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Home >> Infiniti >> 2018 >> QX30 Essential, FWD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Parking Brake System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ELECTRIC PARKING BRAKE CONTROL MODULE POWER SUPPLY 
    1. Turn the ignition switch OFF.
    2. Check the voltage between electric parking brake control module harness connector and ground.

      +

      -

      Voltage

      Electric parking brake control module

      Connector

      Terminal

      M70

      13

      Ground

      11 - 15.5 V

      15

      22

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 2.

  2. CHECK MOTOR POWER SUPPLY CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Check the 30A fuse (#74), 30A fuse (#73) and 5A fuse (#93).
    3. Disconnect the electric parking brake control module harness connector.
    4. Disconnect the fuse and fusible link block 2 harness connector.
    5. Check for continuity between electric parking brake control module harness connector and the fuse and fusible link block 2 harness connector.

      Electric parking brake control module

      Fuse and fusible link block 2

      Continuity

      Connector

      terminal

      Connector

      Terminal

      M70

      13

      M108

      14

      Existed

      15

      13

      22

      M128

      78

    Is the inspection result normal?

    YES

    Perform trouble diagnosis for battery power supply.

    NO

    Repair/replace harness, connector or fuse.

  3. CHECK ELECTRIC PARKING BRAKE CONTROL MODULE GROUND CIRCUIT 
    1. Turn the ignition switch OFF.
    2. Disconnect the electric parking brake control module harness connector.
    3. Check for continuity between electric parking brake control module harness connector and the ground.

      Electric parking brake control module

      --

      Continuity

      Connector

      Terminal

      M70

      28

      Ground

      Existed

      30

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair/replace harness or connector.

  4. CHECK TERMINAL 

    Check electric parking brake control module pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair/replace harness or connector.