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Some 2015 Toyota Sienna models have a built-in remote start feature, but this typically requires an additional package purchase at the time of buying. However, if you are purchasing a used vehicle without this feature, you may easily install it yourself. For instance, the StartX kit, which costs around $220, comes with a plug-and-play harness system. Another popular option is the Viper 7756V aftermarket kit. Whether you opt for the aftermarket kit or have the factory installation, you can activate the remote start by pressing the lock button on your key fob three times - the first two presses should be quick, and on the third press, hold the button until the Sienna starts up.
A feature called Remote Engine Starter can be added to the 2015 Toyota Sienna at an extra charge.