Here's a general overview. Specific steps may vary slightly depending on the exact model and trim of your Cutlass Ciera. Always consult a repair manual specific to your vehicle's year and model for precise instructions and diagrams. A Haynes or Chilton manual is a good investment for this type of work.
Steps (General):
1. Disconnect the negative battery cable: This is the most important step to prevent electrical shock and damage.
2. Remove the steering wheel: This usually involves removing the steering wheel retaining nut (often requiring a special socket), then pulling the wheel off the steering column. Be aware of the steering wheel's position before removal so you can reinstall it correctly. You might need a steering wheel puller tool.
3. Access the ignition switch: This will require removing parts of the steering column shroud or trim panels. The exact method varies greatly depending on your specific model. You might need to remove screws, clips, or other fasteners to access the ignition switch.
4. Disconnect the wiring harness: Carefully disconnect the electrical connectors from the ignition switch. Take photos or make a detailed diagram before disconnecting anything to ensure correct reassembly. Note the location and color of each wire.
5. Remove the ignition switch: The ignition switch itself is usually held in place with screws or a retaining clip. Remove these fasteners to release the switch.
6. Install the new ignition switch: Carefully align the new ignition switch and install it in the reverse order of removal. Make sure it's properly seated and all fasteners are tightened securely.
7. Reconnect the wiring harness: Reconnect the electrical connectors to the new ignition switch, making sure each wire is in the correct location. Refer to your photos or diagram.
8. Reinstall the steering wheel: Carefully align the steering wheel and tighten the retaining nut to the correct torque specification (check your repair manual).
9. Reinstall the steering column shroud and trim panels: Put everything back together in the reverse order of removal.
10. Reconnect the negative battery cable: After everything is reassembled, reconnect the negative battery cable.
11. Test the ignition system: Test the new ignition switch by starting the car and checking all the ignition functions (lights, accessories, etc.).
Important Considerations:
* Repair Manual: A repair manual specific to your 1990 Oldsmobile Cutlass Ciera is absolutely essential. Generic instructions like these are a starting point but don't cover all the nuances of your specific vehicle.
* Special Tools: You might need special tools such as a steering wheel puller, Torx sockets, and possibly other specialized tools depending on your car's configuration.
* Safety: Always disconnect the battery's negative terminal before working on the ignition system. Take precautions to avoid short circuits.
* Professional Help: If you're not comfortable working on your car's electrical system, it's best to take it to a qualified mechanic. Improper installation can lead to electrical problems or even damage to your car.
This is a complex task, and this is a simplified overview. Please prioritize safety and consult a repair manual before attempting this repair.
