Here's a general overview of the process, but remember, variations may exist depending on your specific model and trim level:
1. Preparation:
* Safety First: Disconnect the negative battery cable to prevent electrical shorts.
* Gather Tools: You'll likely need a variety of tools including screwdrivers (Phillips and possibly flathead), socket wrenches, pliers, and possibly a retaining ring tool. A shop manual will provide the specific tools needed.
* Obtain Replacement Part: Get the correct ignition switch assembly for your 2003 Pontiac Grand Am. Using the wrong part will lead to failure. The part number can usually be found in your owner's manual or online using your VIN.
2. Accessing the Ignition Switch:
* Steering Column Removal (Possibly): This is the most significant challenge. You'll likely need to access the ignition switch through the steering column. This often involves removing the steering wheel (a very delicate operation requiring special tools and knowledge to avoid damaging the airbag), and possibly removing the steering column shroud and other components. Incorrectly removing the steering wheel can trigger the airbag, resulting in serious injury.
* Column Shroud Removal: The column shroud is usually held in place by screws and clips. Carefully remove them to expose the ignition switch.
3. Removing the Old Ignition Switch:
* Disconnect Electrical Connectors: Carefully disconnect all electrical connectors attached to the ignition switch. Take photos or make notes of how they connect to avoid errors during reassembly.
* Remove the Switch: This often involves removing screws, bolts, and possibly a retaining clip holding the switch in place. The exact method will depend on your specific vehicle's design.
* Note Orientation: Pay close attention to how the old switch is oriented.
4. Installing the New Ignition Switch:
* Install New Switch: Carefully install the new ignition switch, ensuring it's correctly oriented.
* Reconnect Electrical Connectors: Reconnect all the electrical connectors you previously disconnected, referring to your notes or photos.
* Reassemble Components: Carefully reassemble the steering column shroud, and if removed, the steering wheel.
5. Testing:
* Reconnect Battery: Reconnect the negative battery cable.
* Test Ignition: Test the ignition switch to ensure it functions correctly. Check all positions (accessory, ignition, start).
Important Considerations:
* Airbag Safety: If you need to remove the steering wheel to access the ignition switch, understand the risks associated with airbag deployment. If you're unsure, seek professional help.
* Professional Help: If you're not comfortable with this type of repair, it's highly recommended you take your vehicle to a qualified mechanic. Incorrectly installing the ignition switch can lead to significant problems, including damage to your vehicle's electrical system.
* Repair Manual: Investing in a repair manual specific to your 2003 Pontiac Grand Am is crucial. It will provide detailed instructions and diagrams.
This is a simplified overview. The actual procedure may be significantly more involved. Do not attempt this repair without consulting a professional repair manual and assessing your own mechanical skills. Improper repair can lead to serious injury or damage to your vehicle.
