ENTRY AND START SYSTEM (for Entry Function), Diagnostic DTC:B27A6

DTC Code DTC Name
B27A6 Open in Rear Floor Electrical Key Oscillator Circuit

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and sends it to the indoor electrical key oscillator (for center floor). To detect the key inside the cabin, the indoor electrical key oscillator (for center floor) creates a detection area in the cabin.

DTC B27A6 is detected by the certification ECU (smart key ECU assembly) when an open circuit occurs between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for center floor) terminals (between CLG6 and CLG4, or CG6B and CLGB).

DTC No. DTC Detection Condition Trouble Area
B27A6 Open circuit detected between the certification ECU (smart key ECU assembly) and indoor electrical key oscillator (for center floor) terminals (between CLG6 and CLG4, or CG6B and CLGB).

  • Indoor electrical key oscillator (for center floor)

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

WIRING DIAGRAM

A01NDWSE05

INSPECTION PROCEDURE

Note

The entry and start system (for entry function) uses a multiplex communication system (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 system is functioning properly.

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 indoor electrical key oscillator (for center floor).

      OK
      Connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - INDOOR ELECTRICAL KEY OSCILLATOR)


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

    2. A01NGGVE06
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))
      *2

      Front view of wire harness connector

      (to Indoor Electrical Key Oscillator (for Center Floor))

      Disconnect the indoor electrical key oscillator (for center floor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F58-24 (CLG6) - P18-1 (CLG4) Always Below 1 Ω
      F58-25 (CG6B) - P18-3 (CLGB) Always Below 1 Ω
      F58-24 (CLG6) - Body ground Always 10 kΩ or higher
      F58-25 (CG6B) - Body ground Always 10 kΩ or higher
      P18-1 (CLG4) - Body ground Always 10 kΩ or higher
      P18-3 (CLGB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (INDOOR ELECTRICAL KEY OSCILLATOR SIGNAL OUTPUT)


    1. A01NH8NE11
      Text in Illustration
      *1

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      Reconnect the certification ECU (smart key ECU assembly) connector.

    2. Measure the resistance and check for pulses according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F58-15 (E) - Body ground Always Below 1 Ω
      Standard
      Tester Connection Condition Specified Condition
      F58-24 (CLG6) - F58-15 (E)

      • Power switch off

      • All doors closed

      • Key not in cabin

      • Door outside handle assembly (lock sensor) not touched

      		 No pulse generation
      F58-24 (CLG6) - F58-15 (E)

      • Power switch off

      • All doors closed

      • Key not in cabin

      • Door outside handle assembly (lock sensor) touched

      		 Pulse generation
      F58-25 (CG6B) - F58-15 (E)

      • Power switch off

      • All doors closed

      • Key not in cabin

      • Door outside handle assembly (lock sensor) not touched

      		 No pulse generation
      F58-25 (CG6B) - F58-15 (E)

      • Power switch off

      • All doors closed

      • Key not in cabin

      • Door outside handle assembly (lock sensor) touched

      		 Pulse generation

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

  4. REPLACE INDOOR ELECTRICAL KEY OSCILLATOR (for Center Floor)


    1. Replace the indoor electrical key oscillator (for center floor) Click here.


    NEXT

  5. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Recheck for DTCs.

      OK
      DTC B27A6 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (INDOOR ELECTRICAL KEY OSCILLATOR WAS DEFECTIVE)