SMART KEY SYSTEM (for Entry Function) Driver Side Door Entry Lock and Unlock Functions do not Operate

DESCRIPTION

If the entry lock and unlock functions do not operate for the driver door only, the request code may not be being transmitted from the driver door or the front door outside handle assembly LH (for driver door) (touch sensor) may be malfunctioning. If the entry functions for other doors operate properly, communication between the electrical key transmitter sub-assembly and door control receiver is normal. In this case, there may be a problem with request code transmission (communication between the certification ECU (smart key ECU assembly) and front door outside handle assembly LH (for driver door) [driver door electrical key antenna]), or there may be wave interference.

Tech Tips


  • If the driver door entry lock and unlock functions do not operate, 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
Lock / Key RF Signal Interference

When entry lock operation was performed, the electrical key transmitter sub-assembly could not be confirmed due to wave interference.

If the cause of the malfunction has not been stored but the car has been moved and an entry lock operation has been successfully performed, the possibility of wave interference is high.
Unlock / Key RF Signal Interference

When entry unlock operation was performed, the electrical key transmitter sub-assembly could not be confirmed due to wave interference.

If the cause of the malfunction has not been stored but the car has been moved and an entry unlock operation has been successfully performed, the possibility of wave interference is high.

WIRING DIAGRAM

A01I3FOE17

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 power 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.

  • Check that there are no electrical key transmitter sub-assemblies in the vehicle.

  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output Click here.

  • 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".

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation Click here.

      OK
      Door locks operate normally.

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. CHECK WAVE ENVIRONMENT


    1. A01I5IQE01
      Text in Illustration
      *a Approximately 0.3 m (0.984 ft.)

      Bring the electrical key transmitter sub-assembly approximately 0.3 m (0.984 ft.) from the front door outside handle assembly LH (for driver door) and perform an entry function check Click here.

      Note

      If the electrical key transmitter sub-assembly is brought within 0.2 m (0.656 ft.) of the door handle, communication may not be possible.

      Tech Tips

      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.

      Result
      Result Proceed to
      Entry function does not operate normally. A
      Entry function operates normally. B

    B

    AFFECTED BY WAVE INTERFERENCE

    A

  3. CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH - CERTIFICATION ECU)


    1. Disconnect the W1 front door outside handle assembly LH (for driver door) connector.

    2. Disconnect the I86 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
      W1-3 (ANT2) - I86-4 (CG1B) Always Below 1 Ω
      W1-6 (ANT1) - I86-5 (CLG1) Always Below 1 Ω
      W1-5 (B) - I86-15 (POS1) Always Below 1 Ω
      W1-2 (GND) - Body ground Always Below 1 Ω
      W1-3 (ANT2) or I86-4 (CG1B) - Body ground Always 10 kΩ or higher
      W1-6 (ANT1) or I86-5 (CLG1) - Body ground Always 10 kΩ or higher
      W1-5 (B) or I86-15 (POS1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (OUTPUT TO DRIVER DOOR ELECTRICAL KEY ANTENNA)


    1. A01I2FRE33
      Text in Illustration
      *1 Waveform
      *a

      Front view of wire harness connector

      (to Front Door Outside handle assembly LH (for driver door))

      Disconnect the W1 front door outside handle assembly LH (for driver door) connector.

    2. Connect the I86 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      W1-5 (B) - W1-2 (GND) Power switch off → on (IG) 9 to 12 V → Below 2 V

    4. Using an oscilloscope, check the waveform.

      OK
      Tester Connection Switch Condition Tool Setting Specified Condition
      W1-3 (ANT2) - W1-6 (ANT1)

      Procedure:


      1. Power switch off

      2. Electrical key transmitter sub-assembly brought outside vehicle

      3. All doors closed

      4. Electrical key transmitter sub-assembly not inside vehicle

      5. Electrical key transmitter sub-assembly brought outside detection area*

      6. All doors locked through wireless operation

      		 2 V/DIV., 500 ms/DIV. Pulse generation (See waveform)

      • *: For details about the areas that are outside the entry function detection area, refer to Operation check Click here.


    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

  5. REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR)


    1. Temporarily replace the front door outside handle assembly LH (for driver door) with a new or known good one Click here.


    NEXT

  6. CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR) (OPERATION)


    1. Check that the entry functions operate normally Click here.

      OK
      Entry functions operate normally.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    END (FRONT DOOR OUTSIDE HANDLE ASSEMBLY LH (FOR DRIVER DOOR) WAS DEFECTIVE)