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ENTRY AND START SYSTEM (for Entry Function), Diagnostic DTC:B27A7

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DTC Code DTC Name
B27A7 Open in Inside Luggage Compartment Electrical Key Oscillator Circuit
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DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the indoor electrical key oscillator (inside luggage). The indoor electrical key oscillator (inside luggage) detects that the electrical key is inside the vehicle and transmits the request signal received from the certification ECU. DTC B27A7 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and indoor electrical key oscillator (inside luggage) (CLG7 - CLG6, CG7B - CLGB).

DTC Code DTC Detection Condition Trouble Area
B27A7 An open circuit is detected in the circuit between the certification ECU and indoor electrical key oscillator (inside luggage) (CLG7 - CLG6, CG7B - CLGB).

  • Harness or connector

  • Indoor electrical key oscillator (inside 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


  1. Click here

    CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the engine switch off.

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

      OK
      Connectors are properly connected.

  2. Click here

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


    1. A01IOWXE13

      Disconnect the H51 ECU connector.

    2. Disconnect the P2 oscillator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P2-1 (CLG6) - H51-26 (CLG7) Always Below 1 Ω
      P2-3 (CLGB) - H51-27 (CG7B) Always Below 1 Ω
      H51-26 (CLG7) - Body ground Always 10 kΩ or higher
      H51-27 (CG7B) - Body ground Always 10 kΩ or higher
      H51-15 (E) - Body ground Always Below 1 Ω
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Indoor Electrical Key Oscillator [Inside Luggage])
      *2

      Front view of wire harness connector

      (to Certification ECU)

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    CHECK CERTIFICATION ECU


    1. A01IT2OE05

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H51-26 (CLG7) - H51-15 (E) Engine switch off, all doors closed, key not in cabin and lock sensor off No pulse generation
      H51-26 (CLG7) - H51-15 (E) Engine switch off, all doors closed, key not in cabin and lock sensor on Pulse generation
      H51-27 (CG7B) - H51-15 (E) Engine switch off, all doors closed, key not in cabin and lock sensor off No pulse generation
      H51-27 (CG7B) - H51-15 (E) Engine switch off, all doors closed, key not in cabin and lock sensor on Pulse generation
      Table 2. Text in Illustration
      *1

      Component with harness connected

      (Certification ECU)

      		 - -

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    REPLACE INDOOR ELECTRICAL KEY OSCILLATOR (INSIDE LUGGAGE)


    1. Temporarily replace the indoor electrical key oscillator (inside luggage) with a new or normally functioning one (Click here).


  5. Click here

    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK
      DTC B27A7 is not output.

  6. Click here

    CONNECT CONNECTORS PROPERLY

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPLACE CERTIFICATION ECU

  9. Click here

    END (INDOOR ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)