ENTRY AND START SYSTEM (for Entry Function) All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

DESCRIPTION

When the entry operation and wireless operation door lock function does not operate, a malfunction or wave interference may be occurring in either of the following: 1) the signal communication line between the door control receiver and certification ECU (smart key ECU assembly) (line is used by entry and wireless); or 2) the door control transmitter.

WIRING DIAGRAM

A01ESDGE01

INSPECTION PROCEDURE

Note


  • Before performing the inspection, check that there are no problems related to the "CAN Communication System" and "LIN Communication System".

  • Check that there are no door control transmitters in the vehicle.

  • Before performing the inspection, check that DTC B1242 is not output Click here.

PROCEDURE


  1. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the master switch door control switch is operated, check that the locked doors unlock Click here.

      OK
      Locked doors unlock.

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM Click here

    OK

  2. CHECK DOOR CONTROL TRANSMITTER


    1. When another registered door control transmitter is used, check that the wireless and entry function operates normally Click here.

      Result
      Result Proceed to
      Entry function operates and door control transmitter that did not operate is electrical key transmitter A
      Entry function operates and door control transmitter that did not operate is card key* B
      Entry function does not operate C

      *: for Card Type


    B

    INSPECT CARD KEY BATTERY (VOLTAGE) Click here

    C

    CHECK WAVE ENVIRONMENT Click here

    A

  3. CHECK DOOR CONTROL TRANSMITTER (LED)


    1. Check that the transmitter LED illuminates 3 times when a switch is pressed 3 times.

      Result
      Result Proceed to
      Transmitter LED does not illuminate 3 times when switch is pressed 3 times A
      Transmitter LED illuminates 3 times when switch is pressed 3 times B
      Transmitter LED does not illuminate second or third time C

      Tech Tips

      If the transmitter LED does not illuminate the second or third time, replace the transmitter battery as it is depleted.


    B

    REPLACE DOOR CONTROL TRANSMITTER

    C

    REPLACE TRANSMITTER BATTERY Click here

    A

  4. INSPECT TRANSMITTER BATTERY (VOLTAGE)


    1. Electrical Key Transmitter (w/o Battery Cover):


      1. Remove the battery from the electrical key transmitter that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) or less in diameter including wire sheath) with tape or equivalent to the negative terminal Click here.

        A01EPFG

        Note

        Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

      2. Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.

      3. Using an oscilloscope, measure the voltage according to the value(s) in the table below.

        Tech Tips

        When measuring the battery voltage, while operating the lock switch of a door handle, bring the electrical key transmitter within the entry operating range to perform the measurement. For the entry operating range, refer to System Description Click here.

        A01EQYKE03
        Standard Voltage
        Tester Connection Tool Setting Condition Specified Condition
        Battery positive (+) - Battery negative (-) 0.5 V/DIV., 100 ms/DIV. Engine switch off, all doors closed and lock switch pushed 2.5 to 3.2 V (Refer to the waveform)
    2. A01EN0I

      Electrical Key Transmitter (w/ Battery Cover):


      1. Remove the battery from the electrical key transmitter that does not operate. Attach a lead wire (0.6 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal Click here.

        Note

        Do not wrap the lead wire around a terminal, wedge it between terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

      2. Carefully pull the lead wire out from the position shown in the illustration and install the previously removed transmitter battery.

      3. Using an oscilloscope, measure the voltage according to the value(s) in the table below.

        A01EQ5ZE02

        Tech Tips

        When measuring the battery voltage, while operating the lock switch of a door handle, bring the electrical key transmitter within the entry operating range to perform the measurement. For the entry operating range, refer to System Description Click here.

        Standard Voltage
        Tester Connection Tool Setting Condition Specified Condition
        Battery positive (+) - Battery negative (-) 0.5 V/DIV., 100 ms/DIV. Engine switch OFF, all doors closed and lock switch pushed 2.5 to 3.2 V (Refer to the waveform)

    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

    REPLACE DOOR CONTROL TRANSMITTER

  5. INSPECT CARD KEY BATTERY (VOLTAGE)


    1. Remove the battery from the card key that does not operate. Attach a lead wire to the negative and positive side of the battery with tape or equivalent Click here.

      Note

      Do not wrap the lead wire around a terminal, wedge it between the terminals, or solder it. A terminal may be deformed or damaged, and the battery will not be able to be installed correctly.

    2. A01EN1ZE03

      Using an oscilloscope, measure the voltage according to the value(s) in the table below.

      Tech Tips

      When measuring the battery voltage, while operating the lock switch of a door handle, bring the card key within the entry operating range to perform the measurement. For the entry operating range, refer to System Description Click here.

      Standard Voltage
      Tester Connection Tool Setting Condition Specified Condition
      Battery positive (+) - Battery negative (-) 0.5 V/DIV., 100 ms/DIV. Engine switch OFF, all doors closed and lock switch pushed 2.5 to 3.2 V (Refer to the waveform)

      Note

      Before measuring the battery voltage, make sure that the positive side of the battery is set towards the LEXUS mark side.


    NG

    REPLACE CARD KEY BATTERY Click here

    OK

    REPLACE CARD KEY

  6. CHECK WAVE ENVIRONMENT


    1. Bring the door control transmitter near the door control receiver, and perform a wireless and entry function operation check.

      Tech Tips


      • When the door control transmitter is brought near the door control receiver, 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 problem only occurs in certain locations or 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.

      OK
      Wireless and entry functions operate normally.

    NG

    INSPECT FUSE (IMB) Click here

    OK

    AFFECTED BY WAVE INTERFERENCE

  7. INSPECT FUSE (IMB)


    1. Remove the IMB fuse from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IMB fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - BATTERY)


    1. A01EO6KE01

      Disconnect the E29 ECU connector.

    2. Measure the voltage according to the value(s) in the tables below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E29-1 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DOOR CONTROL RECEIVER AND BODY GROUND)

    A01ES0YE02

    1. Disconnect the L21 receiver connector.

    2. Disconnect the E29 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E29-29 (RCO) - L21-4 (+5) Always Below 1 Ω
      E29-38 (RDA) - L21-5 (DATA) Always Below 1 Ω
      E29-39 (RSSI) - L21-2 (RSSI) Always Below 1 Ω
      E29-17(E) - Body ground Always Below 1 Ω
      L21-1 (GND) - Body ground Always Below 1 Ω
      E29-29 (RCO) or L21-4 (+5) - Body ground Always 10 kΩ or higher
      E29-38 (RDA) or L21-5 (DATA) - Body ground Always 10 kΩ or higher
      E29-39 (RSSI) or L21-2 (RSSI) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK DOOR CONTROL RECEIVER OPERATION


    1. Temporarily replace the door control receiver with a new one Click here.

    2. Check that the wireless and entry functions operate normally.

      OK
      Wireless and entry functions operate normally.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (DOOR CONTROL RECEIVER IS DEFECTIVE)