IMMOBILISER SYSTEM, Diagnostic DTC:B2784

DTC Code DTC Name
B2784 Antenna Coil Open / Short

DESCRIPTION

When an open or short circuit is detected in the transponder key amplifier coil built into the power switch, the certification ECU (smart key ECU assembly) stores this DTC. This DTC is also stored as a history DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2784 Antenna Coil Open / Short

The transponder key amplifier coil built into the power switch is open (see below) or shorted (determined by communication with certification ECU (smart key ECU assembly)) (1 trip detection logic*).


  • Terminal AGND, VC5, TXCT or CODE circuit is open (including disconnection of the power switch).

  • The transponder key amplifier coil built into the power switch is open.

  • Power switch

  • Wire harness or connector

  • Certification ECU (smart key ECU assembly)

DTC output confirmation operation:


  • With the park (P) selected and the electrical key transmitter sub-assembly held near the power switch, a hybrid control system start operation is performed by pressing and holding the power switch when the transmitter battery is depleted.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Hybrid control system cannot be started when transmitter battery is depleted by holding electrical key transmitter sub-assembly near power switch and pressing and holding power switch with park (P) selected -
Related Data List and Active Test
DTC No. Data List and Active Test
B2784 -

WIRING DIAGRAM

A003NOSE35
*a CODE
*b Power Switch
*c Certification ECU (Smart Key ECU Assembly)

CAUTION / NOTICE / HINT

Note


  • Before replacing the certification ECU (smart key ECU assembly), refer to Service Bulletin.

  • After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips

      Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure.

      OK
      DTC B2784 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  3. CHECK POWER SWITCH (OUTPUT)


    1. Using an oscilloscope, check the waveform.

      A003P11C33
      *a

      Component with harness connected

      (Power Switch)

      		 *b Waveform
      *c Waveform (detail) - -
      Measurement Condition
      Tester Connection Condition Tool Setting Specified Condition
      I53-8 (CODE) - I53-6 (AGND) Power switch off, power switch pressed with electrical key transmitter sub-assembly held near power switch* 1 V/DIV., 20 ms./DIV.

      Pulse generation

      (See waveform)
      2 V/DIV., 100 μs./DIV.

      Pulse generation

      (See waveform (detail))

      • *: Remove the transmitter battery before performing this inspection.

      OK
      The waveform is similar to that shown in the illustration
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE POWER SWITCH Click here

    OK

  4. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Replace the certification ECU (smart key ECU assembly) with a new one.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  5. REGISTER ECU COMMUNICATION ID


    1. Register the ECU communication ID codes.

      Tech Tips

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

    NEXT

  6. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes

      Tech Tips

      Before checking for DTCs, perform "DTC Output Confirmation Operation" procedure.

      OK
      DTC B2784 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) WAS DEFECTIVE)

    NG

    REPLACE POWER SWITCH Click here