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

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DTC Code DTC Name
B2780 Push Switch / Key Unlock Warning Switch Malfunction
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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*).

  • Wire harness or connector

  • Unlock warning switch assembly

  • Transponder key ECU assembly
  • DTC Output Confirmation Operation:

  • Insert the door control transmitter assembly 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 No. Data List and Active Test
B2780 Key SW
Table 3. *a Unlock Warning Switch Assembly *b Transponder Key ECU Assembly
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WIRING DIAGRAM

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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".

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PROCEDURE


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    INSPECT UNLOCK WARNING SWITCH ASSEMBLY


    1. Remove the unlock warning switch assembly.

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    2. Inspect the unlock warning switch assembly.

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      Result
      Proceed to
      OK
      NG

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


    1. Disconnect the K60 transponder key ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K31-1 - K60-5 (KSW) Always Below 1 Ω
      K31-2 - Body ground Always Below 1 Ω
      K31-1 or K60-5 (KSW) - Other terminals and 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