1. Identify the System:
* Simple System (Most Likely): Your Astro likely uses a dimmer switch that only controls the intensity of the headlights, and the headlights only come on manually. In this case, there's nothing to disable; the lights are *not* automatically turning on. Double-check your headlight switch—is there a position that appears to activate "auto"? If not, you likely don't have an automatic system.
* More Advanced System (Less Likely): Some higher trim levels *might* have had an optional automatic headlight system (often tied to a dusk sensor). This would be more involved to disable.
2. If You Have an Automatic Headlight System:
If you *do* have an automatic system, disabling it will likely involve one of these methods (Proceed with caution; incorrect modifications can be dangerous):
* Locate the Dusk Sensor: This sensor detects ambient light levels. It's usually a small, photo-sensitive component located somewhere near the rearview mirror or in the dashboard. Disconnecting the sensor's wiring harness might disable the automatic function. However, this isn't always guaranteed, as the system may have other failsafes.
* Fuse Removal: Find your vehicle's fuse box (usually under the hood or dashboard). Check your owner's manual for the fuse labeled "Headlights" or something similar. Removing this fuse will disable the entire headlight system, including manual operation. This is not recommended as it's a safety hazard.
* Relay Disconnection: Similar to the fuse, a relay might control the automatic headlight circuit. Disconnecting this relay (again, check your owner's manual) might disable the automatic function. However, this also requires specific knowledge of your Astro's electrical system.
* Professional Help: The safest and often easiest approach is taking your Astro to a qualified auto electrician or mechanic. They can accurately identify the system, diagnose the issue, and safely modify it to remove the automatic headlight function.
Before attempting any of these solutions, consult your owner's manual. It may provide information on your specific lighting system and how it operates. Improperly messing with your vehicle's electrical system can cause damage or create safety hazards. If you're not comfortable working with car electronics, professional help is strongly advised.
