DTC B27A1: Open in Driver Side Electrical Antenna Circuit [08/2019 - ]: Procedure

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

   OK

   Connectors are properly connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the F113 certification ECU (smart key ECU assembly) connector.
2. Disconnect the M2 front door outside handle assembly LH (for driver door) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F113-4 (CLG1) - M2-6 (ANT1)	Always	Below 1 Ω
   F113-3 (CG1B) - M2-4 (ANT2)	Always	Below 1 Ω
   F113-11 (E) - Body ground	Always	Below 1 Ω
   F113-4 (CLG1) or M2-6 (ANT1) - Body ground	Always	10 kΩ or higher
   F113-3 (CG1B) or M2-4 (ANT2) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   F113-4 (CLG1) - F113-11 (E)	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 1)
   	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 2)
   F113-3 (CG1B) - F113-11 (E)	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought inside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 3)
   	Procedure: Engine switch off All doors closed Electrical key transmitter sub-assembly not inside vehicle All doors locked through wireless operation (electrical key transmitter sub-assembly brought outside detection area*)	5 V/DIV., 500 ms/DIV.	Pulse generation (See waveform 4)

   1. *: For details about the entry function detection area, refer to Operation Check.

      Refer to OPERATION CHECK [08/2019 - 08/2021] , or refer to OPERATION CHECK [08/2021 - 08/2022] , or refer to OPERATION CHECK [08/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  4

1. Replace the front door outside handle assembly LH (for driver door) with a new one or the front door outside handle assembly LH (for front passenger door) if it is functioning properly.

   Refer to DISASSEMBLY [08/2015 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [08/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [08/2019 - ]

   OK

   DTC B27A1 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR) WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [08/2019 - ]