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Home >> Lexus >> 2022 >> IS 350 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 46 (Automatic Headlight Beam Level Control System - Diagnostics - Introduction) >> Automatic Headlight Beam Level Control System >> Fail-Safe Chart [10/2016 - 09/2020] >> Fail-Safe Chart [10/2016 - 09/2020]
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Fail-Safe Chart [10/2016 - 09/2020]

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2020 Lexus IS 350, 2020 Lexus IS 300, 2019 Lexus IS 350, 2019 Lexus IS 300, and 2018 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
  1. FAIL-SAFE FUNCTION 
    1. No. 1 Headlight ECU sub-assembly
      1. The No. 1 headlight ECU sub-assembly stops light operation if any of the following malfunctions are detected.
        Malfunction Multi-information Display Warning DTC Output
        Lighting on/off LED light source malfunction Low beam Displayed Output
        High beam Not Displayed Not output
        Headlight fan malfunction Displayed Output
        Other than above (communication with main body ECU (multiplex network body ECU)) Displayed Output
        Automatic headlight beam level control system Displayed Output
        Power supply IG voltage line malfunction Displayed Output
        Other than an IG voltage line malfunction Not displayed Not output
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