKING BRAKE WITH BRACKET ACTUATOR BRANCH WIRE)

    A005TRWE03
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Parking Brake with Bracket Actuator Assembly)

    1. Disconnect the I1 parking brake with bracket actuator assembly (electric 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 WITH BRACKET ACTUATOR BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (PARKING BRAKE WITH BRACKET ACTUATOR - BATTERY AND BODY GROUND)


    1. 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. A005TRWE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Parking Brake with Bracket Actuator Assembly)

      Disconnect the I1 parking brake with bracket actuator assembly (electric parking brake ECU) connector.

    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

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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