Understand the Existing System
The first step in the process is to understand the existing system on a vehicle that is equipped with “Park Assists”. Just for background information, the term “Park Assist” was chosen for a reason. GM will tell you very quickly, this is NOT a safety device. This is for parking ONLY. Their fear is some bonehead will back over someone and claim the backup sensors never warned them. Not being considered a safety device made our lives much easier. That was good news since we had such a terrible time anyway. I could write a book about EMC testing!
Now, just so happens, Momma has a company car (2008 Tahoe) that is getting close to the end of its lease. Also, just so happens, Momma is out of town on a business trip in China. While the cat is a away the mice will play!
Back to step 1, in this step we’re going to activate the system and see how it works. Part of activating the system is putting the vehicle into reverse gear with the engine off. So, block the wheels so the vehicle won’t roll away while out of park gear. The system can be activated by keying up the ignition (again, leave the engine off) and pulling the gear shifter into reverse. With the vehicle stationary, you can get out of the vehicle and play with the system. There are three LED lights that light up based on range. There is also a chime when a new object is detected. Or, a continuous chime for very close objects. With the back hatch open the chime is easier to hear. Now is the time you can check the range of the system to verify to makes it out to 2.5 meters. We spent many months working on the FOV (field of view) for GM.I could never understand why GM wanted such a long range – they are the only ones shooting out to 2.5 meters. Everyone else is happy at 2 meters. Would a customer actualy care about that extra 1/2 meter? I know, I rant too much.