1995 GMC Sonoma Owner's Manual - Page 68

While you accelerate, it is normal for the light to go on and off if you quickly change the position of the accelerator. Ignore the SHIFT lightwhen you downshift. Four- Wheel Drive Vehicles Only: If your vehicle has four-wheel drive and is equipped with a manual transmission, disregard the shift light when the transfer case is in 4LO. Locking Rear Axle If you have thisfeature, your rear axle can give you additional traction on snow, mud, ice, sand or gravel.It works like a standard axle most of the time, but when one of the rear wheels has no traction and the other does,the locking featurewill allow the wheel with traction to move the vehicle. Parking Brake To Release the Parking Brake: Hold the regular brake pedal down. Pull the brake release lever. It is located on the bottom driver's side of the instrument panel. 2-22