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

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

DESCRIPTION

This DTC will be stored if the transponder key ECU does not detect that the unlock warning switch is ON even when the ignition switch is ON. Under normal conditions, the unlock warning switch is ON when the ignition switch is ON.

DTC No. DTC Detection Condition Trouble Area
B2780 "Unlock warning switch ON" is not detected when ignition switch is ON.

  • Wire harness or connector

  • Unlock warning switch

  • Transponder key ECU

WIRING DIAGRAM

A0117PGE16

INSPECTION PROCEDURE

Note

If the transponder key ECU is replaced, register the key and ECU - ECM communication ID.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (KEY SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Body / Immobiliser / Data List.

    5. According to the display on the tester, read the Data List.

      Immobiliser
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key SW Unlock warning switch signal/ON or OFF

      ON: Key is in ignition key cylinder

      OFF: No key is in ignition key cylinder

      		 -
      OK
      ON (Key is in ignition key cylinder) appears on the screen.

    NG

    INSPECT UNLOCK WARNING SWITCH Click here

    OK

    REPLACE TRANSPONDER KEY ECU

  2. INSPECT UNLOCK WARNING SWITCH


    1. A0117Y1E01
      Text in Illustration
      *1

      Component without harness connected

      (Unlock Warning Switch)

      Remove the unlock warning switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2

      Switch pushed

      (Key set)

      		 Below 1 Ω

      Switch free

      (Key removed)

      		 10 kΩ or higher

    3. Reinstall the unlock warning switch.


    NG

    REPLACE UNLOCK WARNING SWITCH Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - BODY GROUND)


    1. Disconnect the D18 unlock warning switch connector.

    2. A011AGOE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Unlock Warning Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-1 - Body ground Always Below 1 Ω

    3. Reconnect the unlock warning switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A0118KKE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Unlock Warning Switch)
      *2

      Front view of wire harness connector

      (to Transponder Key ECU)

      Disconnect the D29 transponder key ECU connector.

    2. Disconnect the D18 unlock warning switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D29-3 (KSW) - D18-2 Always Below 1 Ω
      D18-1 - Body ground Always 10 kΩ or higher

    4. Reconnect the transponder key ECU connector.

    5. Reconnect the unlock warning switch connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TRANSPONDER KEY ECU