Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: How To Troubleshoot Ecu Controlled Systems

Introduction

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General Information

GENERAL INFORMATION A large number of ECU controlled systems are used in this vehicle. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical kn ...

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Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Lighting System (w/ Automatic Headlight Beam Level Control System): Variation Code not Written (B2451)
DESCRIPTION The No. 1 headlight ECU sub-assembly LH stores this DTC if the vehicle specifications have not been stored. DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from B2451 Variation Code not Written The engine switch is on (IG). Vehicle speci ...

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Theft Deterrent System: Security Horn Circuit
DESCRIPTION When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Bef ...