ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A2

DTC Code DTC Name
B27A2 Open in Front Passenger Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the front door outside handle assembly RH (front passenger side electrical key antenna) at intervals of 250 ms. For the front door outside handle assembly RH (front passenger side electrical key antenna) to detect when the key is brought close to the vehicle, a signal requesting a response from the key is transmitted within approximately 1 m (3.28 ft.) of the front passenger side door at intervals of 250 ms. DTC B27A2 is stored by the certification ECU when an open circuit is detected between the certification ECU and front door outside handle assembly RH (front passenger side electrical key antenna) (between terminals CLG2 and ANT1, or terminals CG2B and ANT2).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B27A2

Open in Front Passenger Side Electrical Antenna Circuit

An open circuit is detected in the circuit between the certification ECU and front door outside handle assembly RH (CLG2 - ANT1, CG2B - ANT2) (1 trip detection logic*).

  • Harness or connector

  • Front door outside handle assembly RH

  • 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 front passenger side door

-
Table 2. Related Data List and Active Test

DTC Code

Data List and Active Test

B27A2

Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

B249951E59

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 (Click 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".

  • Front door outside handle assembly RH has an antenna coil between ANT1 and ANT2 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 front door outside handle assembly RH.

      OK

      Connectors are properly connected.

    Result

    Result

    OK

    NG
    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE)

    1. Disconnect the G26 certification ECU connector.

    2. Disconnect the N1 front door outside handle assembly RH connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G26-5 (CLG2) - N1-6 (ANT1)

      Always

      Below 1 Ω

      G26-6 (CG2B) - N1-3 (ANT2)

      Always

      Below 1 Ω

      G26-15 (E) - Body ground

      Always

      Below 1 Ω

      N1-2 (GND) - Body ground

      Always

      Below 1 Ω

      G26-5 (CLG2) or N1-6 (ANT1) - Body ground

      Always

      10 kΩ or higher

      G26-6 (CG2B) or N1-3 (ANT2) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU

    1. Connect the G26 certification ECU connector.

      B249957C02

      *1

      Waveform 1

      *2

      Waveform 2

      *a

      Component with harness connected (Certification ECU)

      -

      -

    2. Connect the N1 front door outside handle assembly RH connector.

    3. Using an oscilloscope, check the waveform.

      OK

      Tester Connection

      Switch Condition

      Tool Setting

      Specified Condition

      G26-5 (CLG2) - G26-15 (E)

      Procedure:

      1. Engine switch off

      2. Key brought outside vehicle

      3. All doors closed

      4. Key not inside vehicle

      5. Key brought inside detection area*1

      6. All doors locked through wireless operation

      2 V/DIV., 500 ms/DIV.

      Pulse generation (See waveform 1)

      G26-5 (CLG2) - G26-15 (E)

      Procedure:

      1. Engine switch off

      2. Key brought outside vehicle

      3. All doors closed

      4. Key not inside vehicle

      5. Key brought outside detection area*2

      6. All doors locked through wireless operation

      2 V/DIV., 500 ms/DIV.

      Pulse generation (See waveform 2)

      G26-6 (CG2B) - G26-15 (E)

      Procedure:

      1. Engine switch off

      2. Key brought outside vehicle

      3. All doors closed

      4. Key not inside vehicle

      5. All doors locked with key

      2 V/DIV., 500 ms/DIV.

      Pulse generation (See waveform 2)

      • *1: For details about the areas that are inside the entry function detection area, refer to Operation Check

        Click here

      • *2: For details about the areas that are outside the entry function detection area, refer to Operation Check

        Click here

    Result

    Result

    OK

    NG
    NG

    REPLACE CERTIFICATION ECU

    OK

  4. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH

    1. Temporarily replace the front door outside handle assembly RH with a new or normally functioning one

      Click here

    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 B27A2 is not output.

    Result

    Result

    OK

    NG
    OK

    END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH IS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU