1. Blown fuse: Check the fuse labeled "CIGAR" or "ACC" in your vehicle's fuse box. If the fuse is blown, replace it with a new fuse of the same amperage rating.
2. Faulty lighter socket: The cigarette lighter socket itself could be faulty. Try plugging in a different device, such as a phone charger, to see if it works. If the other device doesn't work, the socket may need to be replaced.
3. Loose wiring: Check the wiring connections to the cigarette lighter socket. Make sure the connections are tight and free of corrosion.
4. Faulty ignition switch: The ignition switch may not be properly supplying power to the cigarette lighter. Try turning the ignition key to the "ACC" position and see if the lighter works. If it does, the ignition switch may need to be replaced.
5. Faulty relay: There may be a relay that controls the power supply to the cigarette lighter. Check the owner's manual or a repair manual for the location of the relay and test it to see if it is working.
If none of these solutions work, you may need to take your vehicle to a qualified mechanic for further diagnosis and repair.
