DTC B27A1: Open in Driver Side Electrical Antenna Circuit: Procedure

1. Turn the power switch off.
2. 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.

NG → CONNECT CONNECTORS PROPERLY 

OK: Go to next step 

1. Disconnect the C19 certification ECU (smart key ECU assembly) connector.
2. Disconnect the S1 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
   C19-3 (CLG1) - S1-6 (ANT1)	Always	Below 1 Ω
   C19-4 (CG1B) - S1-3 (ANT2)	Always	Below 1 Ω
   C19-15 (E) - Body ground	Always	Below 1 Ω
   S1-2 (GND) - Body ground	Always	Below 1 Ω
   C19-3 (CLG1) or S1-6 (ANT1) - Body ground	Always	10 kΩ or higher
   C19-4 (CG1B) or S1-3 (ANT2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the C19 certification ECU (smart key ECU assembly) connector.
2. Connect the S1 front door outside handle assembly RH connector.
   Fig 1: Identifying Certification ECU (Smart Key ECU Assembly) Connector Terminals With Waveforms

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Certification ECU - Smart Key ECU Assembly)	*b	Waveform 1
   *c	Waveform 2	-	-

3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   C19-3 (CLG1) - C19-15 (E)	Procedure: Power 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)
   C19-3 (CLG1) - C19-15 (E)	Procedure: Power 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 2)
   C19-4 (CG1B) - C19-15 (E)	Procedure: Power 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 2)

   • *1: For details about the areas that are inside the entry function detection area, refer to Operation Check. Refer to OPERATION CHECK .
   • *2: For details about the areas that are outside the entry function detection area, refer to Operation Check. Refer to OPERATION CHECK .

NG → See step   7 

OK: Go to next step 

1. Temporarily replace the front door outside handle assembly LH with a new or normally functioning one. Refer to DISASSEMBLY .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B27A1 is not output.

NG → See step   7 

OK → END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH WAS DEFECTIVE)