I would do all what was said above.

But also check:

- Alarm system works.
- Leather and Cloth seats damage or imperfections.
- Lever for seating, automatic adjustable seats, and heat seats work.
- Make sure radio works: Sirius, CD, DVD, Navigation, and other things.
- Lighting works: Turn signals, headlights, fogs.
- Mats or custom mats are included.
- Mirrors adjust, bend-inwards, and heat (if you got that option).
- Illuminated Cupholders actually work.
- Instrument Cluster: Temperature and Compass Gauge, Vehicle Information Center, Steering Wheel Mounted Audio Controls, Tire Pressure Monitoring Display, and Steering Wheel Mounted Audio Controls work.
- UConnect Hands-Free Communication and Universal Garage Door Opener work.
- Power Sunroof works.
- High-Intensity Discharge Headlamps work.
- Engine Block Heater works.
- Compact Spare Tire is actually there.
- Windshield wipers work.
- And exterior body and paint is perfect: Check for paint imperfections, R/T Hood to Fender Stripes, emblems, and spoiler is ok.