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

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

DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the electrical key antenna (outside luggage). For the electrical key antenna (outside luggage) to detect when the key is brought close to the vehicle, the received request signal is transmitted within approximately 1.0 m (3.28 ft.) of the back door. DTC B27A8 is stored by the certification ECU when an open circuit is detected between the certification ECU and electrical key antenna (outside luggage) (between terminals CLG8 and CLG5, 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 and electrical key antenna (outside luggage) (CLG8 - CLG5, CG8B - CLGB) (1 trip detection logic*).

  • Harness or connector

  • Electrical key antenna (outside luggage)

  • Certification ECU

Any time

  • *: Only output while a malfunction is present.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

Entry lock/unlock operation cannot be performed for back 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

WIRING DIAGRAM

B249998E01

CAUTION / NOTICE / HINT

Note:

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

  • 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 intelligent tester and vehicle begins.

  • Before replacing the certification ECU, refer to the entry and start system (for Entry Function) (Click here).

  • After repair, confirm DTC not reoccur with performing the "DTC Output Confirmation Operation".

  • Electrical key antenna (outside luggage) has an antenna coil between LCG5 and CLGB terminals.

PROCEDURE

  1. CHECK CONNECTOR CONNECTION

    1. Turn the engine switch off.

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

      OK

      Connectors are properly connected.

    Result

    Result

    OK

    NG
    NG

    CONNECT CONNECTORS PROPERLY

    OK

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

    1. Disconnect the G27 certification ECU connector.

    2. Disconnect the R19 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

      G27-19 (CLG8) - R19-1 (CLG5)

      Always

      Below 1 Ω

      G27-20 (CG8B) - R19-2 (CLGB)

      Always

      Below 1 Ω

      G27-19 (CLG8) or R19-1 (CLG5) - Body ground

      Always

      10 kΩ or higher

      G27-20 (CG8B) or R19-2 (CLGB) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    1. B226391E10

      Remove the electrical key antenna (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

    Result

    Result

    OK

    NG
    NG

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    Click here

    OK

  4. REPLACE CERTIFICATION ECU

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

    Result

    Result

    NEXT
    NEXT

  5. CLEAR DTC

    1. Clear the DTCs

      Click here

      Body Electrical > Entry&Start > Clear DTCs

    Result

    Result

    NEXT
    NEXT

  6. CHECK FOR DTC

    1. Check for DTCs

      Click here

      Body Electrical > Entry&Start > Trouble Codes

      OK

      DTC B27A8 is not output.

    Result

    Result

    OK

    NG
    OK

    END (CERTIFICATION ECU IS DEFECTIVE)

    NG

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    Click here