SMART ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27AB

DTC Code DTC Name
B27AB Open in Floor 3 Electrical Key Oscillator Circuit

DESCRIPTION

When any door is opened or closed, the certification ECU (smart key ECU assembly) generates a request signal and sends it to the No. 2 indoor electrical key antenna assembly (inside luggage). For the No. 2 indoor electrical key antenna assembly (inside luggage) 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 B27AB 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 (inside luggage) (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27AB Open in Floor 3 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 (inside luggage) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).

  • Harness or connector

  • No. 2 indoor electrical key antenna assembly (inside luggage)

  • Certification ECU (smart key ECU assembly)

    DTC Output Confirmation Operation

  • 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

  • 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 No. Data List and Active Test
B27AB Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

B003KV5E06

CAUTION / NOTICE / HINT

Note


  • The smart 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 smart 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(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 the smart 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".

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 (inside luggage).

      OK
      Connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE))


    1. Disconnect the G17 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the N39 No. 2 indoor electrical key antenna assembly (inside luggage) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G17-28 (CLG7) - N39-1 (ANTE7) Always Below 1 Ω
      G17-29 (CG7B) - N39-3 (CLGB) Always Below 1 Ω
      G17-28 (CLG7) or N39-1 (ANTE7) - Body ground Always 10 kΩ or higher
      G17-29 (CG7B) or N39-3 (CLGB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Connect the G17 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G16-10 (E) - Body ground Always Below 1 Ω

    3. Using an oscilloscope, check the waveform.

      B003S0WC03
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 *b Waveform 1
      *c Within approximately 30 seconds from when the door is closed *d After approximately 30 seconds from when the door is closed
      OK
      Tester Connection Condition Tool Setting Specified Condition
      G17-28 (CLG7) - G16-10 (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 1)
      G17-29 (CG7B) - G16-10 (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 1)
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  4. REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE)


    1. Temporarily replace the No. 2 indoor electrical key antenna assembly (inside luggage) 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
      OK
      DTC B27AB is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE) WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)