For 1990-2009 cars

Listed below are the vehicle inspections and services that should be performed by either the owner or a qualified technician at the intervals indicated to help ensure the following:

• | The safety of the vehicle.

• | The vehicle emission system performance.

• | The dependability of the vehicle.

Complete any necessary repairs at once. Use the proper fluids or lubricants whenever adding to the vehicle. For information on fluids and lubricants to use when service is required, refer to Fluid and Lubricant Recommendations .

### At Least Monthly

#### Tire Inflation Check

Measure the tire pressure when the tires are COLD. Maintain the tire pressures indicated on the Tire Placard on the driver's door of the vehicle, or refer to Tire Inflation Pressure Specifications .

#### Cassette Deck Service

Clean the cassette deck. A cleaning should be performed after every 50 hours of playing time to prevent permanent damage, or after every 30 hours for maximum performance.

### At Least Twice A Year

#### Restraint System Check

Make sure the safety belt reminder light and all the belts, buckles, latch plates, retractors, anchorages are working properly. Look for any other loose or damaged safety belt system parts. If anything is seen that might keep a seat belt system from doing it's job, have it repaired. Have any torn or frayed seat belts replaced. For seat belt diagnosis information, Refer Operational and Functional Checks in Seatbelts.

Also look for any opened or broken supplemental inflatable restraint (SIR) covers. For SIR diagnosis information, Refer to SIR Diagnostic System Check in SIR.

The SIR system does not need regular maintenance.

#### Automatic Transmission Check

Check the automatic transmission fluid level. Add the proper transmission fluid if needed. A fluid loss may indicate a problem. Check the system and repair if needed. For information on the correct fluid to use, refer to Fluid and Lubricant Recommendations .

For the automatic transmission fluid level checking procedure, Refer to Transmission Fluid Check in Automatic Transmission.

#### Weatherstrip Lubrication

Clean the weatherstrip surface, and then apply a thin film of silicone grease, GM P/N 12345579 or equivalent, using a clean, dry cloth.

#### 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. Refer to Wiper Blade Element Replacement Wiper Blade Assembly Replacement in Windshield Wiper/Washer System.

### At Least Once A Year

#### Key Lock Cylinders

Lubricate the key lock cylinders with the proper lubricant. For information on the proper lubricant to use, refer to Fluid and Lubricant Recommendations .

#### Body Lubrication

Lubricate all body door hinges and latches, including the following:

• | The hood

• | The rear compartment lid

• | The fuel door

• | The headlamp pivot points

• | The console door

• | The I/P passenger compartment

For information on the proper lubricants to use, refer to Fluid and Lubricant Recommendations .

More frequent lubrication may be required when exposed to a corrosive environment.

#### Starter Switch Check

Caution: When performing this check, the vehicle could move suddenly. Personal injury or property damage may result. Make sure there is enough room around the vehicle, in case the vehicle does move. Do not use the accelerator pedal, and be ready to turn OFF the engine immediately if it starts.

On an automatic transmission vehicle, try to start the engine in each gear. The starter should crank only in PARK or NEUTRAL. If the starter operates in any other position, the vehicle needs service.

On a manual transmission vehicle, place the shift lever in NEUTRAL, push the clutch pedal down halfway and try to start the engine. The starter should operate only when the clutch pedal is fully depressed all the way to the floor. If the starter operates when the clutch pedal is not pushed all the way down to the floor, the vehicle needs service.

#### Brake Transmission Shift Interlock (BTSI) Check

Caution: When performing this check, the vehicle could move suddenly. Personal injury or property damage may result. Make sure there is enough room around the vehicle, in case the vehicle does move. Be ready to apply the regular brake immediately should the vehicle begin to move.

With the engine OFF, turn the ignition to RUN, but do not start the engine. Without applying the regular brakes, try to move the transmission shift lever out of PARK with normal effort. If the shift lever moves out of PARK, the brake transmission shift interlock (BTSI) needs service. For wiring schematic information, Refer to Shift Lock Control Schematics in Steering Wheel and Column.

#### Steering Column Park Lock Check

While parked and with the parking brake set, try to turn the ignition key to LOCK in each shift lever position.

On an automatic transmission vehicle, the key should turn to LOCK only when the shift lever is in PARK.

On a manual transmission vehicle, the key should turn to LOCK only when the shift lever is in REVERSE.

On all vehicles, the key should come out only in the LOCK position. For wiring schematic information, refer to Ignition and Key Alarm Switch Assembly - Disassemble - Off Vehicle in Steering Wheel and Column.

#### Parking Brake and Automatic Transmission PARK Mechanism Check

Caution: When performing this check, the vehicle could begin to move. Personal injury or property damage may result. Make sure there is enough room in front of the vehicle, in case the vehicle begins to roll. Be ready to apply the regular brake immediately should the vehicle begin to move.

To check the holding ability of the parking brake: Place the vehicle on an incline and apply the parking brake. With the engine running and transmission in NEUTRAL, slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake only.

To check the holding ability of the automatic transmission PARK mechanism: Place the vehicle on an incline. With the engine running, shift the transmission to PARK, then release all brakes. For diagnosis information of a malfunctioning PARK mechanism, refer No Park Range in Automatic Transmission.

#### Underbody Flushing

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