Chapter 37 POWERPOINT

Use the textbook to define these Technical Terms:

1. brake light switch

2. cruise control system

3. driver information center

4. power door locks

5. power window motor

6. rear window defroster

Use the textbook to answer these discussion questions:

1. Explain the basic difference between AM, FM, digital, and satellite radios.

2. Summarize the operation of a cruise control system.

Read the chapter summary below:

Summary

■ A basic radio system consists of an antenna, radio (receiver-amplifier), speaker(s), and power supply circuit.

■ An AM radio is designed to pick up a radio signal that varies in amplitude (strength).

■ An FM radio is designed to receive a radio signal that varies in frequency (fluctuating speed).

■ A digital radio uses analog signals that are compressed and digitized so more programming can be broadcast in a given spectrum.

■ Satellite radio operates off a radio (electromagnetic) transmitter that orbits about 22,000 miles (35,000 km) above Earth.

■ Just because the lights in the stereo are working does not mean the radio circuitry is getting power.

■ If you suspect a bad antenna (no signal coming from antenna lead), connect a known good antenna to the radio.

■ A faulty speaker will usually distort the sound of the radio. Sometimes, a power booster is added to the sound system to increase volume without sound distortion.

■ Radio noise is undesired interference or static (popping, clicking, or crackling) obstructing the normal sound of the radio station.

■ Power seats use several switches, electric motors, and drive assemblies to change the front seat positions.

■ Memory seats use a small computer, or ECU, which can be programmed to remember seat positions for several people.

■ A power window basically uses a control switch, reversible electric motor, circuit breaker, fuse, and related wiring to operate the door windows.

■ Power door locks typically use an electric switch and a solenoid or motor to operate the door lock mechanisms.

■ A power steering wheel uses an ECU, various switches, sensors, and motors to automatically tilt and telescope (extend or retract) the steering wheel.

■ A rear window defogger, also called a rear win- dow defroster, commonly uses a switch, relay, indicating light, and window heating grid.

■ A heated windshield system uses a special conductive film sandwiched inside the windshield glass.

■ An electronic cruise control system uses a computer, sensors, and a throttle actuator to maintain vehicle speed when highway driving.

■ Power mirrors commonly use tiny reversible electric motors to tilt the side view mirror glass into different positions.

■ A driver information center uses computer, a small speaker or digital display, and numerous sensors and switches to inform the driver of various conditions.

■ Vehicle degaussing, or vehicle demagnetizing, involves using a demagnetizing tool to remove a magnetic field built up around a vehicle’s body.