SMART KEY SYSTEM (for Entry Function), Diagnostic DTC:B27A2

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

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly RH (for front passenger door) [electrical key antenna] at intervals of 0.25 seconds. For the front door outside handle assembly RH (for front passenger door) [electrical key antenna] to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, a signal requesting a response from the electrical key transmitter sub-assembly is transmitted within approximately 1 m (3.28 ft.) of the front passenger door at intervals of 0.25 seconds. DTC B27A2 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 front door outside handle assembly RH (for front passenger door) [electrical key antenna] (between terminals CLG2 and ANT1, or terminals CG2B and ANT2).

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B27A2 An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and front door outside handle assembly RH (for front passenger door) (CLG2 - ANT1, CG2B - ANT2) (1 trip detection logic*).

  • Wire harness or connector

  • Front door outside handle assembly RH (for front passenger door)

  • Certification ECU (smart key ECU assembly)

 Any time
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 door -
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

A011W5VE18

INSPECTION PROCEDURE

Note

  • The smart key 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 smart key system (for Entry Function) after confirming that the communication systems are functioning properly.

  • When using the Techstream with the power switch off to troubleshoot:

    Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) precaution Click here.

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

  • The front door outside handle assembly RH (for front passenger door) has an antenna coil between ANT1 and ANT2 terminals.

PROCEDURE

  1. CHECK CONNECTOR CONNECTION

    1. Turn the power switch off.

    2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and front door outside handle assembly RH (for front passenger door).

      OK
      Connectors are properly connected.
    NG

    CONNECT CONNECTORS PROPERLY

    OK

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

    1. Disconnect the I86 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the V1 front door outside handle assembly RH (for front passenger door) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I86-13 (CLG2) - V1-6 (ANT1) Always Below 1 Ω
      I86-12 (CG2B) - V1-3 (ANT2) Always Below 1 Ω
      I86-1 (E) - Body ground Always Below 1 Ω
      V1-2 (GND) - Body ground Always Below 1 Ω
      I86-13 (CLG2) or V1-6 (ANT1) - Body ground Always 10 kΩ or higher
      I86-12 (CG2B) or V1-3 (ANT2) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO FRONT PASSENGER SIDE ELECTRICAL KEY ANTENNA)

    1. Connect the I86 certification ECU (smart key ECU assembly) connector.

      A011WY1E04
      Text in Illustration
      *1 Waveform 1 *2 Waveform 2
      *a

      Component with harness connected

      (Certification ECU (smart key ECU assembly))

      		 - -

    2. Connect the V1 front door outside handle assembly RH (for front passenger door) connector.

    3. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      I86-13 (CLG2) - I86-1 (E)

      Procedure:

      1. Power switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Electrical key transmitter sub-assembly not inside vehicle

      5. Electrical key transmitter sub-assembly brought inside detection area*1

      6. All doors locked through wireless operation

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 1)
      I86-13 (CLG2) - I86-1 (E)

      Procedure:

      1. Power switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Electrical key transmitter sub-assembly not inside vehicle

      5. Electrical key transmitter sub-assembly brought outside detection area*2

      6. All doors locked through wireless operation

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 2)
      I86-12 (CG2B) - I86-1 (E)

      Procedure:

      1. Power switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Electrical key transmitter sub-assembly not inside vehicle

      5. All doors locked through wireless operation

      		 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.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  4. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH (FOR FRONT PASSENGER DOOR)

    1. Temporarily replace the front door outside handle assembly RH (for front passenger door) with a new or known good one Click here.

    NEXT

  5. CLEAR DTC

    1. Clear the DTCs Click here.

    NEXT

  6. CHECK FOR DTC

    1. Check for DTCs Click here.

      OK
      DTC B27A2 is not output.
    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY RH (FOR FRONT PASSENGER DOOR) WAS DEFECTIVE)