* Fuses: Consult your owner's manual for the location of the headlight fuse(s) and check them for continuity.
* Headlight Switch: The switch itself could be faulty.
* Wiring: Look for broken or corroded wires in the headlight circuit, particularly near the headlights themselves and the switch.
Instead of a relay, the Aspire's simplified system means troubleshooting involves checking the fuses and switch directly, and then tracing the wiring if those components are fine.