DTC B27A1-13: Driver Side Electrical Antenna Circuit Open [11/2023 - ]: Procedure

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

   OK

   Connectors are properly connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

Pre-procedure1

1. Disconnect the H138 certification ECU (smart key ECU assembly) connector.
2. Disconnect the J36 front door outside handle assembly (for driver door) connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H138-16 (CLG1) - J36-4 (ANT1)	Always	Below 1 Ω
   H138-15 (CG1B) - J36-6 (ANT2)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Connect the H138 certification ECU (smart key ECU assembly) connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))	*b	Waveform 1
   *c	Waveform 2	*d	Waveform 3
   *e	Waveform 4	-	-

   OK

   Tester Connection	Condition	Tool Setting	Specified Condition
   H138-16 (CLG1) - H138-29 (E)	Procedure: Ignition 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: Ignition 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)
   H138-15 (CG1B) - H138-29 (E)	Procedure: Ignition 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: Ignition 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)

   HINT: 

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

   Refer to OPERATION CHECK [11/2023 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER DOOR). Refer to  DISASSEMBLY [11/2023 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2023 - ]