1998 Buick Riviera Owner's Manual - Page 198

Electronic Level Control This feature keeps therear of your vehiclelevel as the load changes.It's automatic -- you don't need to adjust anything. I you don'l $e the correct equi- lent and drive f properly, you can lose control when you pull a trailer. For example, if the trailer is too heavy, the brakes may not work well or even at all. You and your passengers could be seriously injured. You may also damage your vehicle; the resulting repairs would not be covered your warranty. by Pull a trailer only if you have followed the all steps in this section. your dealer for advice Ask and information about towing a trailer with your vehicle. -- 4-31