ENTRY AND START SYSTEM (for Entry Function), Diagnostic DTC:B27A1

DTC Code DTC Name
B27A1 Open in Driver Side Electrical Antenna Circuit

DESCRIPTION

The certification ECU generates a request signal and transmits the signal to the front door outside handle assembly (for driver side) at an interval of 250 ms. The front door outside handle assembly (for driver side) detects when the electrical key is brought close to the vehicle, and when a request signal is received from within 1.0 m (3.28 ft.) of the driver door, the signal is transmitted at an interval of 250 ms. DTC B27A1 is stored by the certification ECU when an open circuit is detected in the circuit between the certification ECU and front door outside handle assembly (for driver side) (CLG1 - ANT1, CG1B - ANT2).

DTC Code DTC Detection Condition Trouble Area
B27A1 An open circuit is detected in the circuit between the certification ECU and front door outside handle assembly (for driver side) (CLG1 - ANT1, CG1B - ANT2).

  • Harness or connector

  • Front door outside handle assembly (for driver side)

  • Certification ECU

WIRING DIAGRAM

A0099ZVE01

INSPECTION PROCEDURE

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 here. Troubleshoot the entry and start system (for Entry Function) after confirming that the communication systems are functioning properly.

  • When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

  • Before replacing the certification ECU, refer to the Service Bulletin.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION


    1. Turn the engine switch off.

    2. Check that the connectors are properly connected to the certification ECU and front door outside handle assembly (for driver side).

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE - CERTIFICATION ECU)


    1. Disconnect the O1*1 or N1*2 handle connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the G38 ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      O1-3 (ANT2) - G38-4 (CG1B) Always Below 1 Ω
      O1-6 (ANT1) - G38-3 (CLG1) Always Below 1 Ω
      O1-2 (GND) - Body ground Always Below 1 Ω
      G38-4 (CG1B) - Body ground Always 10 kΩ or higher
      G38-3 (CLG1) - Body ground Always 10 kΩ or higher
      G38-15 (E) - Body ground Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      N1-3 (ANT2) - G38-4 (CG1B) Always Below 1 Ω
      N1-6 (ANT1) - G38-3 (CLG1) Always Below 1 Ω
      N1-2 (GND) - Body ground Always Below 1 Ω
      G38-4 (CG1B) - Body ground Always 10 kΩ or higher
      G38-3 (CLG1) - Body ground Always 10 kΩ or higher
      G38-15 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK CERTIFICATION ECU


    1. Measure the voltage according to the value(s) in the table below.

      A009BGKE15
      Text in Illustration
      *a

      Component with harness connected

      (Certification ECU)

      		 - -
      OK
      Tester Connection Switch Condition Specified Condition
      G38-3 (CLG1) - G38-15 (E) Engine switch off, all doors closed, key not in cabin and transmitter lock switch not pressed → pressed No pulse generation → Pulse generation
      G38-4 (CG1B) - G38-15 (E) Engine switch off, all doors closed, key not in cabin and transmitter lock switch not pressed → pressed No pulse generation → Pulse generation

    NG

    REPLACE CERTIFICATION ECU

    OK

  4. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER SIDE)


    1. Temporarily replace the front door outside handle assembly (for driver side) with a new or normally functioning one Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B27A1 is not output.

    NG

    REPLACE CERTIFICATION ECU

    OK

    END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY IS DEFECTIVE)