Dtc B2784 Antenna Coil Open / Short

Lexus IS250 IS220d GSE20 ALE20 - ENGINE IMMOBILISER

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 ConditionTrouble Area
B2784Antenna coil is open/shorted
Wire harness
Certification ECU
Engine switch

WIRING DIAGRAM

Dtc B2784 Antenna Coil Open / Short. ENGINE IMMOBILISER. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT

Delete the DTC .

Recheck for DTC .

  • Result:
  • ResultProceed to
    B2784 output reoccursA
    B2784 output does not reoccurB
B
END
A
2.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
Dtc B2784 Antenna Coil Open / Short. ENGINE IMMOBILISER. Lexus IS250 IS220d GSE20 ALE20

Disconnect the P33 ECU and J31 switch connectors.

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

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    P33-9 (CODE) - J31-10 (CODE)AlwaysBelow 1 Ω
    P33-8 (TXCT) - J31-9 (TXCT)AlwaysBelow 1 Ω
    P33-9 (CODE) - Body groundAlways10 kΩ or higher
    P33-8 (TXCT) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.REPLACE ENGINE SWITCH

Replace the engine switch .

NEXT
4.CHECK ENGINE START

Check that the engine starts.

  • OK:
  • The engine starts.
NG
REPLACE CERTIFICATION ECU
OK
END