DTC    B2784    Antenna Coil Open / Short


DESCRIPTION

The transponder key coil receives key code signals from the key's transponder chip. The coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU.

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

WIRING DIAGRAM


B110396E02


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER (TRANSPONDER KEY COIL)

  1. Check the Data List for proper functioning of the transponder key coil.

    Transponder key ECU assembly: 
    Item
    		Measurement Item / Display (Range)
    		Normal Condition
    		Diagnostic Note
    Antenna Coil Status
    		Transponder key coil condition / NORMAL or FAIL
    		NORMAL: Transponder key coil is normal
    FAIL: Transponder key coil is malfunctioning
    		-

    OK:
    NORMAL (transponder key coil is normal) appears on screen.



OK
REPLACE TRANSPONDER KEY ECU ASSEMBLY
NG


2.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY AMPLIFIER)
B110403E01

  1. Disconnect the T21 ECU connector.

  1. Disconnect the T20 amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    T21-14 (VC5) - T20-1 (VC5)
    		Below 1 Ω
    T21-15 (CODE) - T20-4 (CODE)
    		Below 1 Ω
    T21-4 (TXCT) - T20-5 (TXCT)
    		Below 1 Ω
    T21-5 (AGND) - T20-7 (GND)
    		Below 1 Ω
    T21-14 (VC5) or T20-1 (VC5) - Body ground
    		10 kΩ or higher
    T21-15 (CODE) or T20-4 (CODE) - Body ground
    		10 kΩ or higher
    T21-4 (TXCT) or T20-5 (TXCT) - Body ground
    		10 kΩ or higher
    T21-5 (AGND) or T20-7 (GND) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE TRANSPONDER KEY AMPLIFIER