Accessories Review Questions
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Mechanical Instrument Clusters use ? 2 points
- the current flowing through the sending unit or pick up sensor to activate the gauges and/or warning lights.
- analog gauges
Electronic Instrument Clusters use ? 2 points
- microprocessors to monitor the resistance values of various sensors.
- use analog, digital display or a combination of both.
Identify the 3 analog gauges design
balancing coil, air core and stepper motor design.
Operation of a Stepper Motor
- operates by a rotating magnetic field in stationary winding.
- do not use brushes and commutators, as they are usually controlled by a microprocessor electronically switching a set of stationary electromagnets.
- used in automotive for applications such as instrument panel controls and air conditioner controls.
The rotor of a stepper motor gauge is composed of a(an):
A balancing coil gauge operates on the principle of:
A flashing MIL (Malfunction Indicator Light) indicates what ?
- informs the driver that a problem exist in the engine, fuel or emission control system.
- that continued operation of the vehicle could damage the catalytic converter due to excessive raw fuel in the exhaust stream.
Identify the four problem areas that may turn the brake warning light on
- park brake application
- hydraulic brake system failure
- brake fluid level is low
- ABS is malfunctioning
The switch controlling the seatbelt warning light & audible chime is usually located in the:
Driver's seat belt buckle.
Speed Control Systems or Cruise Control are designed ?
are designed to maintain a desired vehicle speed (set speed) under normal driving conditions.
Most speed control systems do NOT engage below approx.
40 kph (25mph) or above a programmed max. speed.
The SCM (Speed Control Module) disables speed control when transmission is engaged in the _____, ______ & ______.
park, neutral and reverse.
- Negative Temperature Coefficient thermistor, meaning its resistance decreases as temperature goes up.
- means they conduct current more readily when they are hot than when they are cold.
What are two methods in repairing Defogger Grid line or Terminal Lead ?
Conductive Adhesive Epoxy Repair & Soldering
In a heated glass system, current flowing through the _________ of each of the ________ produces the heat necessary to clear the glass.
What type of material is used to make a seat heating element ?
A wired grid
While testing an open defroster grid line, the test light will:
display full brilliance up to the point of the open.
Before attempting a repair, a damaged gird area should be carefully cleaned with a:
piece of fine steel wool.
What type of circuit is the rear window defrost grid ?
A parallel circuit
Why is it important to heat the glass before attempting a solder repair on a rear defogger terminal ?
To prevent the glass breaking due to heat stress.
All remote entry transmitter operate on the same frequency. True/False
Keypad entry or remote entry systems eliminate the need to carry a door key. True/False
An encoded key contains a transponder that transmits a special code to the reader/exciter module. This type of transponder:
generates its own power from the reader/exciter's magnetic field.
The instrument panel light do not operate, but the tail lamps and marker lights are okay, this could be caused by:
a faulty light dimmer in the headlight switch.
In normal operation, the head lamps are wired in:
The turn signal and the park/tail light use a ___________ bulb.
What is a "flasher" ?
is a bimetal strip that opens when current heats the bimetal and closes when it cools.
A stop light & the signal light use the _____ bulb filament.
Dimmer Switch - 3 points.
- connected in series with the headlight switch and directs voltage to either the low or high beam headlights.
- usually built into the steering column.
The conventional bulb or sealed-beam w/ a tungsten filament sealed in an inert gas burns out very quickly when exposed to air.
- filament surrounded by halogen gas under pressure.
- max. brightness is maintained for the life of the bulb.
- lasts longer and uses less wattage for the same amount of light produced.
- Light-emitting Diodes
- require a very small amount of current to operate and hav virtually infinite life.
What bulb should you avoid direct contact with skin - having oil on them ?
Most electrical testing should be done using a ____________.
Park Mode (wipers)
When the wipers are at the bottom of their sweep (park position)
Why must an infant carrier not be installed in the front passenger seat position ?
The passenger air bag deployment could kill an infant.
What two things do impact sensors verify ?
- severity of collision
- Positive Temperature Coefficient
- higher resistance at high temperature
- which means they conduct current less readily when they are hot than when they are cold.
Balancing Coil Gauge (Operation)
- operate on the interaction of opposing magnetic field created by 2 electromagnets.
- Low Reading Coil & High Reading Coil.
- The resistance of the sending unit controls the amount current to change, which in turn causes the gauge indicator needle to move to the right or to the left.
- some balancing coils use a 3rd electromagnet called the a bucking coil & wired in series with the high reading coil.
What approx. speed is required in a collision to activate the SIR system ?
Where is the diagnostic module usually located ?
The diagnostic module is usually located under the dash.
What is the total time for impact to full deployment ?
The total time is less than one second.
List 4 components that are housed inside the inflator module.
What gas is produced when the chemical in the generant is heated ?
What are three warning light conditions ?
- does not come on
- does not go out
Define Passive Restraint
Passive Restraint mean no driver or passenger action is required.
In a font-end collision, list three sequences of operation of system components
- crash sensors detect
- igniter ignites
- bag inflates
where does the igniter receive its electrical current from ?
What is an Active Restraint System ?
Occupants are required to fasten restraints
Frontal impact deployment must occur _________.
within the 60 degree window.
For both side impact airbags to deploy _______________.
- there must be an impact on both the driver side & the passenger side.
- left and right side impact air bags are operated by independent systems.
Passive Restraint System components consists of ? 5 points
- Impact or crash sensors
- diagnostic module
- a clockspring
- a driver air bag module
- passenger air bag module.
detect impact direction and severity and signal the inflator module to deploy.
Two sensors must be activated in order for the air bag to inflate:
- one primary sensor, and a safing or aiming sensor
- must work together to trigger the system.
Primary sensor is a device designed to close _______________.
to close an electrical circuit when predetermined vehicle impact levels are detected.
The safing or arming sensor is usually _______ in a sealed assembly, and is usually mounted inside _________.
sealed assembly, diagnostic module.
What is the by-product of air bag deployment ?
Sodium Hydroxide Dust
provide a low resistance path to the other terminal and not allow current to flow past the connector. This prevents accidental deployment.
Seat Belt Pre-Tensioners
- are used to tighten the seat belts during a front or side impact.
- controlled by Air Bag System Diagnostic Module (AMSD)
When carrying a live inflator module, make sure _____________.
the bag trim cover are pointed away from you in case of accidental deployment.
What are the steps in centring the Clockspring ?
- Step 1: Rotate hub fully counterclockwise
- Step 2: Rotate hub 2 1/2 turns clockwise
Power accessory motors all use:
permanent magnet motors.
How many permanent magnet motors does a six-way power seat system use to move the seat to its position ?
What is the purpose of the power liftgate pinch sensors ?
allows reversal of the liftgate if there is an obstruction when closing.
Power liftgates only operate when the transmission is in ______ or _______.
park or neutral.
What is the purpose of the motor clutch on power sliding door systems ?
It allows the operator to manually open and close the power sliding door.
If a window motor does not run, _________________________.
unplug the motor and check for power and ground at the harness connector when you activate the switch. Also check voltage drop across the motor.
this reveals if high resistance elsewhere in the circuit is reducing the voltage available to the motor when the circuit is activated.
Door Lock Motor Test
Check the motor for continuity w/ an ohmmeter and replace it if there is an open circuit.
Door Lock Switch Test - 2 tests
- Test the door lock switches for continuity w/ an ohmmeter and pin-out or function chart.
- Measure the voltage drop across the switch while you activate the circuit to check for high resistance in the switch contacts.
Content Theft Deterrent Security System - wht are they designed for ?
- they are designed to protect valuables situated within the vehicle.
- they can detect an attempt at unauthorized vehicle entry and can activate an alarm.
Vehicle Theft Deterrent Security Systems - wht are they designed for ?
are used to prevent vehicle thefts. In most cases the fuel system or the ignition system is disabled to prevent the vehicle from being driven away by an unauthorized person.
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