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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 250 (Wireless Door Lock Control System (Hybrid) - Diagnostic Codes & Symptom Tests) >> WIRELESS DOOR LOCK CONTROL SYSTEM (for HV Model) >> No Answer-Back [06/2018 - ] >> Procedure

No Answer-Back [06/2018 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus ES 300h, 2023 Lexus ES 300h, 2022 Lexus ES 300h, 2021 Lexus ES 300h, and 2020 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CUSTOMIZE SETTING USING TECHSTREAM (Hazard Answer Back, Wireless Buzzer Resp, Wireless Buzzer Vol) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Customize Setting / Wireless Door Lock.
    5. Select the setting by referring to the table below.

      Wireless Door Lock 

      Tester Display Description Default Setting ECU
      Hazard Answer Back Function that flashes the hazard warning lights once when the doors are locked by wireless operation and twice when the doors are unlocked by wireless operation ON 0:OFF, 1:ON Main body ECU (Multiplex network body ECU)
      Wireless Buzzer Resp Function that enables/disables the wireless door lock buzzer response ON 0:OFF, 1:ON Main body ECU (Multiplex network body ECU)
      Wireless Buzzer Vol Function that adjusts the wireless door lock buzzer volume Level5 0000:Level7, 0001:Level6, 0010:Level5, 0011:Level4, 0100:Level3, 0101:Level2, 0110:Level1, 0111:Level0 Main body ECU (Multiplex network body ECU)

      Result

      Result Proceed to
      All settings are ON and other than Level0 A
      A setting is OFF or Level0 B

    Result: 

    B 

    PERFORM CUSTOMIZE FUNCTION. Refer to  CUSTOMIZE PARAMETERS [06/2018 - 09/2022]  , or refer to  CUSTOMIZE PARAMETERS [09/2022 - ] 

    Result: 

    A 

    See step  2

  2. CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS 
    1. Check the wireless door lock control function using the electrical key transmitter sub-assembly.

      Refer to OPERATION CHECK [06/2018 - ]

      Result

      Result Proceed to
      Wireless door lock/unlock operates properly. A
      Wireless door lock/unlock does not operate properly. B

    Result: 

    B 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [06/2018 - ] 

    Result: 

    A 

    See step  3

  3. READ VALUE USING TECHSTREAM (FR Door Lock Pos, FL Door Lock Pos, RR-Door Lock Pos SW, RL-Door Lock Pos SW) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Main Body > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      FR Door Lock Pos Front door RH unlock detection switch signal LOCK or UNLOCK LOCK: Front door RH locked
      UNLOCK: Front door RH unlocked      		 -
      FL Door Lock Pos Front door LH unlock detection switch signal LOCK or UNLOCK LOCK: Front door LH locked
      UNLOCK: Front door LH unlocked      		 -
      RR-Door Lock Pos SW Rear door RH unlock detection switch signal OFF or ON OFF: Rear door RH locked
      ON: Rear door RH unlocked      		 -
      RL-Door Lock Pos SW Rear door LH unlock detection switch signal OFF or ON OFF: Rear door LH locked
      ON: Rear door LH unlocked      		 -

      Body Electrical > Main Body > Data List 

      Tester Display
      FR Door Lock Pos
      FL Door Lock Pos
      RR-Door Lock Pos SW
      RL-Door Lock Pos SW

      OK

      The Techstream display changes correctly in response to the lock/unlock operation.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit). Refer to  Door Unlock Detection Switch Circuit [06/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK WIRELESS ANSWER-BACK OPERATION 
    1. Check the wireless answer-back operation using the electrical key transmitter sub-assembly.

      Refer to OPERATION CHECK [06/2018 - ]

      Result

      Result Proceed to
      Only wireless door lock buzzer answer-back does not occur. A
      Only hazard warning light answer-back does not occur. B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  5

  5. PERFORM ACTIVE TEST USING TECHSTREAM (Wireless Buzzer) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Data List.
    5. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Wireless Buzzer Wireless door lock buzzer OFF/ON -

      Body Electrical > Main Body > Active Test 

      Tester Display
      Wireless Buzzer

      Result

      Result Proceed to
      Wireless door lock buzzer does not sound A
      Wireless door lock buzzer sounds B

    Result: 

    B 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    A 

    See step  6

  6. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    1. Disconnect the A19 wireless door lock buzzer connector.
    2. Perform the Active Test according to the display on the Techstream.

      Body Electrical > Main Body > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Wireless Buzzer Wireless door lock buzzer OFF/ON -

      Body Electrical > Main Body > Active Test 

      Tester Display
      Wireless Buzzer
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A19-1 (B) - A19-2 (E) Active Test Wireless Buzzer is OFF Below 1 V
      Active Test Wireless Buzzer is ON Pulse generation
      (frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)
      GTY826050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Wireless Door Lock Buzzer)

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE WIRELESS DOOR LOCK BUZZER. Refer to  REMOVAL [06/2018 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

    2. Reconnect the instrument panel junction block assembly connectors.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-1 (B) - MB-21 (BZR) Always Below 1 Ω
      A19-2 (E) - Body ground Always Below 1 Ω
      A19-1 (B) or MB-21 (BZR) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3F instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A19-1 (B) - 3F-29 Always Below 1 Ω
      A19-1 (B) or 3F-29 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. CHECK HAZARD WARNING LIGHTS OPERATION 
    1. Check that the hazard warning lights blink when the hazard warning signal switch is pressed.

      OK

      Hazard warning lights blink.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    NG 

    GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit). Refer to  Hazard Warning Switch Circuit [06/2018 - ] 

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