DTC B27A4: Open in Rear Door Electrical Antenna Circuit, Front Passengers Side [09/2015 - ]: Procedure

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

   OK

   Connectors are properly connected.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.
2. Disconnect the O4 rear door outside handle assembly (for front passenger side) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   R1-9 (CLG4) - O4-4 (ANT1)	Always	Below 1 Ω
   R1-8 (CG4B) - O4-5 (ANT2)	Always	Below 1 Ω
   J41-18 (E) - Body ground	Always	Below 1 Ω
   R1-9 (CLG4) or O4-4 (ANT1) - Body ground	Always	10 kΩ or higher
   R1-8 (CG4B) or O4-5 (ANT2) - Body ground	Always	10 kΩ or higher

4. Reconnect the R1 and J41 certification ECU (smart key ECU assembly) connectors.

   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
   R1-9 (CLG4) - J41-18 (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., 100 ms/DIV.	Pulse generation (See waveform 2)
   R1-8 (CG4B) - J41-18 (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., 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 [09/2015 - 08/2019] , or refer to OPERATION CHECK [08/2019 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019]  , or refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  4

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

   Refer to DISASSEMBLY [09/2015 - 08/2016] , or refer to DISASSEMBLY [08/2016 - 12/2017] , or refer to DISASSEMBLY [12/2017 - 08/2019] , or refer to DISASSEMBLY [08/2019 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Body Electrical > Smart Access > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   OK

   DTC B27A4 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (REAR DOOR OUTSIDE HANDLE ASSEMBLY (FOR FRONT PASSENGER SIDE) WAS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019]  , or refer to  REMOVAL [08/2019 - ]