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DTC    B2784    Antenna Coil Open / Short

for Preparation Click here


DESCRIPTION

This DTC is stored when there is an open or short in the transponder key coil (built into the power switch).

DTC No.
DTC Detection Condition
Trouble Area
B2784
Transponder key coil is open or shorted.
  1. Wire harness or connector
  2. Power switch
  3. Certification ECU (Smart key ECU assembly)

WIRING DIAGRAM


B219132E14


INSPECTION PROCEDURE

NOTICE:
  1. If the certification ECU (smart key ECU assembly) is replaced, register all the keys and ECU communication ID.*1
  2. If the certification ECU (smart key ECU assembly) is replaced, register all the keys.*2
    1. *1: w/o Airbag Cut-off Switch
    2. *2: w/ Airbag Cut-off Switch

1.CHECK DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs (Click here).

    OK:
    DTC B2784 is not output.



NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)  

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

  1. Disconnect the certification ECU (smart key ECU assembly) connector.



    B203502E06

  1. Disconnect the power switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L62-12 (TXCT) - L43-9 (TXCT)
    		Always
    		Below 1 Ω
    L62-13 (CODE) - L43-10 (CODE)
    		Always
    		Below 1 Ω
    L62-12 (TXCT) - Body ground
    		Always
    		10 kΩ or higher
    L62-13 (CODE) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU (Smart Key ECU Assembly))
    *2
    		Front view of wire harness connector
    (to Power Switch)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.REPLACE POWER SWITCH

  1. Replace the power switch (Click here).


NEXT


4.CHECK DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs (Click here).

    OK:
    DTC B2784 is not output.



NG
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
OK

END (POWER SWITCH WAS DEFECTIVE)