Adding to my response above, judging from Google Street View, they'll pick you up on the lower level (all pick-ups are lower level) towards the end of the loop (across from P4 parking in Street View). If you follow the road on Google Street View and look behind you, you can see the Motel 6 shuttle pull out behind the camera. As of December 2017, the shuttles still look the same, with the same Motel 6 logo on the front and sides.
By the way, traffic at the airport is a big pain, and the shuttles move fast out of necessity. My shuttle to my rental car company was flying past stops. If you book here, you may want to call or email with your itinerary, so they know to wait a little longer for you.
There are somewhat limited hours though. I can't remember off-hand, but I think they start at 6:00 AM and go until 9:00 PM.
Motel 6 Los Angeles LAX 관계자 및 이전 숙박고객에게서 답변을 구하세요.