Dtc B2784 Antenna Coil Open / Short


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK CONNECTION OF CONNECTOR

CLEAR DTC

CHECK FOR DTC

CHECK TRANSPONDER KEY COIL (OUTPUT)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

CLEAR DTC

CHECK FOR DTC

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

When an open or short circuit is detected in the antenna coil built into the transponder key coil, the transponder key ECU assembly stores this DTC.

DTC No.
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
B2784
The antenna coil in the transponder key coil is open/shorted.
  1. Harness or connector
  2. Transponder key coil
  3. Transponder key ECU assembly
Insert the key into the ignition key cylinder.

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 No.
Data List and Active Test
B2784
Antenna Coil Status

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2784 Antenna Coil Open / Short


INSPECTION PROCEDURE

NOTICE:
  1. If the transponder key ECU assembly is replaced, refer to the Service Bulletin.
  2. After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
  3. When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
1.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001GV80AJX.html).


NEXT


2.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000001GV80AJX.html).

    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 (LandCruiser RM000003YMJ00XX.html)

3.CHECK CONNECTION OF CONNECTOR

  1. Check that the connectors are properly connected to the transponder key coil.


NEXT


4.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001GV80AJX.html).


NEXT


5.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000001GV80AJX.html).

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


NG
Go to step 6
OK

END (CONNECTOR WAS NOT CONNECTED PROPERLY)

6.CHECK TRANSPONDER KEY COIL (OUTPUT)


  1. Using an oscilloscope, check the waveform.


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Theft Deterrent Keyless Entry.Entry And Start System (For Entry Function). Dtc B2784 Antenna Coil Open / Short


    Text in Illustration
    *a
    		Component with harness connected
    (Transponder Key Coil)
    		*b
    		Waveform 1
    *c
    		Waveform 2
    		-
    		-
    Waveform 1
    Item
    		Content
    Tester Connection
    		G189-1 (ANT1) - Body ground
    Tool Setting
    		2 V/DIV., 500 ms/DIV
    Condition
    		Within 3 seconds of inserting key into ignition key cylinder
    Waveform 2
    Item
    		Content
    Tester Connection
    		G189-5 (ANT2) - Body ground
    Tool Setting
    		2 V/DIV., 500 ms/DIV
    Tool Setting
    		Within 3 seconds of inserting key into ignition key cylinder
    OK:
    Waveform is similar to that shown in the illustration.


NG
Go to step 10
OK


7.REPLACE TRANSPONDER KEY ECU ASSEMBLY

  1. Replace the transponder key ECU assembly with a new one.

    HINT:
    Refer to the Service Bulletin.
    NOTICE:
    Key ID code registration is necessary when replacing the transponder key ECU assembly.
    Refer to the Service Bulletin.

NEXT


8.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001GV80AJX.html).


NEXT


9.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000001GV80AJX.html).

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


NG
REPLACE TRANSPONDER KEY COIL (LandCruiser RM000003YO102BX.html)
OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

10.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)

  1. Disconnect the G74 transponder key ECU assembly connector.

  1. Disconnect the G189 transponder key coil connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G74-4 (ANT1) - G189-1 (ANT1)
    		Always
    		Below 1 Ω
    G74-15 (ANT2) - G189-5 (ANT2)
    		Always
    		Below 1 Ω
    G74-4 (ANT1) - Body ground
    		Always
    		10 kΩ or higher
    G189-1 (ANT1) - Body ground
    		Always
    		10 kΩ or higher
    G74-15 (ANT2) - Body ground
    		Always
    		10 kΩ or higher
    G189-5 (ANT2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


11.REPLACE TRANSPONDER KEY ECU ASSEMBLY

  1. Replace the transponder key ECU assembly with a new one.

    HINT:
    Refer to the Service Bulletin.
    NOTICE:
    Key ID code registration is necessary when replacing the transponder key ECU assembly.
    Refer to the Service Bulletin.

NEXT


12.CLEAR DTC

  1. Clear the DTCs (LandCruiser RM000001GV80AJX.html).


NEXT


13.CHECK FOR DTC

  1. Check for DTCs (LandCruiser RM000001GV80AJX.html).

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


NG
REPLACE TRANSPONDER KEY COIL (LandCruiser RM000003YO102BX.html)
OK

END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)