Determine if your car is on the List of Admissible Vehicles from the United States, which is available from Transport Canada. Verify that your vehicle is still admissible by calling Transport Canada.
Notify the U.S. Customs office at the border crossing that you'll be exporting a vehicle at least 72 hours before you leave. A Customs officer will stamp the vehicle's salvage title when you leave the United States.
Drive to the Canadian side of the border, and give your stamped title and registration to a Customs officer. Customs will give you either Vehicle Import Form 1 (for licensing) or Form 3 (for parts) to fill out. Pay the import fee (Canadian Customs only accepts credit cards).
Wait until you receive a Vehicle Inspection Form in the mail, usually a week or two after import. This form tells you what you'll need to do to bring your salvage vehicle into compliance with Canadian law. Make the required modifications, and save your receipts for verification.
Take the car, receipts and Form 1 to an authorized inspection center or a Canadian Tire store (Canadian Tire is the only retail chain authorized to perform inspections). A list of inspection centers is available from the Registrar of Imported Vehicles. For a salvage vehicle, you have one year after import to get it inspected. The inspector will stamp your form; take this form to your provincial licensing office to get the vehicle licensed.