* Access: Getting to the ignition switch often requires removing the steering column shroud, steering wheel, and possibly other components. The amount of disassembly varies by year.
* Wiring: The ignition switch has multiple wires connected to it, and misconnecting them can cause significant damage to the vehicle's electrical system. You'll need to carefully label everything before disconnecting.
* Security: Newer models might have additional security features integrated with the ignition switch that require special tools or procedures.
* Steering Wheel Lock: Disconnecting the ignition switch can sometimes interfere with the steering wheel lock mechanism, potentially requiring special handling.
General Steps (This is NOT a complete guide, and may not apply to all years):
1. Disconnect the battery: This is crucial to prevent electrical shorts and injury.
2. Remove the steering column shroud: This usually involves removing screws and possibly some trim pieces.
3. Remove the steering wheel (if necessary): This requires special tools and knowledge to avoid damaging the airbag. If you are not comfortable with this step, it's best to leave it to a professional.
4. Disconnect the ignition switch wiring harness: Carefully label each wire before disconnecting. Take pictures as well, if possible.
5. Remove the ignition switch: This often involves removing screws or other fasteners securing the switch to the steering column.
6. Install the new ignition switch: Carefully align the new switch and secure it with the appropriate fasteners.
7. Reconnect the wiring harness: Make sure to match the wires to your labels or pictures.
8. Reinstall the steering wheel (if removed): Again, this is a delicate process requiring special tools and knowledge.
9. Reinstall the steering column shroud.
10. Reconnect the battery.
11. Test the ignition system: Make sure the ignition works correctly in all positions, including starting the car.
Why you should consider a professional:
Incorrect installation can lead to:
* Damaged wiring: Causing electrical problems throughout the vehicle.
* Steering wheel lock issues: Leaving the steering wheel locked and inoperable.
* Immobilizer problems: Preventing the vehicle from starting.
* Airbag deployment: Improper steering wheel removal can cause accidental airbag deployment.
In short: This is a complex repair. Unless you have significant automotive experience, including experience with steering column disassembly and electrical systems, it's strongly recommended that you take your Buick Century to a qualified mechanic. The cost of professional repair will likely be less than the cost of potential damage caused by an incorrect installation.
