Question 1

A bidirectional scan tool fails to make an actuator operate; which of the following could be the cause:
A) Faulty scan tool .
B) Open actuator ground circuit .
C) Open power circuit to the actuator .
D) All of these choices .

Accepted Answer

Any of the given options could be the cause of the issue, so all of them are possible reasons.

Question 2

All of the following statements about computer memory are true, EXCEPT:
A)RAM stores temporary information that can be written to and read by the CPU.
B)ROM can only be read by the CPU.
C)All PROM memory is flashable.
D)Volatile memory is erased when voltage is removed.

Accepted Answer

PROM (Programmable Read-Only Memory) cannot be changed or reprogrammed once it is programmed. Only EPROM (Erasable Programmable Read-Only Memory) and EEPROM (Electrically Erasable Programmable Read-Only Memory) are flashable.

Question 3

The relay coil circuit is controlled by a low-side driver. Direct battery feed is connected to the other terminal of the coil. If the BCM monitors voltage on the control circuit to determine proper operation, which of the following statements is not true?
A) The voltage reading by the BCM before the low-side driver should be battery voltage with the coil turned off.
B) The voltage reading by the BCM before the low-side driver should be close to 0 volts with the coil turned on.
C) A constant low voltage reading by the BCM may be the result of an open in the circuit between the battery and the coil.
D) The BCM will not be capable of setting control circuit faults.

Accepted Answer

This statement is not true as the BCM is capable of setting control circuit faults if it monitors voltage on the control circuit.

Question 4

Which of the following would represent the number "255" in binary code?
A)00000000
B)11111111
C)00001111
D)11110000

Accepted Answer

255 in binary code is represented as 11111111. Each digit in binary code represents a power of 2, starting from 2^0 (equal to 1). Therefore, the eight digits of 1 in choice B represents 2^7 + 2^6 + 2^5 + 2^4 + 2^3 + 2^2 + 2^1 + 2^0, which equals 255.

Question 5

All of the following statements about servicing the BCM are true EXCEPT:
A)Always check voltage supply circuits before replacing the BCM.
B)Analog voltmeters must be used to test circuit voltage.
C) Always check grounds before replacing the BCM.
D) Turn the ignitions switch to the OFF position before disconnecting or connecting components.

Accepted Answer

Analog voltmeters are not recommended for testing circuit voltage. Digital multimeters should be used instead as they provide more accurate readings.

Question 6

When flashing a computer, all of the following are true EXCEPT:
A)A battery charger should be connected to the vehicle's battery.
B) Special instructions may be displayed on the scan tool screen during the flash.
C) The flash process loads new software programming into the computer.
D) The BCM must be removed from the vehicle before it is flashed.

Accepted Answer

The BCM (Body Control Module) does not typically need to be removed for the flashing process, so option D is not true. Options A, B, and C are all true statements.

Question 7

Which of the following is responsible for sequential sampling?
A)DEMUX
B)Driver
C)MUX
D) Register

Accepted Answer

MUX is responsible for sequential sampling.

Question 8

Which of the following is correct?
A)Analog signals are either high-low, on-off, or yes-no.
B)Digital signals are infinitely variable within a defined range.
C)All of these choices.
D)None of these choices.

Accepted Answer

Both statements A and B are incorrect. Analog signals can have an infinite number of values within a defined range, while digital signals are discrete and have a finite number of possible values. Therefore, neither statement A nor B is correct.

Question 9

All of the following are precautions to prevent static electricity damage when replacing a control module EXCEPT:
A) Ground the package to a known good ground before opening .
B) Open the package only when ready to install the component .
C) Wipe the terminals clean before installing the component .
D) Touch a known good ground before opening the package .

Accepted Answer

Wiping the terminals clean before installing the component is not a precaution for preventing static electricity damage. The other options (grounding the package before opening, opening only when ready to install, and touching a known good ground before opening) are all recommended precautions for preventing static electricity damage.

Question 10

Which of the following is an actuator?
A) A motor.
B) A relay.
C) A solenoid.
D) All of these choices.

Accepted Answer

All of these options are considered to be actuators. An actuator is a type of device that is responsible for converting energy into motion. Both a motor and a solenoid utilize electrical energy to create motion, while a relay utilizes electrical energy to switch other devices on and off.

Question 11

The flashing of a computer is done to perform which task?
A) Repair hardware problems within the computer controlled system .
B) To update the software within the computer to correct or enhance operation .
C) Determine if the driver habits contribute to EEPROM issues .
D) Correct for faulty input signals .

Accepted Answer

Flashing a computer typically involves updating the software within the computer to correct or enhance operation. It is not typically done to repair hardware problems, determine driver habits, or correct faulty input signals.

Question 12

The scan tool indicates that an actuator is being turned on and off, however the actuator does not operate. What is the least likely cause?
A) Faulty computer .
B) Open in the control circuit of the actuator .
C) Open in the ground circuit of the actuator .
D) Defective actuator device .

Accepted Answer

The least likely cause is a faulty computer, as the scan tool indicates that the computer is sending signals to turn the actuator on and off, suggesting that the computer is functioning correctly.

Question 13

If the scan tool fails to make connection with the BCM, all of the following could be the cause except :
A) Loss of BCM power ground.
B) Open actuator circuit.
C) Open battery feed circuit to the BCM .
D) Faulty scan tool.

Accepted Answer

An open actuator circuit would not prevent the scan tool from connecting to the BCM, as it does not affect the communication or power supply to the BCM.

Question 14

Which method may be used to check a computer controlled actuator?
A) Use a labscope to monitor voltage levels .
B) Use an ammeter to monitor current flow .
C) Use a scan tool to activate the component .
D) All of these choices .

Accepted Answer

To properly check a computer controlled actuator, it is recommended to use multiple methods. Using a labscope to monitor voltage levels can help identify any fluctuations or irregularities in the signal going to the actuator. Using an ammeter to monitor current flow can help verify that the actuator is being supplied with the proper amount of power. Additionally, using a scan tool to activate the component can help confirm that the actuator is functioning properly and responding to commands from the vehicle's computer system. Therefore, all of these choices can be used to check a computer controlled actuator effectively.

Quiz 9: Introduction to the Body Computer Body Computer System Diagnosis

A bidirectional scan tool fails to make an actuator operate; which of the following could be the cause:

All of the following statements about computer memory are true, EXCEPT:

The relay coil circuit is controlled by a low-side driver. Direct battery feed is connected to the other terminal of the coil. If the BCM monitors voltage on the control circuit to determine proper operation, which of the following statements is not true?

Which of the following would represent the number "255" in binary code?

All of the following statements about servicing the BCM are true EXCEPT:

When flashing a computer, all of the following are true EXCEPT:

Which of the following is responsible for sequential sampling?

Which of the following is correct?

All of the following are precautions to prevent static electricity damage when replacing a control module EXCEPT:

Which of the following is an actuator?

The flashing of a computer is done to perform which task?

The scan tool indicates that an actuator is being turned on and off, however the actuator does not operate. What is the least likely cause?

If the scan tool fails to make connection with the BCM, all of the following could be the cause except :

Which method may be used to check a computer controlled actuator?