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

Note

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*).

  • Wire harness or connector

  • Electrical key antenna (outside luggage)

  • Certification ECU (smart key ECU assembly)

  • DTC Output Confirmation Operation

  • 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

B320942E45

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 (Click 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 engine 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 the entry and start system (for Entry Function) precaution.

    Click here

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

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

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)

    1. Disconnect the E34 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the L17 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

      E34-2 (CLG8) - L17-1 (ANTE8)

      Always

      Below 1 Ω

      E34-1 (CG8B) - L17-2 (CLGB)

      Always

      Below 1 Ω

      E34-2 (CLG8) or L17-1 (ANTE8) - Body ground

      Always

      10 kΩ or higher

      E34-1 (CG8B) or L17-2 (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. B226391C14

      *a

      Component without harness connected

      (Electrical Key Antenna (Outside Luggage))

      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)

    OK

  4. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

    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 B27A8 is not output.

    Result

    Proceed to

    OK

    NG
    OK

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

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)