Headlights on a timer
 

2000 Lexus ES 300 grandsons car. The issue is with the headlights. When turned on, it's like they're on a 30 second timer and they shut off. Low beams only. All other lights work fine. I know there is a timer when the car is shut off. After 30 seconds, the lights go off but that's "all" lights (running lights, markers) not just low beams. I swapped the headlight relay just to be sure but no change. I've been thinking about the daylight sensor in the dash too but I'm not fluent in auto electrical systems now that computers run everything. I would welcome your thoughts.