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ENTRY AND START SYSTEM (for Entry Function), Diagnostic DTC:B27A8

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DTC Code DTC Name
B27A8 Open in Outside Luggage Compartment Electrical Key Antenna Circuit
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DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the outside electrical key oscillator (outside luggage). The outside electrical key oscillator (outside luggage) detects that the electrical key is brought close to the vehicle, and when a request signal is received from within 1.0 m (3.28 ft.) of the back door, the signal is transmitted. DTC B27A8 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and outside electrical key oscillator (outside luggage) (CLG8 - CLG5, CG8B - CLGB).

DTC Code DTC Detection Condition Trouble Area
B27A8 An open circuit is detected in the circuit between the certification ECU and outside electrical key oscillator (outside luggage) (CLG8 - CLG5, CG8B - CLGB).
  • Harness or connector

  • Outside electrical key oscillator (outside luggage)

  • Certification ECU

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3, and turn a courtesy light switch on and off at 1.5-second intervals until communication between the tester and vehicle begins.

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PROCEDURE


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    CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the certification ECU and outside electrical key oscillator (outside luggage).

      OK
      Connectors are properly connected.

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    CHECK HARNESS AND CONNECTOR (OUTSIDE ELECTRICAL KEY OSCILLATOR - CERTIFICATION ECU)


    1. A01IO6EE04

      Disconnect the H55 ECU connector.

    2. Disconnect the N22 oscillator connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      N22-1 (CLG5) - H55-19 (CLG8) Always Below 1 Ω
      N22-2 (CLGB) - H55-20 (CG8B) Always Below 1 Ω
      H55-19 (CLG8) - Body ground Always 10 kΩ or higher
      H55-20 (CG8B) - Body ground Always 10 kΩ or higher
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Outside Electrical Key Oscillator [Outside Luggage])

      *2

      Front view of wire harness connector

      (to Certification ECU)


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    INSPECT OUTSIDE ELECTRICAL KEY OSCILLATOR (OUTSIDE LUGGAGE)


    1. A01IP9JE02

      Remove the outside electrical key oscillator (outside luggage) (Click here).

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (CLG5) - 2 (CLGB) Always Below 1 Ω

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    REPLACE CERTIFICATION ECU


    1. Temporarily replace the certification ECU with a new one.


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    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B27A8 is not output.

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    CONNECT CONNECTORS PROPERLY

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE OUTSIDE ELECTRICAL KEY OSCILLATOR (OUTSIDE LUGGAGE)Click here

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    END (CERTIFICATION ECU IS DEFECTIVE)