Engine Immobiliser System (w/ Smart Key System)

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

DTC B2784 - Antenna Coil Open / Short

DESCRIPTION

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






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: If the certification ECU (smart key ECU assembly) is replaced, register the key and ECU communication ID Engine Immobiliser System (W/ Smart Key System).

PROCEDURE

1. CHECK DTC OUTPUT
(a) Clear the DTCs Engine Immobiliser System (w/ Smart Key System).
(b) Recheck for DTCs.
OK:
B2784 is not reoutput.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ENGINE SWITCH)
(a) Disconnect the certification ECU (smart key ECU assembly) connector.




(b) Disconnect the 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.
3. REPLACE ENGINE SWITCH
(a) Replace the engine switch Removal.
NEXT -- Continue to next step.
4. CHECK DTC OUTPUT
(a) Clear the DTCs Engine Immobiliser System (w/ Smart Key System).
(b) Recheck for DTCs.
OK:
B2784 is not reoutput.
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK -- END (ENGINE SWITCH IS DEFECTIVE)