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Home >> Subaru >> 2016 >> BRZ Series.HyperBlue >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Entry Start System Start System (Keyless Start) >> Entry & Start System (Start Function) >> DTC B2271: IGN Fuse Blown Or IGN Circuit Fault >> Inspection steps
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Inspection steps

CAUTION:
  • The entry & start system has functions that use the CAN communication. Before performing troubleshooting, perform the inspection in "How to troubleshoot", and check that there are no communication problems. (Refer to HOW TO PROCEED WITH TROUBLESHOOTING  )
  • Before replacing the collation ECM (smart key ECM assembly), refer to "entry & start system (entry function)". (Refer to PARTS LOCATION )
  • After repair, perform the [DTC output confirmation operation], and check that the DTC is not output again.
  • Before performing the following inspection steps, check the fuses related to this system.
  1. Checking the harnesses and connectors (power supply)
    1. Remove the D48 connector of the collation ECM (smart key ECM assembly).
    2. Measure the voltage according to the following table.

      Voltage

      VOLTAGE REFERENCE

      Inspection terminals Inspection Conditions Standard value
      D48-2 (+B) - chassis ground Always 9.5 to 16V
      Fig 1: Collation ECM (Smart Key ECM Assembly) Connector Terminal Identification
      G10216318Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of the harnesses or connectors of the circuits that connect to the power source

      OK: Go to next step

  2. Checking the harnesses and connectors (grounding)
    1. Measure the resistance according to the following table.

      Resistance

      RESISTANCE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D48-11 (GND) - chassis ground Always 1 Ωor less
      Fig 2: Collation ECM (Smart Key ECM Assembly) Connector Terminal Identification
      G10216319Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of the harnesses or connectors

      OK: Go to next step

  3. Unit inspection of the collation ECM (smart key ECM assembly)
    1. Reconnect the D48 connector of the collation ECM (smart key ECM assembly).
      Fig 3: Collation ECM (Smart Key ECM Assembly) Connector Terminal Identification
      G10216320Courtesy of SUBARU OF AMERICA, INC.
    2. Measure the voltage according to the following table.

      Voltage

      VOLTAGE REFERENCE

      Inspection terminals Inspection conditions Standard value
      D41-6 (IG1D) - chassis ground Engine switch on (ACC) →Engine switch on (IG) 1V or less →9 V or more
      D48-9 (IG2D) - chassis ground Engine switch on (ACC) →Engine switch on (IG) 1V or less →9 V or more

      NG: Replacement of the collation ECM (smart key ECM assembly)

      OK: Complete (Possibly temporary poor contact)

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