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DTC B27A8: Open in Outside Luggage Compartment Electrical Key Antenna Circuit (07/2015 -): Procedure

  1. CHECK CONNECTOR CONNECTION 
    1. Turn the engine switch off.
    2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage).

      OK

      Connectors are properly connected.

    Result:  NG

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result:  OK

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU) 
    1. Disconnect the A36 and Q1 certification ECU (smart key ECU assembly) connectors.
    2. Disconnect the U10 electrical key antenna (outside luggage) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q1-2 (CLG8) - U10-1 (ANTE8) Always Below 1 Ω
      Q1-1 (CG8B) - U10-2 (CLGB) Always Below 1 Ω
      Q1-2 (CLG8) or U10-1 (ANTE8) - Body ground Always 10 kΩ or higher
      Q1-1 (CG8B) or U10-2 (CLGB) - Body ground Always 10 kΩ or higher

    Result:  NG

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  OK

    OK 

    See step  3

  3. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) 
    1. Remove the electrical key antenna (outside luggage) (Refer to REMOVAL (07/2015 -) ).
      GTY633552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component without harness connected
      (Electrical Key Antenna (Outside Luggage)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (ANTE8) - 2 (CLGB) Always Below 1 Ω

    Result:  NG

    NG 

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) 

    (Refer to REMOVAL (07/2015 -) )

    Result:  OK

    OK 

    See step  4

  4. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 
    1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one (Refer to REMOVAL (07/2015 -) ).

    Result:  NEXT

    NEXT 

    See step  5

  5. CLEAR DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR (07/2015 -) ).

    Result:  NEXT

    NEXT 

    See step  6

  6. CHECK FOR DTC 
    1. Check for DTCs (Refer to DTC CHECK / CLEAR (07/2015 -) ).

      OK

      DTC B27A8 is not output.

    Result:  OK

    OK 

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE) 

    Result:  NG

    NG 

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE) 

    (Refer to REMOVAL (07/2015 -) )

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