1996 GMC Sonoma Owner's Manual - Page 340

At Least Twice a Year Restraint System Check Make sure the safety belt reminder light and all your belts, buckles, latch plates, retractors and anchorages are working properly. Look for any other loose or damaged safety belt system parts. If you see anything that might keep a safety belt system from doing its job, have it repaired. Have any torn or frayed safety belts replaced. Also look for any opened or broken air bag covers, and have them repaired or replaced. (The air bag system does not need regular maintenance.) At Least Four Times a Year Tailgate Lubrication Service Lubricate tailgate latch bolt, handle assembly pivot points, and hinges with lubricant recommended in Part D. Lubricate every 3,000 miles ( 5 000 kmj if following schedule I or every 7,500 miles ( I 2 500 km) if following schedule 11. At Least Once a Year Key Lock Cylinders Service Lubricate the key lock cylinders with the lubricant specified in Part D. Automatic Transmission Check Check the transmission tluid level; add if needed. See "Automatic Transmission" in the Index. A tluid loss may indicate a problem. Check the system and repair if needed. Body Lubrication Service Lubricate all body door and fuel door hinges, latches and locks including the glove box, console doors and the body hood, and any moving seat hardware. Lubricate the hood safety lever pivot and prop rod pivot. Part D tells you what to use. More frequent lubrication may be required when exposed to a corrosive environment. 7-48