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 No. 3 indoor electrical key antenna assembly (inside luggage). For the No. 3 indoor electrical key antenna assembly (inside luggage) to detect when the electrical key transmitter sub-assembly is inside the luggage, the signal from the certification ECU (smart key ECU assembly) requesting a response from the electrical key transmitter sub-assembly is transmitted inside the luggage. 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 No. 3 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

DTC Output from

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 No. 3 indoor electrical key antenna assembly (inside luggage) (CLG7 - ANTE7, CG7B - CLGB) (1 trip detection logic*).

  • Harness or connector

  • No. 3 indoor electrical key antenna assembly (inside luggage)

  • Certification ECU (smart key ECU assembly)

Any time

*: Only output while a malfunction is present.

Table 1. 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 inside luggage area:

  • Power Source mode does not change when engine switch pressed

  • Electrical key transmitter sub-assembly becomes locked inside vehicle

-
Table 2. Related Data List and Active Test

DTC Code

Data List and Active Test

B27A7

Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

B320942E56

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 hereClick 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 hereClick hereClick here

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

  • The No. 3 indoor electrical key antenna assembly (inside luggage) has an antenna coil between ANTE7 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. 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 - NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY AND BODY GROUND)

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

    2. Disconnect the M21 No. 3 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

      G83-9 (CLG7) - M21-1 (ANTE7)

      Always

      Below 1 Ω

      G83-8 (CG7B) - M21-3 (CLGB)

      Always

      Below 1 Ω

      G82-11 (E) - Body ground

      Always

      Below 1 Ω

      G83-9 (CLG7) or M21-1 (ANTE7) - Body ground

      Always

      10 kΩ or higher

      G83-8 (CG7B) or M21-3 (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. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY)

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

      B282013C08

      *a

      Component with harness connected

      (Certification ECU [Smart Key ECU Assembly])

      *b

      Waveform

      *c

      Before driver door lock sensor touched

      *d

      After driver door lock sensor touched

    2. Connect the M21 No. 3 indoor electrical key antenna assembly (inside luggage) connector.

    3. Using an oscilloscope, check the waveform.

      OK

      Tester Connection

      Switch Condition

      Tool Setting

      Specified Condition

      G83-9 (CLG7) - G82-11 (E)

      1. Procedure:

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors closed

      5. Driver door lock sensor not touched → touched

      2 V/DIV., 500 ms/DIV.

      Pulse generation

      (See waveform)

      G83-8 (CG7B) - G82-11 (E)

      1. Procedure:

      2. Engine switch off

      3. Electrical key transmitter sub-assembly not inside vehicle

      4. All doors closed

      5. Driver door lock sensor not touched → touched

      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. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE)

    1. Temporarily replace the No. 3 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

    Result

    Proceed to

    DTC B27A7 is not output

    DTC B27A7 is output
    DTC B27A7 is not output

    END (NO. 3 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY [INSIDE LUGGAGE] WAS DEFECTIVE)

    DTC B27A7 is output

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)