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

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

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

WIRING DIAGRAM

B210705E34

CAUTION / NOTICE / HINT

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.

PROCEDURE

  1. 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.

    CONNECT CONNECTORS PROPERLY

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

    U122407E02

    1. 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)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK CERTIFICATION ECU

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

      U122511E02

      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)

      -

      -

    REPLACE CERTIFICATION ECU

  4. 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. CHECK FOR DTC

    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK

      DTC B27A7 is not output.

    END (INDOOR ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)

    REPLACE CERTIFICATION ECU