ENTRY AND START SYSTEM Room Oscillator does not Recognize Key

DESCRIPTION

If the room oscillator does not recognize key, either of the following may be the cause: 1) communication between the indoor electrical key oscillator (for front) and electrical key transmitter cannot be performed; or 2) communication between the indoor electrical key oscillator (for rear) and electrical key transmitter cannot be performed.

WIRING DIAGRAM

A01GNNCE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK POWER DOOR LOCK OPERATION


    1. When the master switch assembly's door control switch is operated, check that the locked doors unlock.

      Result
      Result Proceed to
      Door locks operate normally OK
      Door locks do not operate normally NG

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. READ VALUE USING INTELLIGENT TESTER (AUTO ENTRY CANCEL SW)


    1. Using the intelligent tester, read the Data List.

      Entry & Start (Certification ECU)
      Tester Display Measurement Item/Display Normal Condition Diagnostic Note
      Auto Entry Cancel SW Entry function cancel / ON or OFF Mode status is displayed -
      Result
      Result Proceed to
      Entry function is OFF A
      Entry function is ON B

    B

    PERFORM CANCELLATION OF ENTRY KEY CANCEL FUNCTION Click here

    A

  3. CHECK ENTRY AND START SYSTEM

    A01GM4CE01

    1. Remove the battery of the electrical key transmitter.

    2. Touch the LEXUS mark of the key or card key to the engine switch.

    3. Check that the engine switch can be turned on (IG).

      Result
      Result Proceed to
      Engine switch can be turned on (IG) A
      Engine switch cannot be turned on (IG) (for 1UR-FSE) B
      Engine switch cannot be turned on (IG) (for 1UR-FE) C

    B

    GO TO ENTRY AND START SYSTEM (for 1UR-FSE) Click here

    C

    GO TO ENTRY AND START SYSTEM (for 1UR-FE) Click here

    A

  4. CHECK WAVE ENVIRONMENT


    1. Install the battery to the electrical key transmitter.

    2. Bring the electrical key transmitter near the indoor electrical key oscillator (in center console), and perform an engine start check.

      Note

      If the key is brought within 0.2m (0.6 ft.) of the center console, communication is not possible.

    3. Bring the electrical key transmitter near the indoor electrical key oscillator (in rear seat cushion), and perform an engine start check.

      Note

      If the key is brought within 0.2m (0.6 ft.) of the rear seat cushion, communication is not possible.

      Tech Tips


      • When the electrical key transmitter is brought near the indoor electrical key oscillator, the possibility of wave interference decreases, and it can be determined if wave interference is causing the problem symptom.

      • If the inspection result is that the operation check is normal, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

      Result
      Result Proceed to
      Both operation checks fail A
      Operation check is normal B

    B

    AFFECTED BY WAVE INTERFERENCE

    A

  5. KEY DIAGNOSTIC MODE


    1. A01GL0RE01

      Diagnostic mode inspection (front inside oscillator)


      1. Connect the intelligent tester to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the intelligent tester on.

      4. Enter the following menus:


        1. Intelligent tester - Select: Body / Entry & Start / Key Communication Check / Overhead + Front Room /

      5. When the electrical key transmitter is placed on the driver seat or front passenger seat cushion, check that the wireless door lock buzzer sounds.

    2. A01GJSFE01

      Diagnostic mode inspection (rear inside oscillator)


      1. Connect the intelligent tester to the DLC3.

      2. Turn the engine switch on (IG).

      3. Turn the intelligent tester on.

      4. Enter the following menus:


        1. Intelligent tester - Select: Body / Entry & Start / Key Communication Check / Overhead + Rear Room /

      5. When the electrical key transmitter is placed on the rear seat cushion, check that the wireless door lock buzzer sounds.

        Tech Tips

        If the buzzer sounds, it can be determined that the vehicle interior transmitters are operating normally.

        Result
        Result Proceed to
        Front and rear operation check is normal A
        Front and rear operation checks fail B

    A

    REPLACE CERTIFICATION ECU

    B

  6. CHECK HARNESS AND CONNECTOR (INDOOR ELECTRICAL KEY OSCILLATOR - CERTIFICATION ECU)

    A01GM75E12

    1. Disconnect the L74 and S10 oscillator connectors.

    2. Disconnect the L15 ECU connector.

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

      Standard resistance
      for Front
      Tester Connection Condition Specified Condition
      L74-1 (CLG3) - L15-11 (CLG5) Always Below 1 Ω
      L74-3 (CLGB) - L15-12 (CG5B) Always Below 1 Ω
      L74-1 (CLG3) - Body ground Always 10 kΩ or higher
      L74-3 (CLGB) - Body ground Always 10 kΩ or higher
      Standard resistance
      for Rear
      Tester Connection Condition Specified Condition
      S10-1 (CLG4) - L15-13 (CLG6) Always Below 1 Ω
      S10-3 (CLGB) - L15-14 (CG6B) Always Below 1 Ω
      S10-1 (CLG4) - Body ground Always 10 kΩ or higher
      S10-3 (CLGB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK INDOOR ELECTRICAL KEY OSCILLATOR (OPERATION)


    1. Replace the indoor electrical key oscillator with a new one or normally functioning one.

    2. Check that the entry function operates normally.

      OK
      Operates normally

    NG

    REPLACE ELECTRICAL KEY TRANSMITTER Click here

    OK

    END (INDOOR ELECTRICAL KEY OSCILLATOR IS DEFECTIVE)

  8. REPLACE ELECTRICAL KEY TRANSMITTER


    1. Replace the electrical key transmitter with a new one and perform the registration procedure.


    NEXT

  9. CHECK OPERATION


    1. Check the operation of the entry lock function.

      OK
      Operates normally

    NG

    REPLACE CERTIFICATION ECU

    OK

    END (KEY IS DEFECTIVE)