Dtc B2784 Antenna Coil Open / Short

Securities. Lexus Is250, Is220D. Gse20 Ale20
Engine Immobiliser. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)

REPLACE ENGINE SWITCH

CHECK ENGINE START

DTC B2784 Antenna Coil Open / Short


DESCRIPTION

This DTC is output when there is an open or short malfunction in the key coil (built into the engine switch).

DTC No.
DTC Detection Condition
Trouble Area
B2784
Antenna coil is open/shorted
  1. Wire harness
  2. Certification ECU
  3. Engine switch

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Engine Immobiliser.Engine Immobiliser System (For 2Ad-Fhv). Dtc B2784 Antenna Coil Open / Short


INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

  1. Delete the DTC (Click here).

  1. Recheck for DTC (Click here).

    Result:
    Result
    		Proceed to
    B2784 output reoccurs
    		A
    B2784 output does not reoccur
    		B


B
END
A


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


    Lexus Is250, Is220D. Gse20 Ale20.Engine Immobiliser.Engine Immobiliser System (For 2Ad-Fhv). Dtc B2784 Antenna Coil Open / Short

  1. Disconnect the P33 ECU and J31 switch connectors.

  1. Measures the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    P33-9 (CODE) - J31-10 (CODE)
    		Always
    		Below 1 Ω
    P33-8 (TXCT) - J31-9 (TXCT)
    		Always
    		Below 1 Ω
    P33-9 (CODE) - Body ground
    		Always
    		10 kΩ or higher
    P33-8 (TXCT) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE ENGINE SWITCH

  1. Replace the engine switch (Click here).


NEXT


4.CHECK ENGINE START

  1. Check that the engine starts.

    OK:
    The engine starts.


NG
REPLACE CERTIFICATION ECU
OK

END