Question 1

Testing of an alarm system is being discussed. Technician A says that if the system fails to operate with the relay by-passed. The relay is defective. Technician B says the relay is generally tested with an ammeter. Who is correct?

Accepted Answer

Technician A is incorrect because if the system fails to operate with the relay bypassed, it indicates a problem elsewhere, not necessarily a defective relay. Technician B is incorrect because relays are typically tested with a multimeter or by checking continuity, not specifically with an ammeter.

Question 2

When testing the rear window defogger, the test light remains bright as it is moved the length of each grid. The most likely cause is a poor ground circuit connection.

Accepted Answer

A poor ground circuit connection can prevent the current from flowing through the grid, resulting in a constant bright test light when testing the rear window defogger.

Question 3

The amount of current flow through the rear window defogger grid depends on the temperature of the grid.

Accepted Answer

The amount of current flow through the rear window defogger grid does depend on the temperature of the grid. The higher the temperature, the more current will flow through the grid to heat it up and defog the window.

Question 4

The power door lock system does not operate. Technician A says faulty unlock relay contacts could be the cause. Technician B says a faulty motor could cause this. Who is correct?

Accepted Answer

Faulty unlock relay contacts could cause the power door lock system to fail, as the relay controls the lock/unlock function. A faulty motor would only affect the lock and/or unlock function of one specific door, whereas this question is specifically asking about the entire power door lock system. Therefore, Technician A is correct and Technician B is not relevant to the issue described.

Question 5

A window regulator converts the rotary motion of the motor into the vertical movement of the window.

Accepted Answer

The window regulator is a mechanical device that transforms the rotary motion generated by the motor into the vertical movement needed to move the window up and down.

Question 6

The drive side power seat does move fore or aft. The technician notices that the motor attempts to move the seat then stops. The least likely cause of this is:

Accepted Answer

A faulty PTC is the least likely cause because it would prevent the motor from attempting to move the seat at all.

Question 7

When diagnosing a memory seat system, you find that the driver's seat does not move at all. The first procedure you should perform is

Accepted Answer

Before checking anything electrical, a visual inspection should be performed to see if there are any obvious issues such as disconnected wiring or damaged components. Once a visual inspection has been done, further diagnostic procedures can be determined based on the results of the inspection.

Question 8

The antitheft system alarm periodically goes off without any apparent reason. Technician A says the problem could be caused by a faulty door ajar switch. Technician B says worn contacts inside the starter interrupt relay could be causing the problem. Who is correct?

Accepted Answer

A faulty door ajar switch can cause the antitheft system alarm to go off without any apparent reason. Worn contacts inside the starter interrupt relay would not cause the alarm to go off.

Question 9

The cruise control system is inoperative. Technician A says a faulty brake light switch can be the cause. Technician B says the cause may be the dump valve is stuck open. Who is correct?

Accepted Answer

Both Technician A and Technician B are correct. A faulty brake light switch can indeed cause the cruise control system to be inoperative because the system is designed to disengage when the brakes are applied. If the switch is faulty, it might signal that the brakes are being applied even when they are not, preventing the cruise control from engaging. Similarly, if the dump valve, which is part of the cruise control's vacuum system in some vehicles, is stuck open, it could prevent the system from maintaining the set speed, thereby causing the cruise control to be inoperative.

Question 10

A resistor block wired in parallel controls the speed of most motor fans.

Accepted Answer

A resistor block wired in parallel would not control the speed of most motor fans; typically, speed control in such applications is achieved through varying the voltage or current, often using series connections or electronic speed controllers, not parallel connections.

Question 11

The set vehicle speed for cruise control can be a function of the electronic throttle control (ETC) system.

Accepted Answer

The electronic throttle control system is responsible for adjusting the throttle to maintain the set speed of the vehicle during cruise control. Therefore, the set vehicle speed for cruise control can be a function of the ETC system.

Question 12

Technician A says aftermarket grill assemblies may inhibit the operation of the adaptive cruise control system. Technician B says a horn that sounds continuously can be caused by a short to ground in the between the relay and the horn. Who is correct?

Accepted Answer

The answer of Technician A says aftermarket grill assemblies may...

Question 13

Interval or intermittent wipers use a variable resistor to directly control current flow to the motor.

Accepted Answer

Interval or intermittent wipers typically use a relay or electronic control module to control the timing of the wiper operation, not a variable resistor to directly control current flow to the motor.

Question 14

Technician A says the electronic cruise control system may use a normally open vent valve. Technician B says the electronic cruise control system may utilize the electronic throttle control system. Who is correct?

Accepted Answer

Technician A is correct that the electronic cruise control system may use a normally open vent valve to regulate the vacuum signal. 
Technician B is also correct that the electronic cruise control system may utilize the electronic throttle control system to modulate the engine's throttle position.

Question 15

The horn button on a relay-equipped horn system will apply a ground to the relay coil to activate the horn(s).

Accepted Answer

The horn button typically provides a ground signal to activate the horn relay, which then provides power to the horn(s).

Question 16

The adaptive cruise control system is not operating. Technician A says the ACC sensor may have debris on the lens. Technician B says electronic throttle control actuator is faulty. Who is correct?

Accepted Answer

Technician A is correct. Debris on the lens of the ACC sensor can obstruct the sensor's ability to detect other vehicles and cause the system to malfunction. Technician B is incorrect because a faulty electronic throttle control actuator is not related to the operation of the adaptive cruise control system.

Question 17

A vent valve that is stuck open may cause the cruise control system to be inoperative.

Accepted Answer

A stuck open vent valve can cause a vacuum leak, which can affect the operation of the cruise control system that relies on vacuum pressure for its activation.

Question 18

The memory seat function will operate only when the transmission is in the park position.

Accepted Answer

This is a safety feature designed to prevent the driver from mistakenly adjusting the seat while the car is in motion.

Question 19

The wipers operate properly in the manual mode, but not in the automatic mode. Technician A says the problem may be caused by a fault in the bus network. Technician B says the problem may be caused by a faulty rain sensor module. Who is correct?

Accepted Answer

Both technicians are correct. A fault in the bus network can disrupt communication between the vehicle's systems, affecting the automatic mode of the wipers. A faulty rain sensor module can also directly impact the functionality of the wipers in automatic mode, as it is responsible for detecting rain and activating the wipers accordingly.

Question 20

False wipes in an automatic wiper system are usually the result of a foreign material on the windshield or from flaws in the windshield that interfere with the system optics.

Accepted Answer

False wipes in an automatic wiper system can indeed be caused by foreign materials on the windshield or flaws in the windshield that interfere with the system's optics, as these systems often use optical sensors to detect moisture.

Quiz 13: Accessorieselectrical Accessories Diagnosis and Repair