Deck 11: Lighting Circuitslighting Circuits Repair and Diagnosis

Question 1

Condensation in the housing of a composite headlight system will cause the bulb to burn out.

Answer 1

False

Question 2

Technician A says if the ignition switch is placed in the RUN position before the timer circuit turns off the interior lights, the timer sequence is shut off and the interior lights turn off. Technician B says a switch in the handle will close the ground path from the actuator when either of the front door handles is lifted. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Answer 2

A

Question 3

Technician A says the headlight should turn off after the selected amount of time delay when a bright light is shone onto the photocell. Technician B says the headlights should turn on within 10 seconds when the photocell is covered, and the ignition switch is in the RUN position. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Answer 3

C

Question 4

Fiber optics are used in areas where bulbs would be inaccessible for service.

Question 5

The adaptive headlight system (AHS) is designed to enhance nighttime safety by turning  the headlight beams to follow the direction of the road as the vehicle enters a turn.

Question 6

The interior lights of a vehicle equipped with an illuminated entry system stay on even after the ignition switch is placed in the "on" position; after a short interval, the lights turn off. Technician A says the input signal from the ignition switch may be open. Technician B says the entry module may be faulty. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 7

The adaptive headlight system automatically switches between the high and low beam headlights.

Question 8

The photocell uses light to change resistance.

Question 9

Illuminated entry systems turn on the courtesy lights after the doors are opened.

Question 10

Technician A says fiber optics is the transmission of light through several plastic strands that are sheathed by a polymer. Technician B says fiber optics can only be used if there are no bends in the conduit. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 11

Technician A says fiber optics provide illumination of several objects by a single light source. Technician B says light rays travel through the plastic strands by means of external reflections. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 12

Technician A says the lamp outage module is a current measuring diode. Technician B says a lamp outage module may contain a set of resistors wired in parallel. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 13

A lamp outage module can monitor the operation of which lighting system?

A) Headlights
B) Taillights
C) Stoplights
D) All of the above

Question 14

Technician A says solid-state circuitry is used in headlight dimming systems to control beam switching. Technician B says headlight dimming systems can use mechanical relays to control beam switching. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 15

Technician A says when a fiber optic indicator is not operating, the cause could be a bend in the cable. Technician B says the cause could be the light source not operating. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 16

The adaptive brake light system selects different levels of illumination of the brake lights depending on conditions.

Question 17

If the parking brake is applied while the engine is running, the daytime running light feature is turned off.

Question 18

Daylight running lamp systems are being discussed. Technician A says the reduced intensity of the headlamps can be accomplished by increasing the duty-cycle of the power feed circuit. Technician B says that on some systems, the brightness of the lamps will increase as night approaches. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 19

Modern automatic headlight dimming systems use rheostats to control beam switching.

Question 20

A bend in the cable can result in a nonoperating fiber optic indicator.

Question 21

Automatic leveling headlamps uses a ____ that adjusts the headlamp reflector up or down for proper headlamp aiming.

A) stepper motor
B) spirit level
C) switch
D) thumb wheel

Question 22

The ____ system is designed to enhance night-time safety by turning the headlight beams to follow the direction of the road as the vehicle enters a turn.

A) adaptive headlight
B) headlight leveling
C) automatic dimming
D) night vision

Question 23

In computer-controlled headlight systems, the headlight switch is usually a(n) ____ switch.

A) resistive multiplex
B) high-side driver
C) double-pole, single throw
D) Multi contact

Question 24

Technician A says when replacing a halogen headlight bulb, touching the bulb with your fingers can shorten the life of the bulb. Technician B says the ignitor of an HID headlight provides the initial 10,000 to 25,000 volts to jump the gap. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 25

Which of the following lamp designs have the fastest activation time?

A) Halogen.
B) Neon.
C) Tungsten.
D) LED.

Question 26

____ occurs when electricity seeks a path of lower resistance and operates another component than the one intended.

A) Conductivity
B) High resistance
C) Illumination
D) Feedback

Question 27

In the SmartBeam system, the headlight intensity is based on which of the following:

A) Movement of the light.
B) Intensity of the light.
C) Location of the light.
D) All of these choices.

Question 28

A filament type lamp generates light through a process of changing energy forms called ____.

A) vaporizing
B) electrification
C) incandescence
D) conductance

Question 29

Brighter-than-normal lights can be the result of ________________ or improper lamp application.

A) improper circuit routing
B) high charging system output
C) excessive voltage drop
D) worn dimmer switch contacts

Question 30

Which of the following is NOT used to control the brightness of the instrument panel lamps?

A) Diodes.
B) Potentiometers.
C) Rheostats.
D) Pulse width modulation.

Question 31

On some turn signal systems a ____ is used to open and close the turn signal circuit at a set rate.

A) rheostat
B) diode
C) LED
D) flasher

Question 32

The "bulb failure" warning light of a vehicle is illuminated whenever the headlights are turned on. Technician A says this can be caused by an excessive voltage drop on the ground circuit of one of the park lights. Technician B says an incorrect bulb may be installed. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 33

Before the headlights are aimed, the vehicle must be checked for proper ____.

A) spirit level
B) bulb type
C) curb height
D) bulb center

Question 34

Technician A says the headlight switch may be at fault when none of the external parking and headlights turn on. Technician B says it may be caused by a faulty circuit from the battery to the switch. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 35

No matter the type of control used, the headlight system typically ____________ to prevent total headlight system failure if one filament burns out.

A) is wired in series
B) is wired in parallel
C) is activated by a sensor
D) has a back-up filament

Question 36

To test the photo cell, use a scan tool or a DMM to measure the ____ of the photo cell signal circuit to the BCM.

A) resistance
B) current
C) voltage
D) amperage

Question 37

Technician A says a poor ground on one of the headlamps will cause it to be dim. Technician B says AC generator output that is too high can cause headlights to be brighter than normal. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 38

Fiber optics is the transmission of light through polymethyl methacrylate plastic that keeps the light rays ____ even if extreme bends are in the plastic.

A) in solid state
B) dimmed
C) level
D) parallel

Question 39

The right headlight does not function on either high or low beam. Technician A says this could be caused by an open ground on the right side. Technician B says the B+ to the dimmer switch might be open. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 40

Illuminated entry systems turn on the ____ lights before the doors are opened.

A) low beam
B) parking
C) courtesy
D) side marker

Question 41

Technician A says that most active headlight systems will set DTCs if a fault is detected. Technician B says if scan tool activation tests of the active headlight system fails to initiate motor movement, the fault is with an input sensor. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 42

What inputs are used for the automatic headlight leveling system?

Question 43

Explain the operation of the basic automatic headlight dimming system.

Question 44

What forward facing input device does the SmartBeam system use?

Question 45

What should be done after servicing the automatic headlight leveling system?

Question 46

What could cause the headlights to flash on and off when driving on a rough road?

Question 47

Technician A says that the automatic headlight system may use a forward facing digital imager camera. Technician B says most adaptive (active) headlight systems require may require initialization or calibration after service. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 48

When today's technician performs repairs on the lighting systems, the repairs must meet at least what two requirements?

Question 49

As ambient light levels increase what will happen to the photocells resistance?

Question 50

Explain the function of the illuminated entry system.

Question 51

Describe the operation of the lamp outage module.

Question 52

Describe the operation of a typical computer-controlled headlight system.

Question 53

How does a headlamp lens redirect the light beam and create a broad, flat beam?

Question 54

Explain what a rheostat in the headlamp switch is and what function it performs?

Question 55

What does "curb height" mean?

Question 56

The courtesy lights do not turn on when the driver's door is open but illuminate when the FOB is used to unlock the doors. What is the MOST likely cause?

A) A faulty door ajar switch.
B) A faulty BCM.
C) A faulty headlight switch rheostat.
D) Faulty FOB.

Question 57

Many late-model vehicles have spirit levels built into the headlamp assembly. What are their purpose?

Question 58

Which of the following best describes the function of the bi-xenon system?

A) Uses double filament headlights to provide the high beam output.
B) Uses a chamber filled with multiple xenon gases that are ignited at different temperatures to provide high beam and low beam operation.
C) Uses multiple chambers of xenon gas that are ignited based on dimmer switch position. One chamber is for low beam, and both chambers are ignited for high beam.
D) None of the above.

Question 59

Technician A says headlight aiming of composite headlights may be based on measuring the beam position on a wall or screen. Technician B says an optical headlight aiming system may need to be used. Who is correct?

A) Technician A only
B) Technician B only
C) Both Technician A and B
D) Neither Technician A nor B

Question 60

Headlight leveling systems usually change the height of the projected beam by moving what component of the headlight assembly?

Question 61

On some center high mounted stop light (CHMSL) systems what is the purpose of the diodes?

Question 62

What is the purpose of the adaptive (active) headlight system?

Question 63

What is the advantage of using LED exterior lights?

Question 64

Explain how the filament type lamp produces light.

Question 65

List and explain the causes of dimmer than normal lights.