GMC 1997 Safari Owner's Manual page 368

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. If your vehicle has
a
built-in child
restraint, also periodically make sure the harness straps,
latch plates, buckle, clip, retractors and anchorages are
working properly. Look for any other loose or damaged
safety belt and built-in child restraint system parts. If
you see anything that might keep a safety belt or built-in
child restraint system from doing its job, have it
repaired. Have any torn or frayed safety belts or harness
straps 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.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace blade
inserts that appear worn or damaged or that streak or
miss areas of the windshield. Also see "Wiper Blades,
Cleaning" in the Index.
Automatic Transmission Check
Check the transmission fluid level; add if needed. See
"Automatic Transmission" in the Index. A fluid loss
may indicate a problem. Check the system and repair
if needed.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in
P a r t D.
Body Lubrication Service
Lubricate all body door hinges, the body hood, fuel
door and rear compartment hinges, latches and locks
including interior glove box and console doors, and any
moving seat hardware. Lubricate the hood safety lever
pivot and prop rod pivot.
P a r t
D tells you what to use.
More frequent lubrication may be required when
exposed to a corrosive environment.