* Wiring: Check all wiring harnesses, connectors, and fuses related to the headlight system. Look for broken wires, corrosion, or loose connections. This is the most common culprit. Pay particular attention to the area where the wiring passes through the body.
* Headlight switches: The headlight switch itself could be faulty. Test its continuity.
* Relay: The headlight system may use a relay. A faulty relay would prevent power from reaching the motors.
* Grounds: Poor grounding can prevent the headlights from functioning. Check all ground connections associated with the headlight system.
* Body Control Module (BCM): While you mentioned the actuator module is okay, the BCM could be sending an incorrect signal or experiencing a fault. This is less likely if the motors and actuator module work independently.
* Bulbs: It might sound obvious, but check the bulbs themselves. They could simply be burned out.
Troubleshooting Steps:
1. Visual Inspection: Carefully examine all wiring, connectors, and bulbs for any visible damage.
2. Fuse Check: Check the fuses in the fuse box related to the headlights.
3. Multimeter Test: Use a multimeter to test voltage at various points in the headlight circuit to identify where the power is interrupted.
4. Relay Test (if applicable): If you identify a relay, swap it with a known good relay from another circuit (if possible) to rule it out.
5. Ground Check: Clean and tighten all ground connections associated with the headlight system.
If you're not comfortable working with car electrical systems, it's best to take your Corvette to a qualified mechanic. Diagnosing electrical issues can be tricky, and improper repairs could cause further damage.
