ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A7

DTC Code DTC Name
B27A7 Open in Inside Luggage Compartment Electrical Key Oscillator Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the indoor electrical key oscillator (for luggage compartment). For the indoor electrical key oscillator (for luggage compartment) to detect when the electrical key transmitter sub-assembly is in the cabin, 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 B27A7 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 indoor electrical key oscillator (for luggage compartment) (between terminals CLG7 and ANTE7, or terminals CG7B and CLGB).

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B27A7 Open in Inside Luggage Compartment Electrical Key Oscillator Circuit An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for luggage compartment) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).

  • Certification ECU (smart key ECU assembly)

  • Indoor electrical key oscillator (for luggage compartment)

  • 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

When electrical key transmitter sub-assembly is in luggage compartment:


  • Power source mode does not change when power switch pressed

  • Electrical key transmitter sub-assembly locked inside vehicle

 -
Related Data List and Active Test
DTC No. Data List and Active Test
B27A7 Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

A01MJY6E13

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 the vehicle type 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 entry and start system (for Entry Function) 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. 3 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) - INDOOR ELECTRICAL KEY OSCILLATOR (FOR LUGGAGE COMPARTMENT))


    1. Disconnect the G39 and G41 certification ECU (smart key ECU assembly) connectors.

    2. Disconnect the Q17 indoor electrical key oscillator (for luggage compartment) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G39-4 (CLG7) - Q17-1 (ANTE7) Always Below 1 Ω
      G39-3 (CG7B) - Q17-3 (CLGB) Always Below 1 Ω
      G41-11 (E) - Body ground Always Below 1 Ω
      G39-4 (CLG7) or Q17-1 (ANTE7) - Body ground Always 10 kΩ or higher
      G39-3 (CG7B) or Q17-3 (CLGB) - Body ground Always 10 kΩ or higher

    4. Reconnect the G39 and G41 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 INDOOR ELECTRICAL KEY OSCILLATOR (FOR LUGGAGE COMPARTMENT))

    A01MHMFC82
    *a

    Component with harness connected

    (Certification ECU (Smart Key ECU Assembly))

    		 *b Waveform 1
    *c For 30 seconds after closing any door using the door outside handle *d 30 seconds or more have elapsed after closing any door using the door outside handle

    1. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Condition Tool Setting Specified Condition
      G39-4 (CLG7) - G41-11 (E)

      Procedure:


      1. Power switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      		 2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform 1)
      G39-3 (CG7B) - G41-11 (E)

      Procedure:


      1. Power switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      		 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 INDOOR ELECTRICAL KEY OSCILLATOR (FOR LUGGAGE COMPARTMENT)


    1. Temporarily replace the indoor electrical key oscillator (for luggage compartment) with a new 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 B27A7 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (INDOOR ELECTRICAL KEY OSCILLATOR (FOR LUGGAGE COMPARTMENT) WAS DEFECTIVE)

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)