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Home >> Lexus >> 2018 >> RX 450h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Wireless Door Lock Control System (Diagnostic Codes & Symptom Tests) >> Wireless Door Lock Control System >> DTC B1242: Wireless Door Lock Tuner Circuit Malfunction [10/2015 - ] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • 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.
  • The wireless door lock control system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ]

  • Before replacing the electrical key and tire pressure monitoring system receiver assembly or certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [10/2015 - 08/2019] , or refer to REGISTRATION [08/2019 - 07/2021] , or refer to REGISTRATION [07/2021 - ]

  • 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 [10/2015 - 08/2019] , or refer to REGISTRATION [08/2019 - ]

  • It is necessary to perform initialization (Refer to INITIALIZATION [10/2015 - 08/2019] , or refer to INITIALIZATION [08/2019 - ] ) after registration (Refer to REGISTRATION [10/2015 - 08/2019] , or refer to REGISTRATION [08/2019 - ] ) of the transmitter IDs into the electrical key and tire pressure monitoring system receiver assembly if the electrical key and tire pressure monitoring system receiver assembly has been replaced.