Dtc B2784 Antenna Coil Open / Short

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK TRANSPONDER KEY AMPLIFIER (OUTPUT)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

REGISTER KEY

REGISTER ECU COMMUNICATION ID

CLEAR DTC

CHECK FOR DTC

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

The antenna coil receives key code signals from the transponder chip in the key grip. The antenna coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU assembly.
This DTC is stored when there is an open or short in the antenna coil.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2784
The antenna coil built into the transponder key amplifier is open or shorted (determined by communication with the transponder key ECU assembly) (1 trip detection logic*).
  1. Terminal VC5, TXCT or CODE is open.
  2. The antenna coil built into the transponder key amplifier is open.
  1. Harness or connector
  2. Transponder key amplifier
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder.
  1. *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected
Fail-safe Operation when Malfunction Detected
Engine cannot be started
-

Related Data List and Active Test
DTC Code
Data List and Active Test
B2784
Antenna Coil Status

INSPECTION PROCEDURE

NOTICE:
  1. When replacing the transponder key ECU assembly, refer to the Service Bulletin.
  2. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (Click here).

    HINT:
    Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
    OK:
    DTC B2784 is not output.


NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (Click here)

3.CHECK TRANSPONDER KEY AMPLIFIER (OUTPUT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2784 Antenna Coil Open / Short

  1. Using an oscilloscope, check the waveform.

    Text in Illustration
    *a
    		Component with harness connected
    (Transponder Key Amplifier)
    *b
    		Waveform

    1. Waveform (Reference)

      Measurement Condition
      Item
      		Content
      Tester Connection
      		E95-4 (CODE) - E95-7 (AGND)
      Tool Setting
      		1 V/DIV., 100 μs./DIV.
      Condition
      		Key inserted in ignition key cylinder
      OK:
      Waveform is output normally (refer to illustration).


NG
REPLACE TRANSPONDER KEY AMPLIFIER (Click here)
OK


4.REPLACE TRANSPONDER KEY ECU ASSEMBLY

  1. Replace the transponder key ECU assembly (refer to the Service Bulletin).


NEXT


5.REGISTER KEY

  1. Reregister the key (refer to the Service Bulletin).


NEXT


6.REGISTER ECU COMMUNICATION ID

  1. Register the ECU communication ID (refer to the Service Bulletin).


NEXT


7.CLEAR DTC

  1. Clear the DTCs (Click here).


NEXT


8.CHECK FOR DTC

  1. Check for DTCs (Click here).

    HINT:
    Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
    OK:
    DTC B2784 is not output.


NG
REPLACE TRANSPONDER KEY AMPLIFIER (Click here)
OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)