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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 (smart key ECU assembly) generates a request signal and transmits the signal to the electrical key antenna (outside luggage compartment). For the electrical key antenna (outside luggage compartment) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, the received request signal is transmitted within approximately 1.0 m (3.28 ft.) of the luggage compartment door. DTC B27A8 is stored by the certification ECU (smart key ECU assembly) when an open circuit is detected between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (between terminals CLG8 and ANTE8, or terminals CG8B and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27A8 Open in Outside Luggage Compartment Electrical Key Antenna Circuit An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment) (CLG8 - ANTE8, CG8B - CLGB) (1 trip detection logic*).

  • Certification ECU (smart key ECU assembly)

  • Electrical key antenna (outside luggage compartment)

  • Wire harness or connector
  • DTC Output Confirmation Operation:

  • Any time

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Entry unlock operation cannot be performed for luggage compartment door -
Table 2. Related Data List and Active Test
DTC Code Data List and Active Test
B27A8 Key diagnostic mode can be used to perform troubleshooting
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • The entry and start system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.

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  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the certification ECU (smart key ECU assembly), refer to entry and start system (for Entry Function) Precaution.

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  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

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PROCEDURE


  1. Click here

    CHECK CONNECTOR CONNECTION


    1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage compartment).

      OK
      Connectors are properly connected.
      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))


    1. Disconnect the O5 and O6 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the U39 electrical key antenna (outside luggage compartment) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O5-2 (CLG8) - U39-2 (ANTE8) Always Below 1 Ω
      O5-1 (CG8B) - U39-1 (CLGB) Always Below 1 Ω
      O6-11 (E) - Body ground Always Below 1 Ω
      O5-2 (CLG8) or U39-2 (ANTE8) - Body ground Always 10 kΩ or higher
      O5-1 (CG8B) or U39-1 (CLGB) - Body ground Always 10 kΩ or higher

    4. Reconnect the O5 and O6 certification ECU (smart key ECU assembly) connectors.

      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. *a Component with harness connected (Certification ECU (Smart Key ECU Assembly)) *b Waveform 1
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    CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT))


    1. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Condition Tool Setting Specified Condition
      O5-2 (CLG8) - O6-11 (E)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Luggage electrical key switch off → on

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 1)
      O5-1 (CG8B) - O6-11 (E)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Luggage electrical key switch off → on

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 1)
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  4. Click here

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT)


    1. Temporarily replace the electrical key antenna (outside luggage compartment) with a new one.

      Result
      Proceed to
      NEXT

  5. Click here

    CLEAR DTC


    1. Clear the DTCs.


      1. Body Electrical > Entry&Start > Clear DTCs


      Result
      Proceed to
      NEXT

  6. Click here

    CHECK FOR DTC


    1. Check for DTCs.


      1. Body Electrical > Entry&Start > Trouble Codes


      OK
      DTC B27A8 is not output.
      Result
      Proceed to
      OK
      NG

    • OK

      END (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE)

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)