1997 GMC Sonoma Owner's Manual - Page 72

The front axleportion of the diagram on the indicator will light upwhen you shift into four-wheel drive. A slight delay between shifting and the pattern's lighting is normal. If the pattern does not light up, or if the front axlelights do not go outafter you shift outof four-wheel drive, have your dealer check your system. Turn the INT LIGHTS switch located to theright of your headlamp switch to dim your transfer case indicator light when your headlamps or parking lamps are on. This will also cause your instrument panel lights to dim. N SET PARK BRAKE: Shift to this neutral setting only when your vehicle needs to be towed. 4LO: This setting also engages your front axle to give you extra traction and provides extra gear reduction. You may never need 4LO. It sends the maximum power to all four wheels. You might choose 4LO if you were driving off-road in sand, mud, or deep snow and climbing ordescending steep hills. You can shift from 2HI to 4HI orfrom 4HI to 2HI while the vehicleis moving. Do not press the transfer case shift lever button when shifting from 2HI to 4HI or from 4HI to 2HI. 2HI: This setting is for driving in most street and highway situations. Your front axleis not engaged in two-wheel drive. 4HI: This setting engages your front axle to help drive your vehicle. Use 4HI when you need extra traction, such as on snowy or icy roads, or in most off-road situations. To shift your transfer case intoN SET PARK BRAKE: 1. Stop the vehicle and shift your transmission into NEUTRAL (N). 2. Set the parking brake. Your vehicle can roll unless the brakes are applied. 3. Pull the transfer case shift lever into N SET PARK BRAKE. 2-24