ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A6

DTC Code DTC Name
B27A6 Open in Rear Floor Electrical Key Oscillator Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 2 indoor electrical key antenna assembly (rear floor). For the No. 2 indoor electrical key antenna assembly (rear floor) to detect when the electrical key transmitter sub-assembly is inside the vehicle, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the vehicle. DTC B27A6 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 No. 2 indoor electrical key antenna assembly (rear floor) (between terminals CLG6 and ANTE6, or terminals CG6B and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B27A6 Open in Rear Floor Electrical Key Oscillator Circuit An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor) (CLG6 - ANTE6, CG6B - CLGB) (1 trip detection logic*).

  • Harness or connector

  • No. 2 indoor electrical key antenna assembly (rear floor)

  • Certification ECU (smart key ECU assembly)

 Any time

*: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected

    When electrical key transmitter sub-assembly is in rear seat area

  • Power source mode does not change when engine switch pressed

  • Electrical key transmitter sub-assembly locked inside vehicle

 -
Related Data List and Active Test
DTC Code Data List and Active Test
B27A6 Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

A01QP9OE55

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 GTS with the vehicle engine switch off, connect the GTS to the vehicle 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 the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start. 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 the entry and start system (for Entry Function) precaution.

    Click here

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

  • The No. 2 indoor electrical key antenna assembly (rear floor) has an antenna coil between ANTE6 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 (smart key ECU assembly) and No. 2 indoor electrical key antenna assembly (rear floor).

      OK
      Connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY AND BODY GROUND)


    1. Disconnect the G82 and G83 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the M18 No. 2 indoor electrical key antenna assembly (rear floor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G83-11 (CLG6) - M18-1 (ANTE6) Always Below 1 Ω
      G83-10 (CG6B) - M18-3 (CLGB) Always Below 1 Ω
      G82-11 (E) - Body ground Always Below 1 Ω
      G83-11 (CLG6) or M18-1 (ANTE6) - Body ground Always 10 kΩ or higher
      G83-10 (CG6B) or M18-3 (CLGB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY)


    1. Connect the G82 and G83 certification ECU (smart key ECU assembly) connectors.

      A01QP7SC31
      *a

      Component with harness connected

      (Certification ECU [Smart Key ECU Assembly])

      		 *b Waveform
      *c Within approximately 30 seconds from when the door is closed *d After approximately 30 seconds from when the door is closed

    2. Connect the M18 No. 2 indoor electrical key antenna assembly (rear floor) connector.

    3. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      G83-11 (CLG6) - G82-11 (E)

        Procedure:

      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform)
      G83-10 (CG6B) - G82-11 (E)

        Procedure:

      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform)
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  4. REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR)


    1. Temporarily replace the No. 2 indoor electrical key antenna assembly (rear floor) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Proceed to
      DTC B27A6 is not output
      DTC B27A6 is output

    DTC B27A6 is not output

    END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY [REAR FLOOR] WAS DEFECTIVE)

    DTC B27A6 is output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)