ENTRY AND START SYSTEM (for Entry Function) Driver Side Door Entry Unlock Function does not Operate

DESCRIPTION

If the driver door entry lock function operates normally, but its entry unlock function does not, this means that the request code from the driver door is being output normally. In this case, a malfunction in the touch sensor circuit (from the certification ECU (smart key ECU assembly) to the front door outside handle assembly (touch sensor)) is suspected.

WIRING DIAGRAM

A00425DE56

INSPECTION PROCEDURE

Note


  • The entry and start system (for entry function) uses a LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the entry and start system (for entry function) after confirming that the communication system is functioning properly.

  • Confirm that another key is not in the cabin.

PROCEDURE


  1. CHECK POWER DOOR LOCK OPERATION


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

      OK
      Door locks operate normally.

    NG

    GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Problem Symptoms Table) Click here

    OK

  2. READ VALUE USING GTS (DOOR LOCK POSITION SWITCH)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Data List.

    5. Read the Data List according to the display on the GTS.

      Main Body
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      FR Door Lock Pos*1 Front right side lock position switch signal/LOCK or UNLOCK

      LOCK: Front right side door locked

      UNLOCK: Front right side door unlocked

      		 -
      FL Door Lock Pos*2 Front left side door lock position switch signal/LOCK or UNLOCK

      LOCK: Front left side door locked

      UNLOCK: Front left side door unlocked

      		 -

      • *1: for RHD

      • *2: for LHD

      OK
      On the GTS screen, the display changes between LOCK and UNLOCK as shown in the chart above.

    NG

    GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) Click here

    OK

  3. READ VALUE USING GTS (DOOR OUTSIDE HANDLE)


    1. Enter the following menus: Body Electrical / Entry & Start / Data List.

    2. Read the Data List according to the display on the GTS.

      Entry & Start
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D-Door Touch Sensor Status of touch sensor (for driver side) / ON or OFF

      ON: Touch sensor touched

      OFF: Touch sensor not touched

      		 -
      OK
      On the GTS screen, the display changes between ON and OFF as shown in the table above.

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE) Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - FRONT DOOR OUTSIDE HANDLE)


    1. Disconnect the L56 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the z3*1 or z4*2 front door outside handle assembly (for driver side) connector.

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


      • *1: for LHD

      • *2: for RHD

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      L56-20 (SEN1) - z3-4 (SENS) Always Below 1 Ω
      L56-20 (SEN1) - Body ground Always 10 kΩ or higher
      z3-4 (SENS) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      L56-20 (SEN1) - z4-4 (SENS) Always Below 1 Ω
      L56-20 (SEN1) - Body ground Always 10 kΩ or higher
      z4-4 (SENS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (TOUCH SENSOR SIGNAL INPUT)


    1. Reconnect the L56 certification ECU (smart key ECU assembly) connector.

    2. Reconnect the z3*1 or z4*2 front door outside handle assembly (for driver side) connector.


      • *1: for LHD

      • *2: for RHD

      A00431IE05
      Text in Illustration
      *A for LHD *B for RHD
      *a

      Component with harness connected

      (Certification ECU (Smart Key ECU Assembly))

      		 - -

    3. Measure the voltage and check for pulses according to the value(s) in the table below.

      Standard
      Tester Connection Condition Specified Condition
      L56-20 (SEN1) - L56-15 (E)

      • Power switch off

      • All doors closed

      • Key not in detection area

      • Touch sensor (for driver side) not touched

      		 Pulse generation
      L56-20 (SEN1) - L56-15 (E)

      • Power switch off

      • All doors closed

      • Key not in detection area

      • Touch sensor (for driver side) touched

      		 Below 2 V

    NG

    REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (for Driver Side) Click here

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)