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 electrical key antenna (outside luggage) 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.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B27A8

Open in Outside Luggage Compartment Electrical Key Antenna Circuit

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*).

  • Electrical key antenna (outside luggage)

  • Electrical key antenna (outside 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

Entry unlock operation cannot be performed for back door

-
Table 2. Related Data List and Active Test

DTC Code

Data List and Active Test

B27A8

Key diagnostic mode can be used to perform troubleshooting

WIRING DIAGRAM

B320942E53

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 electrical key antenna (outside luggage) has an antenna coil between ANTE8 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 electrical key antenna (outside luggage).

      OK

      Connectors are properly connected.

    Result

    Proceed to

    OK

    NG
    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY ANTENNA - CERTIFICATION ECU AND BODY GROUND)

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

    2. Disconnect the T2 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

      G83-2 (CLG8) - T2-1 (ANTE8)

      Always

      Below 1 Ω

      G83-1 (CG8B) - T2-2 (CLGB)

      Always

      Below 1 Ω

      G82-11 (E) - Body ground

      Always

      Below 1 Ω

      G83-2 (CLG8) or T2-1 (ANTE8) - Body ground

      Always

      10 kΩ or higher

      G83-1 (CG8B) or T2-2 (CLGB) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    1. B226391N14

      Remove the electrical key antenna (outside luggage).

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 (ANTE8) - 2 (CLGB)

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    Click here

    OK

  4. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tip:

      Refer to the Service Bulletin.

    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 B27A8 is not output

    DTC B27A8 is output
    DTC B27A8 is not output

    END (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] WAS DEFECTIVE)

    DTC B27A8 is output

    REPLACE ELECTRICAL KEY ANTENNA (OUTSIDE LUGGAGE)

    Click here