Exam 13: Accessorieselectrical Accessories Diagnosis and Repair

Describe the operation of the adaptive cruise control system.

What feature is an additional function of many memory seat systems that moves the seat rearward when the key is removed from the ignition switch?

The power seat operates normally, but the memory recall function does not. What could be the cause?

The right front electric window is inoperative regardless of which switch is used. It sounds like the motor is turning. Technician A says the window regulator may be disengaged. Technician B says the sector gear may be worn. Who is correct?

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

How do depressed-park windshield wiper systems generally park the blades?

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?

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

Technician A says the motor turns faster if there are more armature windings connected between the common and high-speed brushes. Technician B says the less counterelectromotive force (CEMF) in the armature, the greater the armature current. Who is correct?

Technician A says the power seat system typically uses stepper motors. Technician B says the rotational direction of the power seat motor is determined by the direction current flows through it. Who is correct?

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

What comfort features do climate-controlled seats offer?

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?

Describe the function of the memory seat.

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

Testing of the blower motor system shown is being discussed. The power module terminals for both the control and motor ground circuits is backprobed. A voltmeter is connected between the control circuit terminal and chassis ground, and the second voltmeter is connected between the motor ground terminal and chassis ground. Technician A says when the motor is turned off, both voltmeters should read 12 volts. Technician B says as the blower motor switch is rotated from LOW speed to HIGH speed, the readings on the first voltmeter should drop. Who is correct?  

A blower motor that is rotating very slowly is being tested. A voltmeter placed across the power and ground terminals of the motor indicates 6 volts when the blower switch is placed in the "high" speed position. All of the following statements about the possible cause of this problem are true, EXCEPT  

A two-speed windshield wiper will operate in only the low-speed position. Technician A says the common motor brush is worn. Technician B says the Hi-Lo relay may be faulty. Who is correct?  

Technician A says the blower motor is usually a permanent magnet, single-speed motor. Technician B says the switch position directs current flow to one of the three different brushes in the blower motor. Who is correct?

The electric rear window defogger system is being discussed. Technician A says the grid is a series of controlled voltage amplifiers. Technician B says to protect the vehicle's electrical system, a timer circuit may be incorporated. Who is correct?