It's NOT consistently located in the same place across all Saturn 4-cylinder engines. Some were integrated into the distributor (in older models with distributors), while others are separate modules mounted on the engine or firewall.
To find it, you'll need to:
1. Consult your Saturn's repair manual: This is the most reliable source. The manual will have diagrams showing the location of all components, including the ICM.
2. Use an online repair database: Sites like Chilton, Alldata, or others (often requiring a subscription) have detailed diagrams and information specific to your year and model. You'll need to know the exact year, make, and model of your Saturn.
3. Search online forums: Search for forums specific to your Saturn model year. Someone may have already asked the same question and received a helpful answer with pictures.
Without knowing the specific year and model of your Saturn, it's impossible to give a precise location. Always be cautious when working on your car's electrical system.