Question 1

A data line has been diagnosed as being shorted to ground. Which of these would be the next step in diagnosing this problem?&#10;A)Replace the alternator&#10;B)Unplug modules one at a time and re-test the data line&#10;C)Disconnect the battery and then test the data line&#10;D)Replace the BCM

Accepted Answer

Unplugging modules one at a time and re-testing the data line is a systematic approach to isolate the issue. It helps identify if a specific module is causing the short to ground, without immediately resorting to replacing major components.

Question 2

A data bus is being checked for voltage activity. Both the DMM and the oscilloscope show a constant zero volts with the key on or off. This indicates ________.&#10;A)Normal activity&#10;B)A sleeping module&#10;C)The data line is shorted to ground&#10;D)None of these

Accepted Answer

The constant zero volts reading on both the DMM and the oscilloscope, regardless of the key position, suggests that the data line is shorted to ground. Normal activity or a sleeping module would not produce a constant zero volts reading.

Question 3

Low-speed networks operate at less than ________ bits per second.&#10;A)8,000&#10;B)10,000&#10;C)2,000&#10;D)5,000

Accepted Answer

Low-speed networks typically operate at less than 10,000 bits per second.

Question 4

UART uses a signal that toggles between 0 volts and ________.&#10;A)5 volts&#10;B)8 volts&#10;C)12 volts&#10;D)7 volts

Accepted Answer

UART typically uses a signal that toggles between 0 volts and 5 volts.

Deck 48: Electronic Fundamentals