IMMOBILISER SYSTEM(w/o Smart Entry and Start System), Diagnostic DTC:B2780

DTC Code DTC Name
B2780 Push Switch / Key Unlock Warning Switch Malfunction

DESCRIPTION

This DTC is stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is on even when the ignition switch is ON.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2780 Push Switch / Key Unlock Warning Switch Malfunction The unlock warning switch assembly is not detected as being on when the ignition switch is ON (1 trip detection logic*).

  • Harness or connector

  • Unlock warning switch assembly

  • Transponder key ECU assembly

    DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder.

Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Related Data List and Active Test
DTC No. Data List and Active Test
B2780 Key SW

WIRING DIAGRAM

B003N0PE06
*a Unlock Warning Switch Assembly
*b Transponder Key ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the transponder key ECU assembly is replaced, refer to Service Bulletin.

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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Immobiliser > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Immobiliser > Trouble Codes

      Tech Tips

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

      OK
      DTC B2780 is not output.
      Result
      Result Proceed to
      B2780 is not output A
      B2780 is output B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. Remove the unlock warning switch assembly.

      Click here

    2. Inspect the unlock warning switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE UNLOCK WARNING SWITCH ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - TRANSPONDER KEY ECU ASSEMBLY AND BODY GROUND)


    1. Disconnect the G136 unlock warning switch assembly connector.

    2. Disconnect the G127 transponder key ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G136-1 - G127-3 (KSW) Always Below 1 Ω
      G136-2 - Body ground Always Below 1 Ω
      G136-1 - Body ground Always 10 kΩ or higher
      G127-3 (KSW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLY

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR