ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A9

DTC Code DTC Name
B27A9 Open in Floor/Extra Electrical Key Oscillator Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the No. 2 electrical key antenna (extra antenna). For the No. 2 electrical key antenna (extra antenna) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, the received request signal is transmitted within approximately 1 m (3.28 ft.) of the charging port lid. DTC B27A9 is stored by the certification ECU (smart key ECU assembly) when an open is detected between the certification ECU (smart key ECU assembly) and No. 2 electrical key antenna (extra antenna) (between terminals CLGP and CLG, or terminals CGPB and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27A9 Open in Floor/Extra Electrical Key Oscillator Circuit An open is detected in the circuit between the certification ECU (smart key ECU assembly) and No. 2 electrical key antenna (extra antenna) (CLGP - CLG, CGPB - CLPB) (1 trip detection logic*).

  • Certification ECU (smart key ECU assembly)

  • No. 2 electrical key antenna (extra antenna)

  • Harness or connector

    DTC Output Confirmation Operation:

  • Any time

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Charging port lid cannot be unlocked -
Related Data List and Active Test
DTC No. Data List and Active Test
B27A9 Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

A003P1WE14

CAUTION / NOTICE / HINT

Note


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

    Click here

  • When using the GTS with the power switch off, connect the GTS to the DLC3 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 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 Precaution.

    Click here

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

PROCEDURE


  1. CHECK CONNECTOR CONNECTION


    1. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and No. 2 electrical key antenna (extra antenna).

      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 ELECTRICAL KEY ANTENNA (EXTRA ANTENNA))


    1. Disconnect the N54 and I1 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the N81 No 2 electrical key antenna (extra antenna) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N54-4 (CLGP) - N81-2 (ANTEP) Always Below 1 Ω
      N54-3 (CGPB) - N81-1 (CLGB) Always Below 1 Ω
      I1-18 (E) - Body ground Always Below 1 Ω
      N54-4 (CLGP) or N81-2 (ANTEP) - Body ground Always 10 kΩ or higher
      N54-3 (CGPB) or N81-1 (CLGB) - Body ground Always 10 kΩ or higher

    4. Reconnect the N54 and I1 certification ECU (smart key ECU assembly) connectors.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR))

    A003KK8C12
    *a

    Component with harness connected

    (Certification ECU (Smart Key ECU Assembly))

    		 *b Waveform 1
    *c Waveform 2 *d Waveform 3
    *e Waveform 4 - -

    1. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Condition Tool Setting Specified Condition
      N54-4 (CLGP) - I1-18 (E)

      Procedure:


      1. Power switch off

      2. All doors closed

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*)

      		 5 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 1)

      Procedure:


      1. Power switch off

      2. All doors closed

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*)

      		 5 V/DIV., 100 ms/DIV.

      Pulse generation

      (See waveform 2)
      N54-3 (CGPB) - I1-18 (E)

      Procedure:


      1. Power switch off

      2. All doors closed

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought inside detection area*)

      		 5 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform 3)

      Procedure:


      1. Power switch off

      2. All doors closed

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors locked through wireless operation

        (electrical key transmitter sub-assembly brought outside detection area*)

      		 5 V/DIV., 100 ms/DIV.

      Pulse generation

      (See waveform 4)

      • *: For details about the entry function detection area, refer to Operation Check.

        Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  4. REPLACE NO. 2 ELECTRICAL KEY ANTENNA (EXTRA ANTENNA)


    1. Temporarily replace the No. 2 electrical key antenna (extra antennat) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.


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

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      OK
      DTC B27A9 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE COMPARTMENT) WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)