When analyzing circuit diagrams, especially those with electronic control units, it is often necessary to determine the role of a certain circuit. However, the function of some circuits is not clearly marked on the circuit diagram. At this time, the elimination method can be used to determine the function of the unknown function circuit.
For example, there are three circuits on a sensor, and it is known that two circuits are used for power supply and grounding, so the remaining circuit must be a signal circuit.
In a circuit diagram, there must be some circuits with complex partial circuits that are temporarily difficult to understand. At this time, you can abandon this part of the circuit and start with the simple and easy-to-understand circuit.
After the circuits in other places are understood, combine the circuits that have been understood to focus on analyzing the remaining circuits that are difficult to understand. This not only shortens the reading time, but also improves the reading accuracy.
From the perspective of the whole vehicle circuit, except the power supply circuit is shared among the various system circuits of the vehicle, the other system circuits are independent of each other, but there is also some internal connection between them.