Lexus RX350 Ignition Lock Assembly allows the driver to start the engine, unlock the steering column, and power components using a keyed unit or, on later editions, a push button detected by a coded fob. Early Lexus RX350 models had a column-mounted Ignition Lock Assembly which required you to insert a metal key, then turn it to ACC, ON, or START to route battery power, and also lock the wheel when it was set to OFF. To curb theft, Lexus took the step to add chip-coded keys so that the Ignition Lock Assembly would only allow cranking when the vehicle computer recognized the signal. Recent versions of the Lexus RX350 use keyless start instead of the mechanical Ignition Lock Assembly, using an electronic switch that sends the same start, run, and component signals when it detects the fob is present, reducing wear that previously caused jammed tumblers. Across all RX350 years, the Ignition Lock Assembly maintains the starter, fuel, and component circuits in reliable driver command.
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