WIRELESS DOOR LOCK CONTROL SYSTEM (w/ Smart Entry and Start System) Only Wireless Control Function is Inoperative

DESCRIPTION

If the wireless door lock control functions do 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) (the line used for wireless operation): or 2) the electrical key transmitter sub-assembly.

WIRING DIAGRAM

A01EWSAE02

INSPECTION PROCEDURE

Note


  • 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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • When replacing the certification ECU (smart key ECU assembly) or electrical key transmitter sub-assembly, refer to Service Bulletin.

  • Troubleshooting should be started after confirming that the customize status of the wireless control function is ON Click here.

  • Door control receiver has a constant voltage (5 V) supply circuit connected to terminal "+5".

PROCEDURE


  1. SYSTEM CHECK


    1. Check the vehicle specification.

      Result
      Result Proceed to
      w/o Entry Function A
      w/ Entry Function B

    B

    GO TO PROBLEM SYMPTOMS TABLE Click here

    A

  2. INSPECT BATTERY VOLTAGE


    1. Measure the voltage of the battery.

      Standard voltage
      11 to 14 V

      Tech Tips

      It may be possible to tell whether the battery is depleted by operating the horn.


      • If the voltage is below 11 V, recharge or replace the battery before proceeding.


    NEXT

  3. CHECK FOR DTC


    1. Open the driver door using the mechanical key built into the electrical key transmitter sub-assembly.

    2. Connect the intelligent tester and check for DTCs Click here.

      Tech Tips

      When using the intelligent tester with the engine switch off to troubleshoot: Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

      OK
      DTCs are not output.

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  4. CHECK POWER DOOR LOCK CONTROL SYSTEM


    1. When the door control switch of the multiplex network master switch assembly on the driver door 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

  5. CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY


    1. When a known good registered electrical key transmitter sub-assembly is used, check that the wireless functions operate normally.

      Result
      Result Proceed to
      Wireless door LOCK/UNLOCK function operates normally with a known good electrical key transmitter sub-assembly. A
      Wireless door LOCK/UNLOCK function does not operate B

    B

    CHECK WAVE ENVIRONMENT Click here

    A

  6. CHECK ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY (LED)


    1. Press and hold the lock switch of the electrical key transmitter sub-assembly for 5 seconds and check the number of times that the electrical key transmitter sub-assembly LED flashes.

      Result
      Result Proceed to
      Electrical key transmitter sub-assembly LED does not flash when switch is pressed and held A
      Electrical key transmitter sub-assembly LED flashes 3 times or more when switch is pressed and held B
      Electrical key transmitter sub-assembly LED flashes once or twice but not third time C

      Tech Tips


      • The key sends voltage information to the certification ECU (smart key ECU assembly) when it is being used. The certification ECU (smart key ECU assembly) displays "Yes" for the "Key Low Battery" item of the Data List when this voltage information indicates 2.1 V or less Click here.

      • Even if the key battery is depleted, it is still possible to start the engine by holding the key against the engine switch, depressing the brake pedal and pressing the engine switch.


    B

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

    C

    REPLACE TRANSMITTER BATTERY Click here

    A

  7. INSPECT TRANSMITTER BATTERY (VOLTAGE)


    1. Inspect the transmitter battery (for Type A)


      1. Remove the transmitter battery from the electrical key transmitter sub-assembly that does not operate Click here.

        A01EVCNE04

      2. Attach a lead wire (0.60 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal.

        Text in Illustration
        *1 Lead Wire

        Note

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

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

      4. Measure the voltage of the transmitter battery.

        Note

        When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged.

        Tech Tips


        • Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the electrical key transmitter sub-assembly.

        • Perform the measurement with the transmitter battery at room temperature.

        • The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes" Click here.

        A01ESQ8
        Standard Voltage
        Tester Connection Condition Specified Condition
        Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and LOCK or UNLOCK switch pressed 2.2 to 3.2 V

    2. Inspect the transmitter battery (for Type B)


      1. Remove the transmitter battery from the electrical key transmitter sub-assembly that does not operate Click here.

        A01EUCDE03

      2. Attach a lead wire (0.60 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal.

        Text in Illustration
        *1 Lead Wire

        Note

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

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

      4. Measure the voltage of the transmitter battery.

        Note

        When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged.

        Tech Tips


        • Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the electrical key transmitter sub-assembly.

        • Perform the measurement with the transmitter battery at room temperature.

        • The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes" Click here.

        A01EVKC
        Standard Voltage
        Tester Connection Condition Specified Condition
        Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and LOCK or UNLOCK switch pressed 2.2 to 3.2 V

    3. Inspect the transmitter battery (for Type C)


      1. Remove the transmitter battery from the electrical key transmitter sub-assembly that does not operate Click here.

        A01EW1DE07

      2. Attach a lead wire (0.60 mm (0.0236 in.) in diameter or less including wire sheath) with tape or equivalent to the negative terminal.

        Text in Illustration
        *1 Lead Wire

        Note

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

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

      4. Measure the voltage of the transmitter battery.

        Note

        When replacing the transmitter battery, before starting work, remove static electricity that has built up in the body by touching, for example, the vehicle to prevent the electrical key transmitter sub-assembly from being damaged.

        Tech Tips


        • Measure the transmitter battery voltage while pressing the LOCK or UNLOCK switch on the electrical key transmitter sub-assembly.

        • Perform the measurement with the transmitter battery at room temperature.

        • The electrical key transmitter sub-assembly sends voltage information to the certification ECU (smart key ECU assembly) when it is transmitting. When this voltage is 2.1 V or less the Data List item "Key Low Battery" displays "Yes" Click here.

        A01EWLW
        Standard Voltage
        Tester Connection Condition Specified Condition
        Transmitter battery positive (+) - Transmitter battery negative (-) Engine switch off, all doors closed and LOCK or UNLOCK switch pressed 2.2 to 3.2 V

    NG

    REPLACE TRANSMITTER BATTERY Click here

    OK

    REPLACE ELECTRICAL KEY TRANSMITTER SUB-ASSEMBLY

  8. CHECK WAVE ENVIRONMENT


    1. Bring the electrical key transmitter sub-assembly near the door control receiver and perform a wireless door lock control function operation check.

      Tech Tips


      • When the electrical key transmitter sub-assembly is brought near the door control receiver, the possibility of electric wave interference decreases, and it can be determined if electric wave interference is causing the problem symptom.

      • 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 electric 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.

      OK
      Wireless functions operate normally.

    NG

    CHECK POWER SOURCE Click here

    OK

    AFFECTED BY WAVE INTERFERENCE

  9. CHECK POWER SOURCE


    1. When the engine switch is off, check that functions other than the wireless door lock control function recognize the power source mode as being off.

      Tech Tips


      • Check if systems that should not be operating when the power source mode is off are operating.

      • When the certification ECU (smart key ECU assembly) mistakenly determines the power source mode to be on (IG) for some reason (example: an ECU mistakenly determines the power source mode to be on (IG) and sends that information to the certification ECU (smart key ECU assembly)) even though the power source mode is off, the certification ECU (smart key ECU assembly) disables the wireless door lock control function.

      OK
      When the power source mode is off, functions other than the wireless door lock control function recognize the power source mode as being off.

    NG

    GO TO PUSH-BUTTON START SYSTEM Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - BATTERY AND BODY GROUND)


    1. A01EYRPE48
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Certification ECU (smart key ECU assembly))

      Disconnect the A43 certification ECU (smart key ECU assembly) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A43-10 (CUTB) - Body ground IG OFF 11 to 14 V
      A43-2 (+B) - Body ground IG OFF 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-11 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O45 door control receiver 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
      O45-4 (+5) - O1-5 (RCO) Always Below 1 Ω
      O45-5 (DATA) - O1-15 (RDAM) Always Below 1 Ω
      O45-2 (CSEL) - O1-6 (CSEL) Always Below 1 Ω
      O45-1 (GND) - Body ground Always Below 1 Ω
      O45-4 (+5) or O1-5 (RCO) - Body ground Always 10 kΩ or higher
      O45-5 (DATA) or O1-15 (RDAM) - Body ground Always 10 kΩ or higher
      O45-2 (CSEL) or O1-6 (CSEL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK DOOR CONTROL RECEIVER (OPERATION)


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

    2. Check that the wireless functions operate normally.

      OK
      Wireless functions operate normally.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (DOOR CONTROL RECEIVER WAS DEFECTIVE)