Where to locate Beijing Hilton Airport hotel shuttle bus?

I will arrive at 18:05 into PEK. Once I go through immigration and retrieve my luggage, etc., where do I go to find the shuttle bus to the Hilton airport hotel? The Hilton website says "Level 1, Gate 5", but I don't see a Level 1 on any of the maps. Is this on the same level as baggage claim? How will I know where to go? Thank you!