PUSH-BUTTON START Room Oscillator does not Recognize Key

DESCRIPTION

If code verification cannot be performed in the vehicle interior, there may be problems with the communication between the vehicle (No. 1 indoor electrical key antenna assembly (front floor) or No. 2 indoor electrical key antenna assembly (rear floor)) and electrical key transmitter sub-assembly, or the certification ECU (smart key ECU assembly) may be malfunctioning. When the electrical key transmitter sub-assembly is brought into the vehicle, verification of the key ID code transmitted from the electrical key transmitter sub-assembly and the key ID code stored in the certification ECU (smart key ECU assembly) is performed. If verification cannot be performed or the codes do not match, the engine switch cannot be turned on (IG) and the engine cannot be started.

When a door is unlocked and the electrical key transmitter sub-assembly is brought into the vehicle, the certification ECU (smart key ECU assembly) activates the indoor electrical key antenna assembly which transmits radio waves to detect the electrical key transmitter sub-assembly. If the electrical key transmitter sub-assembly recognizes that it is in the detection area, it responds with the key ID code. This information is received by the indoor electrical key antenna and then sent to the certification ECU (smart key ECU assembly).

WIRING DIAGRAM

A01QCMFE04
for LHD
*a No. 1 Indoor Electrical Key Antenna Assembly (Front Floor)
*b No. 2 Indoor Electrical Key Antenna Assembly (Rear Floor)
*c Certification ECU (Smart Key ECU Assembly)
A01QCMFE05
for RHD
*a No. 1 Indoor Electrical Key Antenna Assembly (Front Floor)
*b No. 2 Indoor Electrical Key Antenna Assembly (Rear Floor)
*c Certification ECU (Smart Key ECU Assembly)

CAUTION / NOTICE / HINT

Note


  • The smart push-button start uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart push-button start after confirming that the communication systems are functioning properly.

    Click here

  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • Before replacing the certification ECU (smart key ECU assembly), refer to smart push-button start Precaution.

    Click here

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

  • The indoor electrical key antenna assemblies have an antenna coil between each terminal.

  • The electrical key and TPMS receiver assembly is also related to interior verification.

PROCEDURE


  1. CHECK START OPERATION


    1. Using another registered electrical key transmitter sub-assembly, check that the engine starts.

      Result
      Result Proceed to
      Engine can be started A
      Engine cannot be started B

    A
    B
  2. CHECK PUSH-BUTTON START FUNCTION


    1. Remove the transmitter battery of the electrical key transmitter sub-assembly.

      Click here

    2. A01QAWBC02
      *1 Engine Switch
      *2 Electrical Key Transmitter Sub-assembly

      With the brake pedal depressed, hold the transmitter near the engine switch and then press the engine switch.

    3. When operating the engine switch, check whether the engine starts.

      Tech Tips


      • When the electrical key transmitter sub-assembly cannot be verified even though it is inside the detection area, the engine start check can be performed by removing the transmitter battery from the electrical key transmitter sub-assembly and holding the electrical key transmitter sub-assembly near the engine switch.

      • If the engine cannot be started when performing this inspection, the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upr bracket assembly) may be malfunctioning.

      Result
      Result Proceed to
      Engine can be started A
      Engine cannot be started B

    B
    A
  3. CHECK WAVE ENVIRONMENT


    1. Install the transmitter battery to the electrical key transmitter sub-assembly.

      Click here

    2. Bring the electrical key transmitter sub-assembly near the No. 1 indoor electrical key antenna assembly (front floor) and perform a push-button start check.

      Click here

      Note

      Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the No. 1 indoor electrical key antenna assembly (front floor).

      Click here

    3. Bring the electrical key transmitter sub-assembly near the No. 2 indoor electrical key antenna assembly (rear floor) and perform a push-button start check.

      Click here

      Tech Tips

      Check that the customize status of the "Ignition Available Area" has been "All".

      Click here

      Note

      Communication may not be possible if the electrical key transmitter sub-assembly is within 0.2 m (0.656 ft.) of the center of the No. 2 indoor electrical key antenna assembly (rear floor).

      Click here

      Tech Tips


      • As the effect of wave interference decreases by moving the electrical key transmitter sub-assembly close to each indoor electrical key antenna assembly, it may be possible to check whether wave interference is the cause of the problem.

      • If the inspection result is that the problem only occurs in certain locations or at certain times of day, the possibility of wave interference is high. Also, added vehicle components may cause wave interference. If installed, remove them and perform the operation check.

      • There may be wave interference if the vehicle is near broadcasting antennas, large video displays, wireless garage door opener systems, wireless security cameras, home security systems, etc. In this case, move the vehicle to a different location and check if there is any improvement.

      • If a tool for checking radio waves, such as a signal strength meter, is available, move around the area while observing both the LF band (used by the vehicle antenna to form the detection area) and RF band (used by the electrical key transmitter sub-assembly for transmission) to check for locations where there is wave interference.

      OK
      The engine starts when the electrical key transmitter sub-assembly is held near each indoor electrical key antenna assembly and the engine switch is pressed.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  4. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Entry&Start > Trouble Codes
      OK
      DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. CHECK KEY DIAGNOSTIC MODE


    1. Check the following antennas in key diagnostic mode.


      Body Electrical > Entry&Start > Utility
      Tester Display
      Communication Check(Key Diag Mode)
    2. Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.


      1. B002ERMC01
        *a Inspection Point

        Check the No. 1 indoor electrical key antenna assembly (front floor):

        When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

        Tech Tips


        • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

        • If the wireless buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

      2. B002CGZC01
        *a Inspection Point

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

        When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

        Tech Tips


        • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

        • If the wireless buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

      Tech Tips


      • It is possible to check which indoor electrical key antenna assembly (front floor or rear floor) is operating by the sounding of the wireless buzzer.

      • When the wireless buzzer sounds for all indoor electrical key antenna assemblies, they can be judged as operating properly and a malfunction in the certification ECU (smart key ECU assembly), which performs verification, is suspected.

      • When the wireless buzzer does not sound for all indoor electrical key antenna assemblies, it can be judged that the certification ECU (smart key ECU assembly), which controls the indoor electrical key antenna assemblies, is malfunctioning.

      Result
      Result Proceed to
      The wireless buzzer sounds/does not sound for all indoor electrical key antenna assemblies A
      The wireless buzzer does not sound for only the No. 1 indoor electrical key antenna assembly (front floor) B
      The wireless buzzer does not sound for only the No. 2 indoor electrical key antenna assembly (rear floor) C

    A
    C
    B
  6. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))


    1. Disconnect the K74 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the K44 No. 1 indoor electrical key antenna assembly (front floor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K74-3 (CLG5) - K44-1 (ANTE5) Always Below 1 Ω
      K74-2 (CG5B) - K44-3 (CLGB) Always Below 1 Ω
      K74-3 (CLG5) or K44-1 (ANTE5) - Body ground Always 10 kΩ or higher
      K74-2 (CG5B) or K44-3 (CLGB) - Body ground Always 10 kΩ or higher
    4. Reconnect the K74 certification ECU (smart key ECU assembly) connector.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR))


    1. A01QAZ2C40
      *a

      Front view of wire harness connector

      (to No. 1 Indoor Electrical Key Antenna Assembly (Front Floor))

      *b Waveform 1
      *c For 30 seconds after closing any door using the door outside handle
      *d 30 seconds or more have elapsed after closing any door using the door outside handle

      Using an oscilloscope, check the waveform.

      OK
      Tester Connection Condition Tool Setting Specified Condition
      K44-1 (ANTE5) - K44-3 (CLGB)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform 1)

      Result
      Proceed to
      OK
      NG

    NG
    OK
  8. REPLACE NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR)


    1. Temporarily replace the No. 1 indoor electrical key antenna assembly (front floor) with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  9. CHECK KEY DIAGNOSTIC MODE


    1. Check the following antenna in key diagnostic mode.


      Body Electrical > Entry&Start > Utility
      Tester Display
      Communication Check(Key Diag Mode)
    2. Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.


      1. B002ERMC01
        *a Inspection Point

        Check the No. 1 indoor electrical key antenna assembly (front floor):

        When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

        Tech Tips


        • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

        • If the wireless buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

        OK
        Wireless buzzer sounds.
      Result
      Proceed to
      OK
      NG

    OK
    NG
  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR))


    1. Disconnect the T1*1 or U1*2 certification ECU (smart key ECU assembly) connector.


      • *1: for LHD

      • *2: for RHD

    2. Disconnect the U10 No. 2 indoor electrical key antenna assembly (rear floor) connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      T1-11 (CLG6) - U10-1 (ANTE6) Always Below 1 Ω
      T1-10 (CG6B) - U10-3 (CLGB) Always Below 1 Ω
      T1-11 (CLG6) or U10-1 (ANTE6) - Body ground Always 10 kΩ or higher
      T1-10 (CG6B) or U10-3 (CLGB) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      U1-11 (CLG6) - U10-1 (ANTE6) Always Below 1 Ω
      U1-10 (CG6B) - U10-3 (CLGB) Always Below 1 Ω
      U1-11 (CLG6) or U10-1 (ANTE6) - Body ground Always 10 kΩ or higher
      U1-10 (CG6B) or U10-3 (CLGB) - Body ground Always 10 kΩ or higher
    4. Reconnect the T1*1 or U1*2 certification ECU (smart key ECU assembly) connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG
    OK
  11. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR))


    1. A01QAZ2C41
      *a

      Front view of wire harness connector

      (to No. 2 Indoor Electrical Key Antenna Assembly (Rear Floor))

      *b Waveform 1
      *c For 30 seconds after closing any door using the door outside handle
      *d 30 seconds or more have elapsed after closing any door using the door outside handle

      Using an oscilloscope, check the waveform.

      OK
      Tester Connection Condition Tool Setting Specified Condition
      U10-1 (ANTE6) - U10-3 (CLGB)

      Procedure:


      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Within 30 seconds of closing any door using the door outside handle

      2 V/DIV., 500 ms./DIV.

      Pulse generation

      (See waveform 1)

      Result
      Proceed to
      OK
      NG

    NG
    OK
  12. REPLACE NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR)


    1. Temporarily replace the No. 2 indoor electrical key antenna assembly (rear floor) with a new one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  13. CHECK KEY DIAGNOSTIC MODE


    1. Check the following antenna in key diagnostic mode.


      Body Electrical > Entry&Start > Utility
      Tester Display
      Communication Check(Key Diag Mode)
    2. Select either channel 1 or channel 2 and inspect the diagnostic mode for each channel.


      1. B002CGZC01
        *a Inspection Point

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

        When the electrical key transmitter sub-assembly is at either inspection point, check that the wireless buzzer sounds.

        Tech Tips


        • Select either channel 1 or channel 2 and inspect key diagnostic mode for each channel.

        • If the wireless buzzer sounds with [CH1] displayed but not with [CH2], the electrical key transmitter sub-assembly cannot be detected by channel 2 due to a malfunction, such as wave interference.

        OK
        Wireless buzzer sounds.
      Result
      Proceed to
      OK
      NG

    OK
    NG