Dtc B2784 Antenna Coil Open / Short

Securities. Camry. Acv40 Gsv40
Engine Immobiliser. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER POWER SOURCE)

INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER GROUND)

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

The transponder key coil is built into the transponder key amplifier and receives a key code signal from the transponder chip in the key. This signal is amplified by the amplifier, then it is output to the transponder key ECU assembly.

DTC No.
DTC Detection Condition
Trouble Area
B2784
Antenna coil is open/shorted
  1. Wire harness
  2. Transponder key amplifier
  3. Transponder key ECU assembly

WIRING DIAGRAM


Camry. Acv40 Gsv40.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2784 Antenna Coil Open / Short


INSPECTION PROCEDURE

NOTICE:
If the transponder key ECU assembly is replaced, register the key and ECU communication ID.
1.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to the ON position and turn the intelligent tester on.

  1. Select Antenna Coil Status in the DATA LIST and read the value displayed on the intelligent tester.

    IMMOBILISER:
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Antenna Coil Status
    		Transponder key amplifier coil condition/NORMAL or FAIL
    		NORMAL: Antenna coil is normal
    FAIL: Antenna coil is malfunctioning
    		-
    OK:
    NORMAL (Antenna coil is normal) appears on the screen.


OK
REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG


2.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)


    Camry. Acv40 Gsv40.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2784 Antenna Coil Open / Short

  1. Disconnect the E15 ECU and E25 amplifier connectors.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E15-4 (TXCT) - E25-5 (TXCT)
    		Always
    		Below 1 Ω
    E15-5 (AGND) - E25-7 (AGND)
    E15-14 (VC5) - E25-1 (VC5)
    E15-15 (CODE) - E25-4 (CODE)
    E15-4 (TXCT) - Body ground
    		10 kΩ or higher
    E15-5 (AGND) - Body ground
    E15-14 (VC5) - Body ground
    E15-15 (CODE) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER POWER SOURCE)


    Camry. Acv40 Gsv40.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2784 Antenna Coil Open / Short

  1. Reconnect the E15 ECU and E25 amplifier connectors.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E15-14 (VC5) - Body ground
    		No key is in ignition key cylinder
    		Below 1 V
    Key is in ignition key cylinder
    		4.6 to 5.4 V


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK


4.INSPECT TRANSPONDER KEY ECU ASSEMBLY (TRANSPONDER KEY AMPLIFIER GROUND)


    Camry. Acv40 Gsv40.Engine Immobiliser.Engine Immobiliser System (W/ Entry And Start System). Dtc B2784 Antenna Coil Open / Short

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E15-5 (AGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

REPLACE TRANSPONDER KEY AMPLIFIER