Check the following steps:
1. Battery
* Check the battery terminals for corrosion or looseness.
* Use a voltage tester to check the battery; it should read about 12.6 volts.
* If the battery is weak or damaged, charge or replace it.
2. Fuses and relays
* Locate the vehicle’s fuse and relay box.
* Inspect the fuses inside the unit for blown or damaged fuses.
* Use a fuse tester to check them.
* Replace any faulty fuses.
3. Weight
* Check the vehicle’s grounding points for rust or looseness.
* Clean and tighten grounding points.
4. Main switch
* Some cars have a main switch, usually located in the passenger compartment or trunk.
* Make sure the main switch is turned on.
5. Wiring harness
* Inspect the vehicle’s wiring harness for damage or kinks.
*Check if any wires are damaged.
* If damage is found, repair or replace the wires.
6. Electrical module
*If all of the above does not reveal any problems, the electrical module may be faulty.
*Consult a qualified mechanic for further diagnosis.
Additional tips:
*Use a flashlight to illuminate the work area.
* Be careful when working with battery acid.
* Disconnect the negative battery terminal before doing any wiring work.
*If you are unsure of your electrical installation skills, consult a qualified mechanic.