Without a repair manual, I can only offer a general outline, and this is not a complete guide:
1. Disconnect the battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first.
2. Remove the steering wheel: This is usually a multi-step process involving removing the steering wheel retaining bolt (often requiring a special tool) and disconnecting the airbag (if equipped – exercise extreme caution here and consult a manual to ensure the airbag is safely deactivated before proceeding). This is potentially dangerous if not done correctly.
3. Remove the instrument panel bezel: This usually involves carefully prying it away from the dash using plastic trim tools to avoid scratching. The bezel surrounds the instrument cluster and often requires removing screws or clips.
4. Access the wiper switch: Once the bezel is removed, you will likely need to remove other components to get to the wiper switch. This might involve removing the radio, climate controls, or other parts. The switch is usually mounted on the steering column, potentially behind the instrument panel.
5. Disconnect the electrical connectors: Carefully disconnect the electrical connectors from the wiper switch. Take pictures or make notes of their locations before disconnecting.
6. Remove the wiper switch: The switch is likely held in place by screws or clips. Carefully remove it, taking note of how it's mounted.
7. Install the new wiper switch: Reverse the removal process to install the new switch. Make sure all connectors are securely seated.
8. Reassemble everything: Put everything back together in the reverse order of disassembly. Pay attention to reattaching all panels and screws correctly.
9. Reconnect the battery: Connect the positive (+) terminal last.
10. Test the wipers: Check the operation of the wipers to ensure the new switch is working correctly.
Warnings and Considerations:
* Airbag Safety: If your DeVille has an airbag, disabling it improperly is extremely dangerous and can lead to serious injury or death. Consult a repair manual or professional.
* Electrical Connectors: Take careful note of the position and color of wiring connectors before disconnecting them. Incorrect reconnection can lead to malfunctions.
* Tools: You will need various tools, including screwdrivers (Phillips and possibly flathead), plastic trim tools, possibly a steering wheel puller, and potentially sockets and wrenches.
* Patience: This is a time-consuming job and requires patience and attention to detail.
This is a simplified outline, and variations exist depending on the specific model and trim level of your 1994 Cadillac DeVille. Again, I highly recommend obtaining and using a repair manual specific to your vehicle. Attempting this repair without proper knowledge and tools could lead to damage to your vehicle and potential injury. If you are uncomfortable performing this repair yourself, consider taking your car to a qualified mechanic.
