How do I use the Remote Vehicle Start feature?
Press and release the lock button (Q) on the RKE transmitter, then immediately press and hold the remote start button (/) until the turn signal lamps flash — or hold for at least four seconds if the vehicle's lights cannot be seen. When the vehicle starts, the park lamps will turn on and remain on while the engine is running, doors will lock, and the climate control system will operate automatically. The engine will automatically shut off after 15 minutes if the vehicle is not entered. (Page 18)
From the official Chevrolet Trailblazer manual, page 18
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