GM Service Manual Online
For 1990-2009 cars only

The following information covers the tests, inspections, and services required to maintain the safety, dependability, and emission control performance of the vehicle.

Ensure that any necessary repairs are completed on time. Whenever any fluids and/or lubricants are added to the vehicle, ensure to use the proper fluids and/or lubricants. Refer to Fluid and Lubricant Recommendations .

At Each Fuel Fill

Perform the following underhood inspections at each fuel fill.

Engine Oil Level

Inspect the engine oil level and add the proper oil when necessary. Refer to Fluid and Lubricant Recommendations .

Engine Coolant Level

Inspect the engine coolant level and add the proper coolant mixture when necessary. Refer to Fluid and Lubricant Recommendations .

Windshield Washer Fluid Level

Inspect the windshield washer fluid level in the windshield washer reservoir and add the proper fluid when necessary. Refer to Fluid and Lubricant Recommendations .

At Least Once a Month

Tire Inflation Check

Inspect the tire inflation. Ensure the tires are inflated to the pressures specified on the Certification/Tire label located on the driver's door lock pillar. Refer to Tire Placard .

At Least Twice A Year

Restraint System Check

Ensure the safety belt reminder light and all of 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 am 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 coverings, and have them repaired or replaced. The SIR system does not need regular maintenance.

Wiper Blade Check

Inspect wiper blades for wear or cracking. Replace the blade inserts that appear worn or damaged or that streak or miss areas of the windshield.

Weatherstrip Lubrication

Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone grease with a clean cloth. During very cold, damp weather more frequent application may be required.

Manual Transmission Check

Check the transmission fluid level; add if needed. Check for leaks. A fluid leak is the only reason for fluid loss. Have the system inspected and repaired if needed.

Automatic Transmission Check

Inspect the automatic transmission fluid level; add if needed. A fluid loss may indicate a problem. Inspect the system and repair as needed.

Hydraulic Clutch System Check

Check the fluid level in the clutch reservoir. Inspect the system and repair as needed.

At Least Once a Year

Key Lock Cylinders Service

Lubricate the lock cylinders with the recommended lubricant. Refer to Fluid and Lubricant Recommendations for the proper type of lubricant.

Body Lubrication Service

Lubricate all of the following areas:

    • Body door hinges
    • Body hood, safety lever, and prop rod pivot
    • Fuel door
    • Rear compartment hinges
    • Rear compartment latches and locks
    • Instrument panel compartment hinges, latch, and lock cylinder
    • Console cover hinges and latch
    • Seat hardware

More frequent lubrication may be required when exposed to a corrosive environment. Refer to Fluid and Lubricant Recommendations for the proper type of lubricant.

Starter Switch Check

  1. Before you start, ensure you have enough room around the vehicle.
  2. Important: Do not use the accelerator pedal, and be ready to turn off the engine immediately if it starts.

  3. Firmly apply both the park brake and the regular brake.
  4. 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.
  5. Refer to Diagnostic Starting Point - Automatic Transmission Shift Lock Control in Shift Lock Control.

Automatic Transmission Shift Lock Control Check

  1. Before you start, ensure you have enough room around the vehicle. It should be parked on a level surface.
  2. Important: Be ready to apply the regular brake immediately if the vehicle begins to move.

  3. Firmly apply the parking brake.
  4. With the engine off, turn the key to the RUN position, but do not start the engine.
  5. Without applying the regular brake, try to move the shift lever out of PARK (P) with normal effort.
  6. If the shift lever moves out of PARK (P), the automatic transmission shift lock control needs service.
  7. Refer to Diagnostic Starting Point - Automatic Transmission Shift Lock Control in Shift Lock Control.

Ignition Transmission Lock Check

  1. With the vehicle parked, set the parking brake.
  2. Insert the ignition key into the ignition lock cylinder and turn the ignition lock cylinder to OFF.
  3. Move the transmission shifter to REVERSE.
  4. Try to turn the ignition lock cylinder to LOCK.
  5. Repeat Steps 3 and 4 with the transmission shifter in every possible position. If the ignition lock cylinder turns to LOCK when the transmission shifter is in ANY position other than PARK, repair the park lock system.
  6. Refer to Diagnostic Starting Point - Automatic Transmission Shift Lock Control in Shift Lock Control.

  7. Turn the ignition lock cylinder to OFF.
  8. Try to remove the key from the ignition lock cylinder.
  9. Repeat Steps 6 and 7 with the ignition lock cylinder in every possible position. If the key comes out of the ignition lock cylinder in ANY position other than LOCK, repair the system.

Park Brake and Automatic Transmission Park (P) Mechanism Check

  1. Ensure that the vehicle is parked on a fairly steep hill with the vehicle facing downhill.
  2. Keep the regular brake firmly engaged while setting the park brake.
  3. Perform the following procedure in order to test the holding ability of the park brake:
  4. • Ensure that the engine is running.
    • Ensure that the transmission is in the NEUTRAL (N) position.
    • Slowly remove foot pressure from the regular brake pedal.
    • Do this until the vehicle is held by the park brake only.
  5. If the parking brake fails to hold the vehicle, repair the system.
  6. Perform the following procedure in order to test the holding ability of the PARK (P) mechanism's holding ability:
  7. 5.1. Ensure that the engine is running.
    5.2. Shift to PARK (P).
    5.3. Release all of the brakes.

If the park mechanism fails to hold the vehicle, repair the system.

Underbody Flushing Service

At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean thoroughly any areas where mud and other debris can collect.