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Home >> Subaru >> 2018 >> BRZ Limited, Automatic Trans >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Control System >> Power Control System >> DTC B1014: ACC Power Failure >> Inspection steps
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Inspection steps

CAUTION: Before performing troubleshooting, check the fuse for this circuit.
  1. Clearing diagnostic code
    1. Clear the diagnostic code using the SSM4. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
  2. DTC check
    1. Use the SSM4 to confirm that diagnostic code B1014 is not being output again. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    RESULT DESCRIPTION

    Result Go to
    If the diagnostic code is being output again A
    If the diagnostic code is not output B

    B: Go to "How to simulate trouble phenomenon" (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )

    A: Go to next step

  3. Inspection of the wiring harness and connector (Power supply voltage)
    NOTE: For inspection procedures and precautions, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .
    1. Disconnect the instrument panel junction block ASSY connectors 3A and 3E.
    2. Measure the voltage between the terminals.
    VOLTAGE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    3A-20 - Chassis ground ACC ON 11 to 14 V
    3E-1 - Chassis ground Always 11 to 14 V
    G12594711Courtesy of SUBARU OF AMERICA, INC.

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  4. Inspection of the wiring harness and connector (Ground) (Refer to INSPECTION STEPS )

    NG: Repair or replacement of wiring harness or connector

    OK: Go to next step

  5. Inspection of the instrument panel junction block ASSY itself
    1. Remove the instrument panel junction block ASSY. (Refer to REMOVAL )
    2. Remove the main body ECM (network gateway computer) from the instrument panel junction block ASSY.
      G12594712Courtesy of SUBARU OF AMERICA, INC.
    3. Measure the resistance between the terminals.
    STANDARD VALUE RESISTANCE SPECIFICATION

    Inspection terminals Inspection conditions Standard value
    3E-1 - MB-9 (ACC) When battery voltage is not applied between terminals 3A-20 and 3A-12. 10 kΩ or more
    3E-1 - MB-9 (ACC) When battery voltage is applied between terminals 3A-20 and 3A-12. Less than 1 Ω
    3B-18 - MB-11 (GND) Always Less than 1 Ω

    NG: Replacement of the instrument panel junction block ASSY (Refer to REMOVAL )

    OK: Go to next step

    Replacement of the main body ECM (network gateway computer) (Refer to REMOVAL )

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