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Home >> Lexus >> 2008 >> LX 570 >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Theft Deterrent / Keyless Entry >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Entry Function) >> Room Oscillator does not Recognize Key >> Inspection Procedure

Inspection Procedure

NOTE:
  • Before performing the inspection, check that there are no problems related to the "CAN Communication System" and "LIN Communication System".
  • When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
  1. CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (ENTRY FUNCTION) 
    1. Check that the entry lock and unlock function can be operated at each door (See OPERATION CHECK  )

    NG: Go to DTC OF OTHER COMPONENTS (PROCEED TO PROBLEM SYMPTOM FLOWCHART FOR EACH DOOR)  (See PROBLEM SYMPTOMS TABLE  )

    OK: Go to next step 

  2. CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START (START FUNCTION) 
    1. Remove the battery of the electrical key transmitter (See TRANSMITTER BATTERY ).
    2. With the brake pedal depressed, touch the LEXUS mark of the key to the engine switch.
    3. When operating the engine switch, check whether the power source mode changes.

      OK: 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.
        Fig 1: Identifying Engine Switch
        G05763731Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to SMART ACCESS SYSTEM WITH PUSH-BUTTON START (Power Source Mode does not Change)  (See POWER SOURCE MODE DOES NOT CHANGE  )

    OK: Go to next step 

  3. CHECK WAVE ENVIRONMENT 
    1. Install the battery to the electrical key transmitter (See TRANSMITTER BATTERY ).
    2. Bring the electrical key transmitter near the indoor electrical key antenna (in center console), and perform an engine control system start check.
      NOTE: If the key is brought within 0.2 m (0.656 ft.) of the center console, communication is not possible.

      OK: Engine starts. 

    3. Bring the electrical key transmitter near the indoor electrical key antenna (in rear No. 1 seat cushion), and perform an engine control system start check.
      NOTE: If the key is brought within 0.2 m (0.656 ft.) of the rear No. 1 seat cushion, communication is not possible.

      OK: Engine starts. 

    4. Bring the electrical key transmitter near the indoor electrical key antenna (in rear No. 2 seat cushion), and perform an engine control system start check.
      NOTE: If the key is brought within 0.2 m (0.656 ft.) of the rear No. 2 seat cushion, 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 starts. 

    NG: Go to step 4 

    OK: AFFECTED BY WAVE INTERFERENCE 

  4. KEY DIAGNOSTIC MODE 
    1. Diagnostic mode inspection (indoor electrical key antenna [for Front Floor]).
      1. Connect the Techstream to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn the Techstream on.
      4. Enter the following menus: Body Electrical / Smart Access / Smart 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.
        Fig 2: Identifying Distance Range Of Indoor Electrical Key Antenna - For Front Floor
        G05763638Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Diagnostic mode inspection (indoor electrical key antenna [for Rear Floor]).
      1. Connect the Techstream to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn the Techstream on.
      4. Enter the following menus: Body Electrical / Smart Access / Smart Communication Check / Overhead + Rear Room.
      5. When the electrical key transmitter is placed on the rear no. 1 seat cushion, check that the wireless door lock buzzer sounds
        Fig 3: Identifying Distance Range Of Indoor Electrical Key Antenna - For Rear Floor
        G05763639Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Diagnostic mode inspection (indoor electrical key antenna [for Luggage Compartment]).
      1. Connect the Techstream to the DLC3.
      2. Turn the engine switch on (IG).
      3. Turn the Techstream on.
      4. Enter the following menus' Body Electrical / Smart Access / Smart Communication Check / Overhead + Back Door (inside) Room.
      5. When the electrical key transmitter is placed on the rear no. 2 seat cushion, check that the wireless door lock buzzer sounds.
        Fig 4: Identifying Distance Range Of Indoor Electrical Key Antenna - For Luggage Compartment
        G05763640Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        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 and luggage compartment) is operating by sounding the buzzer.
        • If the buzzer does not sound for any indoor electrical key antennas, the certification ECU (smart key ECU assembly) circuit may have a malfunction.

        Result 

        RESULT CHART

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

    B:  Go to step  7

    C:  Go to step  9

    D: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)  (See REMOVAL  )

    A: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - INDOOR ELECTRICAL KEY ANTENNA) 
    Fig 5: Identifying Smart Key ECU Assembly Connector Terminal E29 And Indoor Electrical Key Antenna Connector Terminal E96
    G05763735Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E29 ECU connector.
    2. Disconnect the E96 antenna connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      E96-1 (CLG3) - E29-11 (CLG5) Always Below 1 Ω
      E96-3(CLGB) - E29-12 (CG5B) Always Below 1 Ω
      E96-1 (CLG3) - Body ground Always 10 kΩ or higher
      E96-3 (CLGB) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK INDOOR ELECTRICAL KEY ANTENNA (for Front Floor) 
    Fig 6: Identifying E29 ECU Connector And E96 Antenna Connector
    G05630937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using an oscilloscope, check the waveform.

      OK 

      WAVEFORM REFERENCE CHART

      Terminal No (Symbol) Tool Setting Switch Condition Specified Condition
      E29-11 (CLG5) - E29-12 (CG5B) 2 V/DIV., 2 μsec./ DIV. (Reference) Engine switch on (IG) Waveform is as shown in the illustration

    NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)  (See REMOVAL  )

    OK: REPLACE INDOOR ELECTRICAL KEY ANTENNA (for Front Floor)  (See REMOVAL  )

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - INDOOR ELECTRICAL KEY ANTENNA) 
    Fig 7: Identifying Smart Key ECU Assembly Connector Terminal E29 And Indoor Electrical Key Antenna Connector Terminal L8
    G05630938Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E29 ECU connector.
    2. Disconnect the L8 antenna connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      L8-1 (CLG4) - E29-13 (CLG6) Always Below 1 Ω
      L8-2 (CLGB) - E29-14 (CG6B) Always Below 1 Ω
      L8-1 (CLG4) - Body ground Always 10 kΩ or higher
      L8-2 (CLGB) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK INDOOR ELECTRICAL KEY ANTENNA (for Rear Floor) 
    Fig 8: Identifying E29 ECU Connector
    G05630939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using an oscilloscope, check the waveform.

      OK 

      WAVEFORM REFERENCE CHART

      Terminal No (Symbol) Tool Setting Switch Condition Specified Condition
      E29-13 (CLG6) - E29-14 (CG6B) 2 V/DIV., 2 μsec / DIV. (Reference) Engine switch on (IG) Waveform is as shown in the illustration

    NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)  (See REMOVAL  )

    OK: REPLACE INDOOR ELECTRICAL KEY ANTENNA (for Rear Floor)  (See REMOVAL  )

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - INDOOR ELECTRICAL KEY ANTENNA) 
    Fig 9: Identifying Smart Key ECU Assembly Connector Terminal E29 And Indoor Electrical Key Antenna Connector Terminal L9
    G05630940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the E29 ECU connector.
    2. Disconnect the L9 antenna connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      L9-1 (CLG6) - E29-15 (CLG7) Always Below 1 Ω
      L9-2 (CLGB) - E29-16 (CG7B) Always Below 1 Ω
      L9-1 (CLG6) - Body ground Always 10 kΩ or higher
      L9-2 (CLGB) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK INDOOR ELECTRICAL KEY ANTENNA (for Luggage Compartment) 
    Fig 10: Identifying Smart Key ECU Assembly Connector Terminal E29 (For Luggage Compartment)
    G05630941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Using an oscilloscope, check the waveform.

      OK 

      WAVEFORM REFERENCE CHART

      Terminal No. (Symbol) Tool Setting Switch Condition Specified Condition
      E29-15 (CLG7) - E29-16 (CG7B) 2 V/DIV., 2 μsec / DIV (Reference) Engine switch on (IG) Waveform is as shown in the illustration

    NG: REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)  (See REMOVAL  )

    OK: REPLACE INDOOR ELECTRICAL KEY ANTENNA (for Luggage Compartment)  (See REMOVAL  )

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