ENTRY AND START SYSTEM(for Entry Function), Diagnostic DTC:B27A8

DTC Code DTC Name
B27A8 Open in Outside Luggage Compartment Electrical Key Antenna Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the electrical key antenna (outside luggage). For the certification ECU (smart key ECU assembly) to detect when the electrical key transmitter sub-assembly is brought close to the vehicle, the received request signal is transmitted within approximately 1.0 m (3.28 ft.) of the back door. DTC B27A8 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 electrical key antenna (outside luggage) (between terminals CLG8 and ANTE8, or terminals CG8B and CLGB).

DTC No. DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B27A8 An open circuit is detected in the circuit between the certification ECU (smart key ECU assembly) and electrical key antenna (outside luggage) (CLG8 - ANTE8, CG8B - CLGB) (1 trip detection logic*1).
  • Harness or connector

  • Electrical key antenna (outside luggage)

  • Certification ECU (smart key ECU assembly)

Any time*2

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Entry lock/unlock operation cannot be performed for back door -
Related Data List and Active Test
DTC No. Data List and Active Test
B27A8 Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

A01V22UE84

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the vehicle power 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.

  • The entry and start system (for Entry Function) uses a 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.

  • 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 DTC does not reoccur by performing the "DTC Output Confirmation Operation".

  • Electrical key antenna (outside luggage) has an antenna coil between ANTE8 and CLGB terminals.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION


    1. Turn the power switch off.

    2. Check that the connectors are properly connected to the certification ECU (smart key ECU assembly) and the electrical key antenna (outside luggage).

      OK
      Connectors are properly connected.

    NG
    OK
  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE))


    1. Disconnect the F46 and F48 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the K12 electrical key antenna (outside luggage) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F46-2 (CLG8) - K12-1 (ANTE8) Always Below 1 Ω
      F46-1 (CG8B) - K12-2 (CLGB) Always Below 1 Ω
      F48-1 (E) - Body ground Always Below 1 Ω
      F46-2 (CLG8) - Body ground Always 10 kΩ or higher
      F46-1 (CG8B) - Body ground Always 10 kΩ or higher

    NG
    OK
  3. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)


    1. Remove the electrical key antenna (outside luggage) Click here.

    2. Inspect the electrical key antenna (outside luggage) Click here.


    NG
    OK
  4. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one (Refer to Service Bulletin).


    NEXT
  5. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs Click here.

      OK
      B27A8 output does not recur.

    OK
    NG