The interior light control module on a 2001 GMC 3500 van isn't a separate, easily identifiable module like a computer. The control is integrated into the body control module (BCM). The BCM is usually located under the dashboard, often near the steering column, but the exact location can vary slightly depending on the van's configuration. You'll likely need to consult a wiring diagram or a repair manual specific to your van's year and model to locate it precisely.
Important Note: Accessing and working on the BCM requires technical expertise. Improper handling can damage the module or other vehicle systems. If you're experiencing problems with your interior lights, it's generally best to consult a qualified automotive electrician or mechanic. Attempting repairs yourself without the proper knowledge and tools could lead to further complications.
