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

DESCRIPTION

The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly (driver side electrical key antenna) at intervals of 250 ms. For the certification ECU (smart key ECU assembly) to detect when the key is brought close to the vehicle, a signal requesting a response from the key is transmitted within approximately 1 m (3.28 ft.) of the driver side door at intervals of 250 ms. DTC B27A1 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 front door outside handle assembly (driver side electrical key antenna) (between terminals CLG1 and ANT1, or terminals CG1B and ANT2).

• *1: Only output while a malfunction is present.

• *2: Only when the vehicle is stopped.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION

   
   

   1. Turn the engine switch off.

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

      OK
      Connectors are properly connected.

   
   

   NG

   CONNECT CONNECTORS PROPERLY

   OK

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

   
   

   1. Disconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.

   2. Disconnect the E1*1 or F5*2 front door outside handle assembly connector.

      
      

      • *1: for LHD

      • *2: for RHD

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

      Standard Resistance
      for LHD Tester Connection Condition Specified Condition D41-12 (CLG1) - E1-6 (ANT1) Always Below 1 Ω D41-13 (CG1B) - E1-3 (ANT2) Always Below 1 Ω D48-11 (GND) - Body ground Always Below 1 Ω D41-12 (CLG1) - Body ground Always 10 kΩ or higher D41-13 (CG1B) - Body ground Always 10 kΩ or higher
      for RHD Tester Connection Condition Specified Condition D41-12 (CLG1) - F5-6 (ANT1) Always Below 1 Ω D41-13 (CG1B) - F5-3 (ANT2) Always Below 1 Ω D48-11 (GND) - Body ground Always Below 1 Ω D41-12 (CLG1) - Body ground Always 10 kΩ or higher D41-13 (CG1B) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

3. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER SIDE ELECTRICAL KEY ANTENNA)

   

   Text in Illustration

   *a	Component with harness connected (Certification ECU (smart key ECU assembly))	*b	Waveform 1
   *c	Waveform 2	-	-

   
   

   1. Reconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.

   2. Reconnect the E1*1 or F5*2 front door outside handle assembly connector.

      
      

      • *1: for LHD

      • *2: for RHD

   3. Using an oscilloscope, check the waveform.

      Tech Tips

      Check that the entry cancel function, which is one of the customizing settings of the entry and start system, is not set Click here.

      OK

      Tester Connection Switch Condition Tool Setting Specified Condition D41-12 (CLG1) - D48-11 (GND) Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought inside detection area*1 All doors locked through wireless operation 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 1) D41-12 (CLG1) - D48-11 (GND) Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle Electrical key transmitter sub-assembly brought outside detection area*2 All doors locked through wireless operation 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 1) D41-13 (CG1B) - D48-11 (GND) Procedure: Engine switch off Electrical key transmitter sub-assembly brought outside vehicle All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked with electrical key transmitter sub-assembly 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform 2)

      
      

      • *1: For details about the areas that are inside the entry function detection area, refer to Operation Check Click here.

      • *2: For details about the areas that are outside the entry function detection area, refer to Operation Check Click here.

   
   

   NG

   REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

   OK

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

   
   

   1. Temporarily replace the front door outside handle assembly with a new or normally functioning one Click here.

   
   

   NEXT

5. CHECK DTC OUTPUT

   
   

   1. Clear the DTCs Click here.

   2. Recheck for DTCs Click here.

      OK
      DTC B27A1 is not output.

   
   

   OK

   END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY WAS DEFECTIVE)

   NG

   REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)