Click here

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

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

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. Under normal conditions, the unlock warning switch assembly is on when the ignition switch is ON.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2780 The unlock warning switch assembly is not detected as being on when the ignition switch is ON (1 trip detection logic*).

  • Transponder key ECU assembly

  • Unlock warning switch assembly

  • Harness or connector

 Insert the key into the ignition key cylinder.

Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Operation when Malfunction Detected
Engine cannot be started -
Table 2. Related Data List and Active Test
DTC Code Data List and Active Test
B2780 Key SW
Click here

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Note:

  • When replacing the transponder key ECU assembly, refer to the Service Bulletin.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Click here

PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTCs (Click here).


  2. Click here

    CHECK FOR DTC


    1. Check for DTCs (Click here).

      Tip:

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

      OK
      DTC B2780 is not output.

  3. Click here

    INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. Inspect the unlock warning switch assembly (Click here).


  4. Click here

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


    1. Disconnect the E94 unlock warning switch assembly connector.

    2. Disconnect the E96 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
      E94-1 (UN+) - E96-3 (KSW) Always Below 1 Ω
      E94-2 (UN-) - Body ground Always Below 1 Ω
      E94-1 (UN+) - Body ground Always 10 kΩ or higher

  5. Click here

    USE SIMULATION METHOD TO CHECKClick here

  6. Click here

    REPLACE UNLOCK WARNING SWITCH ASSEMBLYClick here

  7. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    REPLACE TRANSPONDER KEY ECU ASSEMBLY