Exam 11: Lighting Circuitslighting Circuits Repair and Diagnosis

What does "curb height" mean?

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?

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

What is the advantage of using LED exterior lights?

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

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?

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?

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

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?

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?

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?

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

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

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

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

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

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?

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

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

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