Engine Immobilizer System (w/ Smart Key System)

THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM (w/ Smart Key System): B2784: Antenna Coil Open / Short
B2784 - Antenna Coil Open / Short

DESCRIPTION

When an open or short circuit is detected in the transponder key amplifier coil built into the engine switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a past DTC.





* *: 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:
* Before replacing the certification ECU (smart key ECU assembly), refer to Registration Engine Immobilizer System (w/ Smart Key System).
* The certification ECU (smart key ECU assembly) outputs a fixed 5 V power source voltage through a resistance from terminal CODE. The engine switch grounds or does not ground this power source voltage accordingly.
* The certification ECU (smart key ECU assembly) outputs a fixed 5 V power source voltage through a resistance and transistor. The engine switch grounds or does not ground this signal accordingly.
* 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/ Smart Key System).

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Perform the operation that fulfills the DTC output confirmation operation.

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

OK:

DTC B2784 is not output.

NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)

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

3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)

(a) Disconnect the C35 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the C15 engine switch 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 ENGINE SWITCH

(a) Temporarily replace the engine switch with a new or normally functioning one Removal.

NEXT -- Continue to next step.

5. CLEAR DTC

(a) Clear the DTCs Engine Immobilizer System (w/ Smart Key System).

NEXT -- Continue to next step.

6. CHECK FOR DTC

(a) Perform the operation that fulfills the DTC output confirmation operation.

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

OK:

DTC B2784 is not output.

NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Removal

OK -- END (ENGINE SWITCH IS DEFECTIVE)