DTC B2784: Antenna Coil Open / Short [12/2019 - 10/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > Smart Key > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Perform "DTC Output Confirmation Operation" procedure.
2. Check for DTCs.

   Body Electrical > Smart Key > Trouble Codes 

   OK

   DTC B2784 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

See step  3

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Engine Switch)	*b	Waveform
   *c	Waveform (detail)	-	-

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   H49-8 (CODE) - H49-6 (AGND)	Ignition switch off, engine switch pressed with electrical key transmitter sub-assembly held near engine switch*	1 V/DIV., 20 ms./DIV.	Pulse generation (See waveform)
   		2 V/DIV., 100 μs./DIV.	Pulse generation (See waveform (detail))

   1. *: Remove the transmitter battery before performing this inspection.

   OK

   The waveform is similar to that shown in the illustration

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

REPLACE ENGINE SWITCH. Refer to  REMOVAL [12/2019 - 10/2022]