K 2500 Truck 4WD V8-6.5L DSL Turbo VIN F (1994)
Quad Driver: Description and Operation
Quad/Output Driver Module
The Control Module in this vehicle controls most components with electronic switches which complete a ground circuit when turned on.
When the switches are arranged in groups of 4, they can independently control up to 4 outputs and are called Quad Drivers.
When the switches are arranged in groups of 7, they can independently control up to 7 outputs and are called Output Drivers.
Not all outputs are always used.