LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2017 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Key System (For Entry Function) - Symptom Tests >> SMART KEY SYSTEM (for Entry Function) >> Room Oscillator does not Recognize Key [08/2015 - 08/2019] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Room Oscillator does not Recognize Key [08/2015 - 08/2019]: Procedure

  1. CHECK SMART KEY SYSTEM (START FUNCTION) 
    1. Remove the battery of the electrical key transmitter (Refer to REPLACEMENT [08/2015 - 08/2019] ).
      GTY724047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. With the brake pedal depressed, touch the TOYOTA mark of the key to the engine switch.
    3. When operating the engine switch, check whether the power source mode changes.

      HINT: 

      • When the electrical key transmitter cannot be verified even though it is in the operating range of the start function, the engine start check can be performed by removing the transmitter battery from the electrical key transmitter and holding the transmitter against the engine switch.
      • When performing the check, if the power source mode changes, there is a problem with key certification inside the cabin.

      OK

      Power source mode changes.

      TEXT IN ILLUSTRATION

      *1 Engine Switch
      *2 Electrical Key Transmitter

    Result: 

    NG 

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) 

    Result: 

    OK 

    See step  2

  2. CHECK WAVE ENVIRONMENT 
    1. Install the battery to the electrical key transmitter (Refer to REPLACEMENT [08/2015 - 08/2019] ).
    2. Move the electrical key transmitter as described below and perform the operation inspection (Refer to OPERATION CHECK [08/2015 - 08/2019] ).
      1. Bring the electrical key transmitter near the indoor No. 1 electrical key antenna (front floor) and perform an engine control system start check.
        NOTE:

        If the key is brought within 0.2 m (0.656 ft.) of the indoor No. 1 electrical key antenna (front floor), communication is not possible.

      2. Bring the electrical key transmitter near the indoor No. 2 electrical key antenna (rear floor) and perform an engine control system start check.
        NOTE:

        If the key is brought within 0.2 m (0.656 ft.) of the indoor No. 2 electrical key antenna (rear floor), communication is not possible.

      3. Bring the electrical key transmitter near the indoor No. 2 electrical key antenna (inside luggage) and perform an engine control system start check.
        NOTE:

        If the key is brought within 0.2 m (0.656 ft.) of the indoor No. 2 electrical key antenna (rear floor), communication is not possible.

        HINT: 

        • When the electrical key transmitter is brought near the indoor electrical key antenna, 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.

        OK

        Engine can be started.

    Result: 

    OK 

    AFFECTED BY WAVE INTERFERENCE 

    Result: 

    NG 

    See step  3

  3. CHECK ELECTRICAL KEY ANTENNAS IN KEY DIAGNOSTIC MODE 
    1. Check the following antennas in the key diagnostic mode (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] ).
      1. Check the indoor No. 1 electrical key antenna (front floor).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

      2. Check the indoor No. 2 electrical key antenna (rear floor).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

      3. Check the indoor No. 2 electrical key antenna (inside luggage).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

        HINT: 

        • If the buzzer sounds, it can be determined that the vehicle interior transmitters are operating normally.
        • It is possible to check which indoor electrical key antenna (front floor, rear floor or inside luggage) is operating by the sounding of the buzzer.
        • If the buzzer does not sound for any indoor electrical key antennas, the certification ECU circuit may have a malfunction.

        OK

        Wireless door lock buzzer sounds.

        RESULT

        Result Proceed to
        Front operation check fails A
        Rear operation check fails B
        Luggage operation check fails C
        Front, rear and luggage operation checks are normal D

    Result: 

    B 

    See step  8

    Result: 

    C 

    See step  12

    Result: 

    D 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (INDOOR NO. 1 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU) 
    1. Disconnect the F77 antenna connector.
    2. Disconnect the F79 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F77-1 (CLG3) - F79-7 (CLG5) Always Below 1 Ω
      F77-3 (CLGB) - F79-8 (CG5B) Always Below 1 Ω
      F77-1 (CLG3) - Body ground Always 10 kΩ or higher
      F77-3 (CLGB) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK CERTIFICATION ECU 
    1. Disconnect the F77 antenna connector.
      GTY710237Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      OK

      Tester Connection Switch Condition Specified Condition
      F77-1 (CLG3) - F77-3 (CLGB) Engine switch off, all doors closed, key not in cabin and lock sensor off → on No pulse generation → pulse generation
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Indoor No. 1 Electrical Key Antenna [Front Floor])

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    OK 

    See step  6

  6. REPLACE INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) 
    1. Temporarily replace the indoor No. 1 electrical key antenna (front floor) with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).

    Result: 

    NEXT 

    See step  7

  7. CHECK ELECTRICAL KEY ANTENNA IN KEY DIAGNOSTIC MODE 
    1. Check the following antenna in the key diagnostic mode (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] ).
      1. Check the indoor No. 1 electrical key antenna (front floor).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

        OK

        Wireless door lock buzzer sounds.

    Result: 

    OK 

    END (INDOOR NO. 1 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE) 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

  8. CHECK HARNESS AND CONNECTOR (INDOOR NO. 2 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU) 
    1. Disconnect the O9 antenna connector.
    2. Disconnect the F79 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O9-1 (CLG4) - F79-24 (CLG6) Always Below 1 Ω
      O9-2 (CLGB) - F79-25 (CG6B) Always Below 1 Ω
      O9-1 (CLG4) - Body ground Always 10 kΩ or higher
      O9-2 (CLGB) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK CERTIFICATION ECU 
    1. Disconnect the O9 antenna connector.
      GTY720387Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      OK

      Tester Connection Switch Condition Specified Condition
      O9-1 (CLG4) - O9-2 (CLGB) Engine switch off, all doors closed, key not in cabin and lock sensor off → on No pulse generation → pulse generation
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Indoor No. 2 Electrical Key Antenna [Rear Floor])

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    OK 

    See step  10

  10. REPLACE INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) 
    1. Temporarily replace the indoor No. 2 electrical key antenna (rear floor) with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).

    Result: 

    NEXT 

    See step  11

  11. CHECK ELECTRICAL KEY ANTENNA IN KEY DIAGNOSTIC MODE 
    1. Check the following antenna in the key diagnostic mode (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] ).
      1. Check the indoor No. 2 electrical key antenna (rear floor).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

        OK

        Wireless door lock buzzer sounds.

    Result: 

    OK 

    END (INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE) 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

  12. CHECK HARNESS AND CONNECTOR (INDOOR NO. 2 ELECTRICAL KEY ANTENNA - CERTIFICATION ECU) 
    1. Disconnect the O14 antenna connector.
    2. Disconnect the F79 ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O14-1 (CLG6) - F79-26 (CLG7) Always Below 1 Ω
      O14-2 (CLGB) - F79-27 (CG7B) Always Below 1 Ω
      O14-1 (CLG6) - Body ground Always 10 kΩ or higher
      O14-2 (CLGB) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. CHECK CERTIFICATION ECU 
    1. Disconnect the O14 antenna connector.
      GTY709013Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      OK

      Tester Connection Switch Condition Specified Condition
      O14-1 (CLG6) - O14-2 (CLGB) Engine switch off, all doors closed, key not in cabin and lock sensor off → on No pulse generation → pulse generation
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Indoor No. 2 Electrical Key Antenna [Inside Luggage])

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    OK 

    See step  14

  14. REPLACE INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY (INSIDE LUGGAGE) 
    1. Temporarily replace the indoor No. 2 electrical key antenna (inside luggage) with a new or normally functioning one (Refer to REMOVAL [08/2015 - ] ).

    Result: 

    NEXT 

    See step  15

  15. CHECK ELECTRICAL KEY ANTENNA IN KEY DIAGNOSTIC MODE 
    1. Check the following antenna in the key diagnostic mode (Refer to SYSTEM DESCRIPTION [08/2015 - 08/2019] ).
      1. Check the indoor No. 2 electrical key antenna (inside luggage).

        When the electrical key transmitter is at the inspection point, check that the wireless door lock buzzer sounds.

        OK

        Wireless door lock buzzer sounds.

    Result: 

    OK 

    END (INDOOR NO. 2 ELECTRICAL KEY ANTENNA ASSEMBLY IS DEFECTIVE) 

    Result: 

    NG 

    REPLACE CERTIFICATION ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

scientia non olet · About LEMON Manuals