DTC    B2784    Antenna Coil Open / Short

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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, and output to the transponder key ECU.

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

WIRING DIAGRAM


B111588E05


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on and turn the intelligent tester main switch on.

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

    Transponder key ECU: 
    Item
    		Measurement Item/Display (Range)
    		Normal Condition
    		Diagnostic Note
    Antenna Coil Status
    		Antenna 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 ASSEMBLY - TRANSPONDER KEY AMPLIFIER)


    B111591E03

  1. Disconnect the T8 ECU and T7 switch connectors.

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

    Resistance:
    Tester Connection
    		Specified Condition
    T8-9 (VC5) - T7-1 (VC5)
    		Below 1 Ω
    T8-10 (CODE) - T7-4 (CODE)
    T8-12 (TXCT) - T7-5 (TXCT)
    T8-13 (AGND) - T7-7 (GND)
    T8-9 (VC5) or T7-1(VC5) - Body ground
    		10 kΩ or higher
    T8-10 (CODE) or T7-4 (CODE) - Body ground
    T8-12 (TXCT) or T7-5 (TXCT) - Body ground
    T8-13 (AGND) or T7-7 (GND) - Body ground



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT TRANSPONDER KEY ECU ASSEMBLY


    B111616E07

  1. Reconnect the T8 ECU and T7 amplifier connectors.

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

    Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    T8-9 (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

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    T9-13 (AGND) - Body ground
    		Always
    		Below 1 Ω



NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK


4.CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER

  1. After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the hybrid control system starts.

    OK:
    Hybrid control system starts.



NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)