Hi, I'm new here and am trying to find out if anyone has had a similar experience. Last night I think someone tried to steal my Yukon XL. I went out to run an errand and as I was approaching my rig, I noticed a dude standing next to the car next to me...elbows on the roof, facing my rig and holding a cell phone. It looked like maybe he was texting someone. I didn't think anything of it and got in my rig and after starting it noticed that the driver memory activated and everything started moving into place for the driver 2 settings, and the radio was on and tuned into a station I never listen to. I thought this was odd as I had shut off the memory feature long ago. I repositioned my seat and mirror, and proceeded to back out and noticed a car had pulled into the parking lot, had pulled a u turn and beeped his horn. The dude next to the car walked over and got into this vehicle and I pulled around them and continued on my way. After pulling into a gas station about a block away, I noticed something on my windshield and got out and retrieved the item. It was a Walmart Trac Phone, powered up, with a screen lock, and had been laying on my wiper blade, face down so that the ear piece was facing the windshield. I noticed that it was positioned almost directly over the sensor in the middle of the dash. I think that dude was using the phone to try and transmit a code of some sort to open the door locks, and who knows what else. My Yukon has OnStar, however I do not currently subscribe to the service. I have had the Yukon for about 2 months now, I bought it used and didn't get an owners manual with it. This is my first time owning a GM product for many years and am actually still getting to know it. I can honestly say I absolutely LOVE this rig...it's my favorite of all the vehicles I have ever owned, with exception of a 1970 Plymouth Cuda I owned many years ago. Anyway, this kinda has me a little freaked out. I don't want someone jacking my rig. Has anyone else had any similar experiences out there? I'm not really sure what all I can do to ensure the safety of it...but for tonight, I have removed the 3 big relays under the hood as they all seem to interchange with the starter relay. Anyone have any other ideas? Any input would be greatly appreciated. Thanks.