Ignition module location on 1990 Buick Century?

The ignition module on a 1990 Buick Century is not a separate component like in older vehicles. Instead, the ignition control module is integrated into the Powertrain Control Module (PCM). The PCM is usually located under the dashboard, often near the center console or under the carpet on the passenger side. However, the exact location can vary slightly depending on the specific trim level and options.

You're unlikely to find a separate box labeled "ignition module". Any work related to the ignition system will require dealing with the PCM, which is a much more complex and sensitive component. If you suspect a problem with the ignition system, it's best to take it to a qualified mechanic for diagnosis. Attempting to work on the PCM yourself without the proper knowledge and tools can cause significant damage.