Week 5, Chapters 7 & 8 - Accessory Circuits & Driver Information

Question 1

Two technicians are discussing anti-theft systems. Technician A says that some systems require a special key. Technician B says that some systems use a computer chip in the key. Which technician is correct?

Answer 1

Both Technicians A and B

Question 2

A keyless remote control stops working. Technician A says the battery in the remote could be dead. Technician B says that the key fob may have to be resynchronized. Which Technician is correct?

Answer 2

Both Technicians A and B

Question 3

If only one power door lock is inoperative, a possible cause is what?

Answer 3

Defective door lock motor (Solenoid)

Question 4

PM Motors used in power windows, mirrors and seats can be reversed by what?

Answer 4

Reversing the polarity of the current

Question 5

When checking the operation of a rear window defogger with a voltmeter, the voltmeter should indicate ________ voltage when the grid is tested across the width of the glass.

Answer 5

Decreasing

Question 6

A typical 6-way power seat uses how many motors?

Answer 6

1-3 depending on the manufacturer

Question 7

Technician A says that a defected ground connection at the master control switch (driver side) could cause the failure of all power windows. Technician B says that if one control wire is disconnected, all windows will fail to operate. Which Technician is correct?

Answer 7

Technician A only

Question 8

All power windows fail to operate from the independent switches but all power windows operate from the master switch. Technician A says the window lock out switch maybe on. Technician B says the power window relay could be defective. Which Technician is correct?

Answer 8

Technician A only

Question 9

Technician A says that the cruise control on a vehicle that uses an electronic throttle control (ETC) system uses a servo to move the throttle. Technician B says that the cruise control on a vehicle with ETC uses the APP sensor to set the speed. Which Technician is correct?

Answer 9

Neither Technician A or B

Question 10

The owner of a vehicle equipped with cruise control complains that the cruise control often stops working when driving over rough or bumpy pavement. Technician A says the break switch may be out of adjustment. Technician B says a defective servo unit is most likely the cause. Which Technician is correct?

Answer 10

Technician A only

Question 11

The ________ controls vacuum to the servo.

Answer 11

Transducer

Question 12

Most power windows and power door locks use a ________ motor that has a built-in circuit breaker and is reversible.

Answer 12

Permanent-Magnet

Question 13

Some security keys use a computer chip or a ________.

Answer 13

Resistor

Question 14

Two Technicians are discussing a fuel gauge on a general motors vehicle. Technician A says that if the ground wire connection to the fuel tank sending unit becomes rusty or corroded, the fuel gauge will read lower than normal. Technician B says that if the power lead to the fuel tank sending unit is disconnected from the tank unit and grounded (Ignition on), the fuel gauge should go to empty. Which Technician is correct?

Answer 14

Technician B only

Question 15

If an oil pressure warning lamp on a general motors vehicle is on all the time, yet the engine oil pressure is normal, the problem could be what?

Answer 15

A defective (shorted) oil pressure sending unit

Question 16

When the oil pressure drops to between 3 and 7 PSI, the oil pressure lamps light by ________.

Answer 16

Grounding the circuit

Question 17

A brake warning lamp on the dash remains on whenever the ignition is on. If the wire to the pressure differential switch is unplugged the dash lamp goes out. Technician A says that this is an indication of a fault in the hydraulic break system. Technician B says that the problem is probably due to a stuck parking brake cable switch. Which Technician is correct?

Answer 17

Technician A only

Question 18

A customer complains that every time the lights are turned on in the vehicle, the dash display dims. What is the most probable explanation?

Answer 18

Normal behavior for VTF dash displays

Question 19

Technician A says that LCDs may be slow to work at low temperatures. Technician B says that an LCD dash display can be damaged if pressure is exerted on the front of the display during cleaning. Which Technician is correct?

Answer 19

Both Technicians A and B

Question 20

Technician A says that back up sensors use LEDs to detect objects. Technician B says that a back up sensor will not work correctly if the paint is thicker than 0.006 in. Which Technician is correct?

Answer 20

Technician B only

Question 21

Technician A says that metal-type tinting can affect the navigation system. Technician B says most navigation systems require a monthly payment for use of the GPS satellite. Which Technician is correct?

Answer 21

Technician A only

Question 22

Technician A says that the data displayed on the dash can come from the engine computer. Technician B says that the entire dash assembly may have to be replaced even if just one unit fails. Which Technician is correct?

Answer 22

Both Technician A and B

Question 23

A smaller-diameter tire causes the speedometer to read ________ than actual speed and ________ than actual mileage on the odometer.

Answer 23

Faster, More

Question 24

All OBD II vehicles use ________ as their ROM.

Answer 24

EEPROM (Electronic Erasable Programmable Read Only Memory)

Question 25

________ means that the information stored in the electronic chip is not lost when electrical power is removed.

Answer 25

Nonvolatile

Question 26

A speedometer should use no more than ________ volts of AC.

Answer 26

.5

Question 27

A ________ is a type of electric motor that is designed to rotate in small steps based on the signal from a computer.

Answer 27

Stepper Motor

Question 28

Voltage usage of a memory seat usually ranges between ________ volts.

Answer 28

0.5 to 4.5

Question 29

True or False?

Window switches are wired in series.

Answer 29

True

Question 30

Most electrically heated and cooled seats use a ________ (TED) located under the seat cushion and seat back.

Answer 30

Thermo-Electric Device

Question 31

A typical vehicle uses what kind of sensor for alarms and anti-theft systems?

Answer 31

Shock Sensor