1. Disconnect the Battery: This is the most crucial step. Disconnect the negative (-) terminal first, then the positive (+) terminal. Wait at least 30 minutes to allow the airbag system to fully discharge. This minimizes the chance of accidental deployment.
2. Remove the Steering Wheel (If Necessary): Many repairs requiring access to the wiper switch stalk require steering wheel removal. This is where the airbag risk is highest. If you need to remove the steering wheel:
* Consult a repair manual: A factory service manual for your specific year and model DeVille is essential. It will have detailed instructions and diagrams, including torque specifications for reassembly.
* Locate the airbag connections: The airbag will have connectors; carefully disconnect them. Many manuals recommend disconnecting the battery's negative terminal *again* before doing this. Some have a specific procedure for this, including disconnecting a yellow connector. *Follow your manual precisely.* Never use tools to pry on the airbag connectors.
* Remove the steering wheel carefully: Use the correct tools and follow the manual's instructions meticulously. Avoid dropping or jarring the wheel.
3. Access the Wiper Switch: Once the steering wheel is removed (if needed), locate the wiper switch stalk. This usually involves removing the steering column shroud or other trim pieces. Your repair manual will show you exactly how to do this.
4. Disconnect the Wiper Switch Connections: Carefully disconnect the electrical connectors from the old wiper switch. Take photos or make notes of the connections' positions before disconnecting to ensure correct reassembly.
5. Install the New Wiper Switch: Carefully install the new wiper switch, ensuring that all connectors are securely reconnected.
6. Reassemble: Reverse the disassembly steps, carefully reinstalling all removed components. This includes reconnecting the airbag if removed (again, follow the manual precisely). Pay close attention to torque specifications for all bolts.
7. Reconnect the Battery: Reconnect the positive (+) terminal, then the negative (-) terminal.
Important Considerations:
* Repair Manual: A factory service manual is invaluable. It will provide detailed instructions and diagrams specific to your vehicle, dramatically reducing the risk of error and damage.
* Airbag Safety: If you're uncomfortable working with airbags, take your car to a qualified mechanic. The risk of injury from an accidentally deployed airbag is significant.
* Tools: Gather the necessary tools *before* starting the repair. This will prevent frustration and potential damage.
By carefully following these steps and consulting a repair manual, you can significantly reduce the risk of setting off the airbags while replacing the wiper switch. However, there's always a small inherent risk involved, and professional assistance is always an option.
