SMART KEY SYSTEM (for Entry Function) 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 (indoor electrical key antenna assembly (front floor) or (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).

Tech Tips

  • If the room oscillator does not recognize, the cause of the malfunction may be stored in the certification ECU (smart key ECU assembly) Click here.

  • If the cause of the malfunction is stored in the certification ECU (smart key ECU assembly), the following table is helpful in checking whether or not the malfunction was caused by wave interference.

Radio Wave Interference:
Parameter Name Cause of Problem and Countermeasure
Operating Engine Switch / Key RF Signal Interference

When the engine switch was operated, the electrical key transmitter sub-assembly could not be confirmed due to wave interference. Therefore, the output frequency was switched to the other channel (changed from channel 1 to channel 2 or from channel 2 to channel 1).

If the cause of the malfunction has not been stored but any devices that can cause wave interference in the cabin have been removed and the room oscillator successfully recognizes the key, the possibility of wave interference is high.

WIRING DIAGRAM

A011UD3E29

INSPECTION PROCEDURE

Note

  • The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.

  • When using the Techstream with the engine switch off to troubleshoot:

    Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Entry Function) precaution Click here.

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

  • The indoor electrical key antenna assemblies have an antenna coil between each two CLG terminals.

PROCEDURE

  1. CHECK ENTRY DOOR LOCK OPERATION

    1. Check that the entry lock and unlock functions operate for each door Click here.

      Tech Tips

      If the door control receiver is defective, code verification does not begin in the cabin and the entry functions do not operate.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. CHECK PUSH START FUNCTION

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

      A011S77E01

    2. With the brake pedal depressed, face the logo side of the electrical transmitter sub-assembly towards the engine switch, 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) may be malfunctioning.

      OK
      Engine starts.
      Text in Illustration
      *1 Engine Switch
      *2 Electrical Key Transmitter Sub-assembly
    NG

    GO TO SMART KEY SYSTEM (FOR START FUNCTION) Click here

    OK

  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 smart key system 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 shift lever.

    3. Bring the electrical key transmitter sub-assembly near the No. 2 indoor electrical key antenna assembly (rear floor) and perform a smart key system check Click here

      Tech Tips

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

      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 rear seat cushion.

      Tech Tips

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

      • If the problem only occurs in specific places or at specific times, wave interference may be the cause of the problem. Also, the vehicle may be have the effects of wave interference with the parts installed by the dealer. As a result, when parts have been installed by the dealer, it may be necessary to remove those parts before inspecting the vehicle.

      • 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 electric 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.

      Result
      Result Proceed to
      System cannot be operated A
      System can be operated B
    B

    AFFECTED BY WAVE INTERFERENCE

    A

  4. CHECK KEY DIAGNOSTIC MODE

    1. Check the following antennas in the key diagnostic mode Click here.

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

      Tech Tips

      If the 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.

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

        A011SO2E01
        Text in Illustration
        *a Inspection Point

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

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

        A011V95E01
        Text in Illustration
        *a Inspection Point

        When the electrical key transmitter sub-assembly is at the inspection point, 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.

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

        • If the buzzer does not sound for any indoor electrical key antenna assemblies, the certification ECU (smart key ECU assembly) circuit may be malfunctioning.

        OK
        Wireless door lock buzzer sounds.
        Result
        Result Proceed to
        Front operation check fails A
        Rear operation check fails B
        Front and rear operation checks are normal C
    B

    CHECK HARNESS AND CONNECTOR (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY - CERTIFICATION ECU) Click here

    C

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    A

  5. CHECK HARNESS AND CONNECTOR (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY - CERTIFICATION ECU)

    1. Disconnect the I46 No. 1 indoor electrical key antenna assembly (front floor) connector.

    2. Disconnect the I78 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I46-1 (ANTE5) - I78-3 (CLG5) Always Below 1 Ω
      I46-3 (CLGB) - I78-2 (CG5B) Always Below 1 Ω
      I46-1 (ANTE5) or I78-3 (CLG5) - Body ground Always 10 kΩ or higher
      I46-3 (CLGB) or I78-2 (CG5B) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 1 INDOOR ELECTRICAL KEY ANTENNA)

    1. Disconnect the I46 No. 1 indoor electrical key antenna assembly (front floor) connector.

      A011TVEE29

    2. Connect the I78 certification ECU (smart key ECU assembly) connector.

    3. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      I46-1 (ANTE5) - I46-3 (CLGB)

      Procedure:

      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform)
      Text in Illustration
      *1 Waveform
      *a

      Front view of wire harness connector

      (to No. 1 indoor Electrical Key Antenna [Front Floor])
      *b Within approximately 30 seconds from when the door is closed
      *c After approximately 30 seconds from when the door is closed
    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  7. 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 or known good one Click here.

    NEXT

  8. CHECK KEY DIAGNOSTIC MODE

    1. Check the following antenna in the key diagnostic mode Click here.

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

      Tech Tips

      If the 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.

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

        A011SO2E01

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

        OK
        Wireless door lock buzzer sounds.
        Text in Illustration
        *a Inspection Point
    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (NO. 1 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (FRONT FLOOR) WAS DEFECTIVE)

  9. CHECK HARNESS AND CONNECTOR (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY - CERTIFICATION ECU)

    1. Disconnect the N10 No. 2 indoor electrical key antenna assembly (rear floor) connector.

    2. Disconnect the O1 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N10-1 (ANTE6) - O1-11 (CLG6) Always Below 1 Ω
      N10-3 (CLGB) - O1-10 (CG6B) Always Below 1 Ω
      N10-1 (ANTE6) or O1-11 (CLG6) - Body ground Always 10 kΩ or higher
      N10-3 (CLGB) or O1-10 (CG6B) - Body ground Always 10 kΩ or higher
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO NO. 2 INDOOR ELECTRICAL KEY ANTENNA)

    1. Disconnect the N10 No. 2 indoor electrical key antenna assembly (rear floor) connector.

      A011TVEE30

    2. Connect the O1 certification ECU (smart key ECU assembly) connector.

    3. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      N10-1 (ANTE6) - N10-3 (CLGB)

      Procedure:

      1. Engine switch off

      2. Electrical key transmitter sub-assembly not inside vehicle

      3. Door is open

      4. Door is closed

      5. Within 30 seconds

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform)
      Text in Illustration
      *1 Waveform
      *a

      Front view of wire harness connector

      (to No. 2 indoor Electrical Key Antenna [Rear Floor])
      *b Within approximately 30 seconds from when the door is closed
      *c After approximately 30 seconds from when the door is closed
    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  11. 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 or known good one Click here.

    NEXT

  12. CHECK KEY DIAGNOSTIC MODE

    1. Check the following antenna in the key diagnostic mode Click here.

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

      Tech Tips

      If the 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.

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

        A011V95E01

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

        OK
        Wireless door lock buzzer sounds.
        Text in Illustration
        *a Inspection Point
    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (NO. 2 INDOOR ELECTRICAL KEY ANTENNA ASSEMBLY (REAR FLOOR) WAS DEFECTIVE)