2016 Bus Wiring Diagnosis Basics Testing

One of the best way to beat the cost of owning a vehicle from 2008-2014 models is to understand understand the basics of bus wiring diagnosis. This requires knowledge of bus modules or nodes that is used all the time when troubleshooting electrical problems. Lets start with the very common basic diagrams shown here.

1).Close and open circuits

1.) Shown above on the left is a close wiring circuit. As you can see, there are 4 components:

* Battery which is the power supply

* Fuse and switch which are the power control mechanism.

* Lamp which is your load

* Power conductor or a means where power can flow.

A close circuit refers to the flow of current which is a continuous path from the positive side of the battery to the negative side. From this diagram, you can expand the circuit into what is going on with your vehicle. The power supply is combined with the alternator to provide power. Power controls will now include circuit breakers, relays, solenoids, rheostats. The loads can grow to all kinds of lights for the lamp and would power also the motors (not the engine but like your wiper motor or power windows), instruments, solenoids and radios. The power conductors include all the wires, terminals, cab chassis and component housings.

2). On your right is the open circuit as shown by the red arrow pointing to a broken wire.

When you have an open circuit, the path or flow to the ground is broken or disconnected. Common cause is the switch is on OFF position but it could be caused by a blown fuse, an open filament in the light bulb or a broken wire to the ground connection.

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