5v relay is the key to car driving

Activating the 5v relay is the most important and most overlooked part of a car's ignition system. Its role is to redirect power from the battery to the starter solenoid valve, which then turns the starter on and the engine idles. Only when the relay is working properly can you switch the vehicle on and off normally.
Although you may not have encountered the problem of the relay at present, it is a part that is related to whether your car can drive. Once it is worn out, for your driving safety, please contact a professional maintenance personnel to replace it in time.

It's worth noting that most modern cars are equipped with electronic ignition switches that are activated by a remote control. The electronic chip of the remote control key is connected with the kinetic energy on the car, allowing you to achieve the effect of remote start. But sometimes this key fob can affect the 5v relay and convey the wrong error message.
This is common when battery current is low, but is also a sign that the starter relay is not sending a full signal. The relay does not exist in a state of good and bad. Once it cannot send a signal, it means that the starting relay is damaged.