Exam 8: Automotive Multiplexing and Networking of Computers

Technician A says on  pulse width modulated (PWM) busses, all bits are the same length. Technician B says on variable pulse width (VPW) designs,  one pulse may be long and the next pulse may be short. Who is correct?

A standardized binary code (or computer language) is known as a:

Which acronym applies to serial data in which the "ones" and "zeros" are defined not only by the voltage value but also by the bit length (a "one" can be a short high-voltage pulse or a long low-voltage pulse and a "zero" can be a short low-voltage pulse or a long high-voltage pulse)?

Which function is likely to be controlled by a body control module (BCM)?

It has been shown that emergency response vehicles can be disabled through the installation of a computer virus through with method?

Why should a DSO be used in diagnosing a vehicle's multiplexing bus?

Which acronym applies to the portion of the binary message that allows the receiving module to detect message errors through a mathematical calculation?

Newer configurations tend to wire the nodes to the data bus in a parallel fashion, known as a _____ topology.

The bus-H and bus-L circuits of a dual wire (DW) bus used on a Ford are being viewed on a dual-channel oscilloscope. Technician A says the waveforms should be identical. Technician B says the waveforms should mirror each other. Who is correct?

J1850 messaging is being discussed. Which portion of the message immediately follows the start-of-frame signal?

What does the term baud rate mean?

Why are the two wires of a twisted-pair multiplex system twisted?

Which protocol was first used on the 1991 Mercedes S-Class to provide an intra-vehicle communication network between the nodes on a bus?

How do manufacturers reduce the effects of an induced voltage in a single-wire (SW) multiplexed circuit?

Fiber optic protocols are being discussed. Technician A says BMW uses five data buses on the E65 model. Technician B says one of the fiber optic data buses used by BMW is known as MOST. Who is correct?

During vehicle diagnosis, you discover that the scan tool will not communicate with the network. All of these checks should be made EXCEPT :

Which characteristic(s) describe advantages of multiplexed circuits over hard-wired circuits?

In a J1850 protocol, the process of determining which node can continue to transmit data on the bus when two or more nodes begin transmitting at the same time is known as:

The computer that is the dominant node on the bus and controls the data bus is known as the _____.

Which quality is attributed to multiple body computers?