DTC B27A1: Open in Driver Side Electrical Antenna Circuit [03/2017 - ]: Procedure

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.

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the E1 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
   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) or E1-6 (ANT1) - Body ground	Always	10 kΩ or higher
   D41-13 (CG1B) or E1-3 (ANT2) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Reconnect the D41 and D48 certification ECU (smart key ECU assembly) connectors.
2. Reconnect the E1 front door outside handle assembly LH connector.
3. Using an oscilloscope, check the waveform.

   HINT: 

   Check that the entry cancel function, which is one of the customizing settings of the smart key system, is not set (Refer to CUSTOMIZE PARAMETERS [03/2017 - ] ).

   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 (Refer to OPERATION CHECK [03/2017 - 12/2017] Refer to OPERATION CHECK [12/2017 - ] ).
   • *2: For details about the areas that are outside the entry function detection area, refer to Operation Check (Refer to OPERATION CHECK [03/2017 - 12/2017] Refer to OPERATION CHECK [12/2017 - ] ).

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ] 

Result: 

OK 

See step  4

1. Temporarily replace the front door outside handle assembly LH with a new or normally functioning one (Refer to DISASSEMBLY [03/2017 - 12/2017] Refer to DISASSEMBLY [12/2017 - ] ).

Result: 

NEXT 

See step  5

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [03/2017 - ] ).
2. Recheck for DTCs (Refer to DTC CHECK / CLEAR [03/2017 - ] ).

   OK

   DTC B27A1 is not output.

Result: 

OK 

END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - ]