DTC B2784: Antenna Coil Open / Short [02/2019 - ]: Procedure

1. Check that the connector is properly connected to the transponder key coil.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Immobiliser / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > Immobiliser > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Perform "DTC Output Confirmation Operation" procedure.
2. Enter the following menus: Body Electrical / Immobiliser / Trouble Codes.
3. Check for DTCs.

   Body Electrical > Immobiliser > Trouble Codes 

   Result

   Result	Proceed to
   B2784 is not output	A
   B2784 is output	B

Result: 

A 

END (CONNECTOR WAS NOT CONNECTED PROPERLY) 

Result: 

B 

See step  4

1. Disconnect the G53 transponder key coil connector.
2. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Transponder Key Coil)	*b	Waveform 1
   *c	Waveform 2	-	-

   OK
   
   

   Tester Connection	Condition	Tool Setting	Specified Condition
   G53-1 (ANT1) - Body ground	Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder	20 V/DIV., 2 s./DIV.	Pulse generation (See waveform 1)
   G53-5 (ANT2) - Body ground	Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder	20 V/DIV., 2 s./DIV.	Pulse generation (See waveform 2)

   OK

   Waveform is similar to that shown in the illustration.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSPONDER KEY COIL. Refer to  REMOVAL [11/2018 - ] 

Result: 

NG 

See step  5

1. Disconnect the G52 transponder key ECU assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G52-2 (ANT1) - G53-1 (ANT1)	Always	Below 1 Ω
   G52-3 (ANT2) - G53-5 (ANT2)	Always	Below 1 Ω
   G52-2 (ANT1) or G53-1 (ANT1) - Other terminals and body ground	Always	10 kΩ or higher
   G52-3 (ANT2) or G53-5 (ANT2) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE TRANSPONDER KEY ECU ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 12/2021]  , or refer to  REMOVAL [12/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023]  , or refer to  REMOVAL [10/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR