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### 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

## 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)

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