DTC B2784: Antenna Coil Open / Short [08/2015 - ]: Procedure

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

NEXT: Go to next step 

1. Perform "DTC Output Confirmation Operation" procedure.
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2784 is not output.

   Result

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

B → See step   12 

A: Go to next step 

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

NEXT: Go to next step 

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

NEXT: Go to next step 

1. Perform "DTC Output Confirmation Operation" procedure.
2. Check for DTCs.. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2784 is not output.

   Result

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

B → See step   6 

A → END (CONNECTOR WAS NOT CONNECTED PROPERLY) 

1. Using an oscilloscope, check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Transponder Key Coil)	*b	Waveform 1
   *c	Waveform 2	-	-

   Measurement Condition

   Tester Connection	Condition	Tool Setting	Specified Condition
   I180-1 (ANT1) - Body ground	Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 1)
   I180-5 (ANT2) - Body ground	Within 3 seconds of inserting door control transmitter assembly into ignition key cylinder	2 V/DIV., 500 ms./DIV.	Pulse generation (See waveform 2)

   OK

   Waveform is similar to that shown in the illustration.

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   11 

A: Go to next step 

1. Disconnect the I19 transponder key ECU assembly connector.
2. Disconnect the I180 transponder key coil connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I19-4 (ANT1) - I180-1 (ANT1)	Always	Below 1 Ω
   I19-15 (ANT2) - I180-5 (ANT2)	Always	Below 1 Ω
   I19-4 (ANT1) or I180-1 (ANT1) - Body ground	Always	10 kΩ or higher
   I19-15 (ANT2) or I180-5 (ANT2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the transponder key ECU assembly with a new one. Refer to REMOVAL [08/2015 - ] .
   NOTE:

   Key ID code registration is necessary when replacing the transponder key ECU assembly, refer to Registration. Refer to REGISTRATION [08/2015 - ] .

NEXT: Go to next step 

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

NEXT: Go to next step 

1. Perform "DTC Output Confirmation Operation" procedure.
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2784 is not output.

   Result

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

B → See step   11 

A → END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)