Engine Immobilizer System (w/o Smart Key System)

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/o Smart Key System): 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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When replacing the transponder key ECU assembly, refer to Registration Engine Immobilizer System (w/o Smart Key System).
* 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 Engine Immobilizer System (w/o Smart Key System).

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Check for DTCs Engine Immobilizer System (w/o Smart Key System).

OK:

DTC B2784 is not output.

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

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

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

(a) Disconnect the C39 transponder key ECU assembly connector.

(b) Disconnect the C17 transponder key amplifier connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE TRANSPONDER KEY AMPLIFIER

(a) Temporarily replace the transponder key amplifier with a new or normally functioning one Removal.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Check for DTCs Engine Immobilizer System (w/o Smart Key System).

OK:

DTC B2784 is not output.

NG -- REPLACE TRANSPONDER KEY ECU ASSEMBLY Removal

OK -- END (TRANSPONDER KEY AMPLIFIER IS DEFECTIVE)