The headlight actuator relays for a 1996 Corvette are not individual, easily identifiable relays like you might find in other vehicles. Instead, the headlight motor control is handled by the
Body Control Module (BCM). The BCM itself is located
inside the car, typically under the dashboard, often near the left side (driver's side).
There isn't a separate relay to replace; problems with headlight operation usually point to issues within the BCM itself, wiring to the BCM, the headlight actuators themselves, or a problem with the switches or related circuitry.