1. Fuses: Check the fuses in your vehicle's fuse box to make sure that none are blown. A blown fuse can prevent power from reaching the interior lights and headlights.
2. Light Switch: Check the light switch to make sure that it is turned on. Sometimes, the light switch can become stuck or damaged, which can prevent the lights from turning on.
3. Headlight Relay: Check the headlight relay to make sure that it is functioning properly. A faulty headlight relay can prevent the headlights from turning on.
4. Wiring: There could be a problem with the wiring in your vehicle that is preventing power from reaching the interior lights and headlights. This could be due to a loose connection, a damaged wire, or a faulty ground.
If you are not comfortable checking these things yourself, I would recommend taking your vehicle to a qualified mechanic for diagnosis and repair.
