Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - THEFT DETERRENT / KEYLESS ENTRY

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 CodeDTC Detection ConditionTrouble AreaDTC Output Confirmation Operation
B2784The 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*).
Terminal VC5, TXCT or CODE is open.
The antenna coil built into the transponder key amplifier is open.
Harness or connector
Transponder key amplifier
Transponder key ECU assembly
Insert the key into the ignition key cylinder.
*: Only output while a malfunction is present.
Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction DetectedFail-safe Operation when Malfunction Detected
Engine cannot be started-
Related Data List and Active Test
DTC CodeData List and Active Test
B2784Antenna Coil Status

INSPECTION PROCEDURE

  • NOTICE:
When replacing the transponder key ECU assembly, refer to the Service Bulletin.
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

Clear the DTCs ().

NEXT
2.CHECK FOR DTC

Check for DTCs ().

  • 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 ()
3.CHECK TRANSPONDER KEY AMPLIFIER (OUTPUT)
Dtc B2784 Antenna Coil Open / Short. THEFT DETERRENT / KEYLESS ENTRY. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Using an oscilloscope, check the waveform.

Text in Illustration
*aComponent with harness connected
(Transponder Key Amplifier)
*bWaveform

Waveform (Reference)

Measurement Condition
ItemContent
Tester ConnectionE95-4 (CODE) - E95-7 (AGND)
Tool Setting1 V/DIV., 100 μs./DIV.
ConditionKey inserted in ignition key cylinder
  • OK:
  • Waveform is output normally (refer to illustration).
NG
REPLACE TRANSPONDER KEY AMPLIFIER ()
OK
4.REPLACE TRANSPONDER KEY ECU ASSEMBLY

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

NEXT
5.REGISTER KEY

Reregister the key (refer to the Service Bulletin).

NEXT
6.REGISTER ECU COMMUNICATION ID

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

NEXT
7.CLEAR DTC

Clear the DTCs ().

NEXT
8.CHECK FOR DTC

Check for DTCs ().

  • HINT:
  • Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.
  • OK:
  • DTC B2784 is not output.
NG
REPLACE TRANSPONDER KEY AMPLIFIER ()
OK
END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)
THEFT DETERRENT / KEYLESS ENTRY
Land Cruiser URJ200 URJ202 GRJ200 VDJ200
ENGINE IMMOBILISER SYSTEM w/o Entry and Start System