DTC B27A5: Open in Front Floor Electrical Key Oscillator Circuit [08/2015 - 08/2019]: Procedure

1. Turn the engine switch off.
2. Check that the connectors are properly connected to the certification ECU and indoor No. 1 electrical key antenna assembly (front floor).

   OK

   Connectors are properly connected.

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

1. Disconnect the G26 certification ECU connector.
2. Disconnect the i1 indoor No. 1 electrical key antenna assembly (front floor) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G26-7 (CLG5) - i1-1 (CLG3)	Always	Below 1 Ω
   G26-8 (CG5B) - i1-3 (CLGB)	Always	Below 1 Ω
   G26-15 (E) - Body ground	Always	Below 1 Ω
   G26-7 (CLG5) or i1-1 (CLG3) - Body ground	Always	10 kΩ or higher
   G26-8 (CG5B) or i1-3 (CLGB) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the G26 certification ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Waveform	-	-
   *a	Component with harness connected (Certification ECU)	*b	Door is open then closed for 30 seconds
   *c	Approximately 30 seconds from when the door is closed and after	-	-

2. Connect the i1 indoor No. 1 electrical key antenna assembly (front floor) connector.
3. Using an oscilloscope, check the waveform.

   OK

   Tester Connection	Switch Condition	Tool Setting	Specified Condition
   G26-7 (CLG5) - G26-15 (E)	Procedure: Engine switch off Door is open Door is closed 30 seconds elapse	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)
   G26-8 (CG5B) - G26-15 (E)	Procedure: Engine switch off Door is open Door is closed 30 seconds elapse	2 V/DIV., 500 ms/DIV.	Pulse generation (See waveform)

Result: 

NG 

REPLACE CERTIFICATION ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

OK 

See step  4

1. Temporarily replace the indoor No. 1 electrical key antenna assembly (front floor) with a new or normally functioning one (Refer to REMOVAL [08/2015 - 08/2021] ).

Result: 

NEXT 

See step  5

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

Result: 

NEXT 

See step  6

1. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

   OK

   DTC B27A5 is not output.

Result: 

OK 

END (INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE) 

Result: 

NG 

REPLACE CERTIFICATION ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )