Possible reasons:
1. Dead battery:
*Check the battery terminals and make sure they are clean and tight.
* Charge or replace the battery.
2. Faulty generator:
* It does not charge the battery while the engine is running.
* Check the generator output voltage.
* Replace the generator if necessary.
3. Open circuit:
* Find and repair an open circuit.
* Check the fuses and relays associated with the vehicle’s electrical system.
4. Faulty ignition switch:
* It may not complete the circuit needed for electrical operation.
* Check the ignition switch and replace if necessary.
5. Problems with the ignition switch:
* There may be a malfunction that is preventing the ignition switch from supplying power to the electrical system.
* Try turning the key to different positions.
* Replace the ignition switch if necessary.
6. Damage to electrical wiring:
* There is a damage or short circuit in the electrical wiring.
* Visually inspect the wiring and look for damage.
* Replace damaged wiring sections.
7. Faulty Body Control Module (BCM):
* This is the computer that controls the vehicle’s electrical systems.
* If the BCM is faulty, electrical operation may be disabled.
* Have the BCM diagnosed and repaired by a qualified mechanic.
8. Other possible reasons:
* Faulty alarm or immobilizer.
* A blown fuse or relay responsible for the electrical system.
* Damage to connectors in the electrical system.