B2784

ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2784: Antenna Coil Open / Short

DTC B2784 - Antenna Coil Open / Short

DESCRIPTION

This DTC is output if there is an open or short in the key coil (built into the power 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

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTCs.
(b) Recheck for DTCs.
OK:
B2784 output does not recur.
NG -- CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SWITCH)
OK -- USE SIMULATION METHOD TO CHECK
2. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SWITCH)





(a) Disconnect the certification ECU (smart key ECU assembly) and power switch connectors.
(b) 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 POWER SWITCH
(a) Replace the power switch.
NEXT -- Continue to next step.
4. CHECK DTC OUTPUT
(a) Delete the DTCs.
(b) Recheck for DTCs.
OK:
B2784 output does not recur.
NG -- REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK -- END (POWER SWITCH IS DEFECTIVE)