DTC B27A1: Open in Driver Side Electrical Antenna Circuit [10/2018 - ]: Procedure

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

   OK

   Connectors are properly connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the N61 certification ECU (smart key ECU assembly) connector.
2. Disconnect the K3 front door outside handle assembly LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N61-17 (CLG1) - K3-4 (ANT1)	Always	Below 1 Ω
   N61-16 (CG1B) - K3-5 (ANT2)	Always	Below 1 Ω

4. Reconnect the N61 certification ECU (smart key ECU assembly) connector.

   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
   N61-17 (CLG1) - F44-18 (E)	Procedure: Power 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: Power 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., 100 ms./DIV.	Pulse generation (See waveform 2)
   N61-16 (CG1B) - F44-18 (E)	Procedure: Power 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: Power 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., 100 ms./DIV.	Pulse generation (See waveform 4)

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

      Refer to OPERATION CHECK [10/2018 - 08/2021] , or refer to OPERATION CHECK [08/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH. Refer to  DISASSEMBLY [10/2018 - 07/2022]  , or refer to  DISASSEMBLY [07/2022 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ]