B2784

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (for Hatchback): B2784: Antenna Coil Open / Short
B2784 - Antenna Coil Open / Short

DESCRIPTION

The antenna coil receives key code signals from the transponder chip in the key grip. The antenna coil is built into the transponder key amplifier, which amplifies the key code signals and outputs the signals to the transponder key ECU assembly.

This DTC is stored when there is an open or short in the antenna coil.





* *: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected





Related Data List and Active Test





INSPECTION PROCEDURE

NOTICE:
* When replacing the transponder key ECU assembly, refer to the Registration Engine Immobiliser System (for Hatchback).
* After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK:

DTC B2784 is not output.

NG -- CHECK TRANSPONDER KEY AMPLIFIER (OUTPUT)

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

3. CHECK TRANSPONDER KEY AMPLIFIER (OUTPUT)

(a) Using an oscilloscope, check the waveform.





(1) Waveform (Reference)

Measurement Condition





OK:

Waveform is output normally (see illustration).

Text in Illustration





NG -- REPLACE TRANSPONDER KEY AMPLIFIER Removal (from 07/2011)
OK -- Continue to next step.

4. REPLACE TRANSPONDER KEY ECU ASSEMBLY

(a) Replace the transponder key ECU assembly Removal (from 07/2011).

NEXT -- Continue to next step.

5. REGISTER KEY

(a) Reregister the key Engine Immobiliser System (for Hatchback).

NEXT -- Continue to next step.

6. REGISTER ECU COMMUNICATION ID

(a) Register the ECU communication ID Engine Immobiliser System (for Hatchback).

NEXT -- Continue to next step.

7. CLEAR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

8. CHECK FOR DTC

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

OK:

DTC B2784 is not output.

NG -- REPLACE TRANSPONDER KEY AMPLIFIER Removal (from 07/2011)

OK -- END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)