Check Safety Belt. Check that the safety belt is securely mounted, adjusts latches properly and is not ripped or frayed. Step 4: Turn Off Engine and Check Lights Make sure the parking brake is set, turnoff the engine, and take the key with you. Turn on headlights (low beams) and four-way emergency flashers, and get out of the vehicle. Step 5: Do Walk-around Inspection Go to front of vehicle and check that low beams are on and both of the four-way flashers are working. Push dimmer switch and check that high beams work. Turnoff headlights and four-way emergency flashers. Turn on parking, clearance, side-marker, and identification lights. Turn on right turn signal, and start walk-around inspection. General Walk around and inspect. Clean all lights, reflectors, and glass as you go along.