2003 GMC Sonoma Owner's Manual - Page 394

At Least Four Times a Year Tailgate Lubrication Service Lubricate taiigate iatch bolt, handle assembly pivot points, and hinges with lubricant recommended in Part D. Starter Switch Check At Least Once a Year Key Lock Cylinders Service Lubricate the key lock cylinders with the lubricant specified in Part D. e When you are doing this check, the u __.__. could move suddenly. If it does, you or others could be injured. Follow the steps below. 1. Before you start, be sure you have enough room around the vehicle. 2. Firmly apply both the parking brake and the regular brake. See Parking Brake on page 2-37 if necessary. Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts. 3. On automatic transmission vehicles, try to start the engine in each gear. The starter should work only in PARK (P) or NEUTRAL (N). If the starter works in any other position, your vehicle needs service. On manual transmission vehicles, put the shift lever in NEUTRAL (N), push the clutch down halfway and try to start the engine. The starter should work only when the clutch is pushed down all the way to the floor. If the starter works when the clutch isn't pushed all the way down, your vehicle needs service. 6-27 Body Lubrication Service Lubricate all body door and fuel door hinges, latches and locks, including the glove box and console doors, the body hood, secondary latch, pivots, spring anchor, release pawl 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.