The Turn Signal Flasher of the Toyota Sienna helps to keep the minivan's indicators blinking in a consistent pattern to alert nearby drivers of your plan to turn or merge. Located in the fuse block, this small relay gets current when the lever is moved on the steering column, then interrupts that current in a timed way to turn the lamps off and on quickly. The early models of the Sienna utilized a thermal design Turn Signal Flasher that heated a strip of spring steel. The strip would bend to close the circuit and then cool down to repeat the process. The sequential process of heating and cooling created both the click sound and the flash that many Sienna drivers would be familiar with. In later years, an electronic or solid state Turn Signal Flasher relying on a transistorized timing chip to create the same rhythm without heat was adopted. This design pairs nicely with modern LED bulbs and multiple-lamp circuits. Every Turn Signal Flasher, whether thermal or solid state, is calibrated for the electrical load of the specific Toyota wiring. When the proper Turn Signal Flasher unit is installed, hyper flashing or total lamp failure is prevented. The result is that every Toyota Sienna signals clearly.
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