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Home >> Lexus >> 2022 >> RX 450hL >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Headlight Beam Level Control System (Diagnostics - Introduction)) >> Automatic Headlight Beam Level Control System >> Fail-Safe Chart [10/2015 - 08/2019] >> Fail-Safe Chart [10/2015 - 08/2019]
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Fail-Safe Chart [10/2015 - 08/2019]

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2019 Lexus RX 450hL, 2019 Lexus RX 450h, 2018 Lexus RX 450hL, 2018 Lexus RX 450h, and 2017 Lexus RX 450h. However, it is still accessible from the selected car via links, so may be relevant.
  1. FAIL-SAFE FUNCTION 
    1. Headlight ECU sub-assembly
      1. The headlight ECU sub-assembly stops light operation if 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 Output
        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
        AFS (adaptive front-lighting system)* Displayed Output
        Power supply IG voltage line malfunction Displayed Output
        Other than an IG voltage line malfunction Not displayed Not output
        1. *: w/ AFS (Adaptive Front-lighting System)
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