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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) >> DTC B1242: Wireless Door Lock Tuner Circuit Malfunction [06/2018 - ] >> Caution / Notice / Hint

Caution / Notice / Hint

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.
NOTE:
  • When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [06/2018 - 10/2019] , or refer to REGISTRATION [10/2019 - 09/2022] , or refer to REGISTRATION [09/2022 - ]

  • When replacing or inspecting the electrical key and tire pressure monitoring system receiver assembly and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the electrical key and tire pressure monitoring system receiver assembly, the performance of the entry function and wireless function may be affected.
  • This DTC is not stored within 10 seconds of the power switch being turned from on (IG) to off.
  • Make sure that there are no electrical key transmitter sub-assemblies in the vehicle.
  • When replacing the electrical key and tire pressure monitoring system receiver assembly, read the transmitter IDs (tire pressure warning system) stored in the old ECU using the Techstream and write them down before removal.

    Refer to REGISTRATION [06/2018 - 07/2019] , or refer to REGISTRATION [07/2019 - ]

  • If the electrical key and tire pressure monitoring system receiver assembly has been replaced, it is necessary to perform initialization (Refer to INITIALIZATION [06/2018 - ] ) after registration (Refer to REGISTRATION [06/2018 - 07/2019] , or refer to REGISTRATION [07/2019 - ] ) of the transmitter IDs to the electrical key and tire pressure monitoring system receiver assembly.
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