A6: F. Body
many late model vehicles use what to control the washers?
BCM
Many new vehicles actuate an electric servo motor with a cable attached to the throttle body or linkage to control speed. The speed is controlled by the ..
PCM
Sound distortion can also be caused by __________ , which is normally accompanied by....
Sound distortion can also be caused by damaged wiring , which is normally accompanied by lower than normal sound output
when diagnosing cruise control systems, the vacuum devices can be checked for operation and leaks with a handheld vacuum pump. When vacuum is applied, a diaphragm should move. the unit should be able to hold...
any applied vacuum for quite some time.
Active anti-theft systems usually refer to a system that...
arms when the system is activated or when a sequence of events happens that automatically arm the system.
explain how any computer system basically operates.
as with any computer system, these systems use various input sensors that send signals to the logic device that is then processed to possibly create an output action.
systems that can be manipulated with voice commands include the...(4)
audio system, navigation system, climate control system and mobile phone system.
If an airbag does not pass the modules system checks then it sends a code that will be flashed through the airbag warning light. if this light should also fail, then the system may...
be set up to sound a warning tone through the warning chime system.
why is it a good idea to wear safety glass when handling an air bag?
because deployed airbags may contain residual chemicals
typically bi-directional motor systems use reversible motors that are controlled by momentary contact switches. how else can these systems be controlled?
by a control module, if this is the case a scan tool can be used to assist the tech in troubleshooting
in older cars that ran sequences, this was accomplished with...
cams and the washer unit was physically attached to the wiper motor
when the wiper switch is turned on the relay winding is grounded through one set of switch contacts. this action does what?
closes the relay contacts
In some systems, the control module and the stepper motor are...
combined in one unit
it is important when repairing heated and cooled accessory systems that the tech know if the system to be repairs is...
controlled by a logic device
when power is supplied to thermal-electric strips they...
create heat when power is supplied to them
when the wiper switch is in the low speed position, the shunt coil is grounded through the second set of wiper switch contacts. Under this condition, current flows through the shunt coil and the wiper switch to ground. Current flow through the shunt coil ...
creates a strong magnetic field that induces more opposing voltage in the armature windings
In some systems, the control module and the stepper motor are connected in one unit. A cable is connected from the stepper motor to the throttle linkage. The control unit receives inputs from the ....(3)
cruise control switch, brake switch, and vehicle speed sensor (VSS).
many times a vehicle with an inoperative cruise control will also show the airbag light on, if...
damage to the clock spring has occurred.
parking assist systems are very complex and have ___________ integrated into their software.
diagnostics. techs will need to use scan tools to retrieve trouble codes and view data from the proximity sensors, which should be kept clean and free of dust
when diagnosing cruise control systems, the vacuum devices can be checked for operation and leaks with a handheld vacuum pump. When vacuum is applied, a diaphragm should move. the unit should be able to hold any applied vacuum for quite some time. After the vacuum is released, the...
diaphragm should relax and return to its "off" position
professional wire repair techniques should be used on all advanced electronic systems to prevent...
dirt and moisture from entering the circuits.
Many manufacturers recommend doing what before servicing any control module?
disconnect the battery cable
typically the procedure for disarming an airbag system involves...
disconnecting the negative battery post. then the supplemental inflatable system (SIR) fuse is removed from the fuse box. After this the tech should wait at least 10 min to allow the reserve energy to dissipate before working on or around the air bag system
for specifically detecting when the door is open some alarm systems are tied directly into the...
door ajar switch or have a switch in the door specifically detecting when the door is open
The reason for a separate alarm system switch is that some manufacturers have...
door handle switches, instead of door switches, that signal a control module to illuminate the interior lights
coverage zones known to an active anti-theft system can include...(5)
doors, trunk, hood, ignition, and a radio input
some vehicles have heated and cooled cup holders. Heating and cooling of the cup holders is accomplished by using...
electric grids that can add heat or remove heat, depending on the polarity of the current
a misrouted wire harness can lead to potential....
electrical failures do to rubbing against a piece of metal or wires stretched beyond their normal length.
operating through a heater grid inside the heated steering wheel, the current path travels through the clock spring/ribbon which allows...
energy to be delivered to a rotating steering wheel
A defective Vehicle Speed Sensor (VSS) might cause..
erratic or no cruise control operation.
the most likely cause for constant operation of a wiper system are...
faulty or stuck switch or the controlling circuit is shorted and the switch is by-passed.
the washer fluid motor operates a pump that...
forces washer fluid through the hoses to the washer nozzles.
sensors should always be mounted in their original orientation. Front airbag sensors are positioned toward the...
front of the vehicle and side air bag sensors are aimed toward the sides
many new shock and glass sensors now have two stage mechanisms which means the sensor will..
give a warning when the first threshold is broken and will sound the alarm when the second threshold is broken
Heated steering wheels operate through a ...
heater grid built into the steering wheel.
some wiper motors have permanent magnets in place of the field coils. these motors have a low speed and a high speed brush. in some of these motors, the low and high speed brushes are located where?
in some motors the low speed brush is directly opposite the common brush and the high speed brush is positioned between these two brushes
Faults that may be located with the back-up camera system may be located ....
in the camera, the display or the wiring harness
when checking the windshield washer system, check for low fluid levels and disconnected wires. then after that try to...
isolate the problem by disconnecting the hose at the pump and operating the system.
sound quality depends on a number of things. Rattles and buzzes are caused more often by....
loose speakers, speaker mountings, speaker grilles, or trim panels than by inoperative speakers.
when checking the windshield washer system, check for ...
low fluid levels and disconnected wires.
Most common false alarms are caused by...
misplaced sensors or sensors that have been adjusted to an overly sensitive level, such as shock sensors
how do most late model systems transfer the commands from the steering wheel mounted switches.
most late model systems use the clock spring or spiral cable to transfer the commands from the steering wheel mounted switches.
never use what to diagnose an airbag system?
never use a powered test light or an ohmmeter
Most factory installed systems are a passive only system, which means the system is designed ....
only to start the car when the correct key is inserted into the ignition.
Inputs such as VSS, brake switch, steering wheel inputs, cruise control set and on/off switches all feed info to the PCM which responds by...
opening the throttle and monitoring the speed through the VSS
In some systems, the control module and the stepper motor are connected in one unit. A cable is connected from the stepper motor to the throttle linkage. The control unit receives inputs from the cruise control switch, brake switch, and vehicle speed sensor (VSS). The control module then sends...
output commands to the stepper motor to provide the desired throttle opening.
what allows air from the A/C system to be routed to the seat cushions for vehicles with a cooled seats feature
perforated seats.
some wiper motors have what in place of the field coils?
permanent magnets
where is power and ground typically supplied to in a bi-directional motor system?
power and ground is typically supplied at the main switch for these systems.
vehicles equipped with heated systems require what? and how is the power supplied to these systems?
power is supplied to these heated systems through a relay because they require a large amount of current to operate
an open in a anti-theft system will...
prevent operation of the circuit
like all other electronic systems on a vehicle what should be followed on heated and cooled circuits?
professional wiring repair techniques.
A common luxury option of late is cruise control that slows the car down if a slower moving vehicle is approached. this system operates by using ...
radar technology that projects radar signals in front of the vehicle. This system objects in the path of the vehicle and is capable of slowing the car down.
when the wiper switch is in the low speed position, the shunt coil is grounded through the second set of wiper switch contacts. Under this condition, current flows through the shunt coil and the wiper switch to ground. Current flow through the shunt coil creates a strong magnetic field that induces more opposing voltage in the armature windings. This opposing force in the armature windings...
reduces current flow through the series coil and armature windings to slow the armature.
when the wiper switch is turned on the...
relay winding is grounded through one set of switch contacts.
what kinds of systems will always be controlled by a control module? (5)
remote keyless entry, voice-activated controls, backup camera, park assist and auto dimming headlights.
when checking the windshield washer system, check for low fluid levels and disconnected wires. then try and isolate the problem by disconnecting the hose at the pump and operating the system. if the pump does not spray, check for blockage at the pump. if no blockage exists...
replace the motor
In order to diagnose a computer system what tools are required
scan tools are required if problems occur. DMMs will also be necessary to test the electronic circuits of these advanced systems.
when the wiper switch is turned on the relay winding is grounded through one set of switch contacts. this action closes the relay contacts. current is the. supplied through these contacts to the...
series field coil and armature
to control speed, many newer vehicles actuate an electric...
servo motor with a cable attached to the throttle body or linkage to control speed
some anti-theft systems have active ultrasonic sound waves that...
set up an invisible shield to protect the interiors of convertibles.
sensors that can be adjusted to an overly sensitive level and cause a false alarm are known as..
shock sensors
when the wiper switch is in the low speed position, the ...
shunt coil is grounded through the second set of wiper switch contacts
if the wiper switch is in the high speed position, the ....
shunt coil is not grounded and the motor turns at high speed
If an active anti-theft system detects an attempt to break I to one of its coverage zones, it will...
sound the vehicles horn(s) and disable the starter
some modern vehicles have satellite radio. these fee-based radio systems receive signals from satellites through a...
special antenna that is different from the standard radio found in these systems
modern vehicles use a sequence when the washer is activated that...
starts the wipers and sprays the windshield for a certain number of cycles.
When the unlock button is pressed on the remote transmitter, the module then...
supplies voltage to the unlock relay winding to close these relay contacts and move the door lock motors to the unlock position.
what are two example of defective radio suppression devices that may cause static on the radio?
suppression coil on an instrument voltage limiter or a clamping diode on an electromagnetic clutch, may cause static on the radio
what happens when the driver activates the remote start system?
the BCM sends a signal to the necessary devices to make the engine start and idle.
If poor reception is experienced with a satellite radio system the tech should check ...
the antenna for problems and also check the antennae as wire.
in DVD entertainment systems what should be checked if the headphones do not perform as designated?
the batteries
static in the sound system may be caused by...
the charging system or the ignition switch
systems that assist the driver in parking maneuvers. when the sensors that are typically on the rear bumper detect a close object, what illuminates one or more indicators inside the car?
the control module
when the driver requests the heated system what directs the relay?
the control module directs the relay
In heated steering wheels how does the current travel through the heater grid built into the steering wheel?
the current path travels through the clock spring/ribbon.
what will door sensors do if they become rusted out or moving parts begin to wear?
the door sensors will start to set false signals to the alarm module
a short in a anti-theft system will cause...
the fuse in the circuit breaker to blow.
Many late model vehicles are equipped with various heated and cooled systems. the heated systems typically use what that create heat when power is supplied to them?
the heated systems typically use thermo-electric strips that create heat when power is supplied to them.
when checking the windshield washer system, check for low fluid levels and disconnected wires. then try and isolate the problem by disconnecting the hose at the pump and operating the system. if the pump ejects a stream of fluid, then...
the hoses are clogged
To signal when a door has been opened alarm system often tie into what circuit ?
the interior dome light circuit
how do reversible motors that are controlled by momentary contact switches work?
the motors change direction when the electrical polarity is reversed
if the wipers do not park properly, the....
the park mechanism inside the wiper motor may be at fault, the park circuit damaged, or the intermittent wiper unit damaged.
if the wiper motor fails to park or parks in the wrong position, what is probably defective?
the parking switch or cam
seats with blower motors installed to assist A/C routing should be cleaned routinely to prevent...
the perforated holes from becoming blocked
what circuit is the remote keyless entry module connected to?
the power door lock circuit
if a sound distortion concern is the chassis, all speakers on the same side of the vehicle will exhibit...
the same poor quality
sound distortion can be caused by ...
the speaker, radio chassis, or wiring.
high resistance in a anti-theft system will cause..
the system to work improperly.
In a passive only system what happens if the right ignition key is not used?
the system will disable the starter system, fuel delivery system, ignition system, or any or all of these systems.
when rattles and buzzes are heard check..
the tightness of all mounting and trim pieces
when the wiper switch is turned on the relay winding is grounded through one set of switch contacts. this action closes the relay contacts. current is the. supplied through these contacts to the series field coil and armature. under this condition...
the wiper motor starts turning
when the unlock button is depressed on the remote transmitter, the locks will unlock and the interior lights will illuminate on most systems. what happens after this operation?
then the remote keyless entry module will turn off the interior lights after approximately one minute or when the ignition is turned on
what do DMMs test in a very advanced system such as a computer system
they are used to test the electronic circuits
how do bi-directional motors change direction?
they change direction when the electrical polarity is reversed.
audio systems typically have three ways of working..
they either work well, work noisily, or not at all
what do some manufacturers often install to assist in moving cooled air through the seat cover?
they often install a blower motor at the bottom of the seat
many late model cars are equipped with dozens of comfort and convenience accessories such as power windows, power seats, power locks, trunk locks, pedal height motors, sun roofs, and moon roofs use bi-directional motors. how do these systems operate in a similar way?
they operate In a similar way because most of them use reversible motors that are controlled by momentary contact switches
Modern factory installed anti-theft systems typically program their systems 2 ways name both
they use a dedicated control module or design the functions into an existing module.
some remote keyless entry systems have the command "remote start". how does this system operate?
this remote start system operates using the same technology as the system that unlocks the doors and operates the theft deterrent system.
when the driver activates the remote start function the door will remain locked until the driver activates the unlock function. how must this system be programmed?
this system must be programmed in the same manner as the remote keyless entry system
In some systems, the control module and the stepper motor are connected in one unit. A cable is connected from the stepper motor to the...
throttle linkage
when the wiper switch is in the low speed position, the shunt coil is grounded through the second set of wiper switch contacts. Under this condition, current flows...
through the shunt coil and the wiper switch to ground.
when servicing a vehicle equipped with radar technology, techs should make sure that the...
transmitter and receiver are both clean and clear of obstructions.
the reception on fee-based radio stations can be interrupted when...
traveling near tall buildings and tree covered areas
cruise control systems are often a combination of...
vacuum-operated devices, mechanical linkages, and electrical components.
The exact procedure for disarming an airbag system...
varies from car to car
voice activation systems are integrated into the existing _________ __________ ______, which require use of a scan tool to diagnose
voice activation systems are integrated into the existing body electronic functions which require use of a scan tool during diagnoses
when the washer button is pressed, what is supplied through the switch to the washer motor?
voltage
if the motor fails to operate check for...
voltage and ground at the motor. This will isolate the problems location to the motor or the washer switch and wires.
Heads-up display systems project data from the instrument panel onto the...
windshield.it is built into the instrument panel and uses mirror technology to create the projected image.
if the wipers do not work at all, the...
wiper motor is bad or there is an open in the circuit
use of an ohmmeter should be restricted to circuits...
without connections to pyrotechnic devices.
what may cause static In the sound of an audio system
a poor engine ground or poor ground at the sound system components may cause static in the sound.
How can the blower motor be activated to assist in troubleshooting?
a scan tool
to diagnose a heated steering wheel you must use...
a scan tool to communicate with the control module
what sends lock and unlock signals to the remote keyless entry module?
a small remote transmitter, the vehicle only responds if the transmitter is within appropriate distance.
diagnose the air bag systems with...
a volt meter or the manufactures recommended diagnostic tools
some wiper motors contain what 2 types of field coils? and along with those it has a...
a wiper motor contains a series field coil, a shunt field coil, and a relay.
what are the two important tools that will allow a tech to properly test an anti-theft system?
a wiring diagram and a parts locator guide.
voice activation systems technology that is used in this system is...
adaptive to speaking styles and patterns
some late model vehicles have cooled seats. many of these systems include perforated seats which allow...
air from the A/C system to be routed to the seat cushions
what will happen in a bi-directional motor system if either power or ground is lost at the main switch?
all operation will stop.
some of these parking systems include an audible alarm that....
also warns the driver of the close proximity of an object.
when diagnosing cruise control systems, always check for what before testing the vacuum and electrical components?
always check for mechanic binding of the linkage
When carrying inflator devices be sure to hold them at a distance from the body and walk carefully to avoid falling. always store inflator modules face up or face down on the bench?
always store inflator modules face up on the bench and carry these components with the trim cover facing away fr the body.
what do many windshield washer systems have mounted in the bottom of the washer fluid reservoir?
an electric pump
a defective _________ with poor ground shielding can also result in static
antenna
when servicing the airbag system, always disconnect the battery negative terminal first and wait for the manufacturers specified time which is usually...
1-2 minutes
when diagnosing cruise control systems, the vacuum devices can be checked for operation and leaks with a handheld vacuum pump. When vacuum is applied what should move?
a diaphragm should move.
when diagnosing cruise control systems, vacuum devices can be checked for operation and leaks with...
a handheld vacuum pump
if an audio system does not work at all, the problem is most likely ...
a lack of power to the unit or a poor ground
If the wipers work intermittently, the most likely cause is ...
a loose wire or connector.
some wiper motors have permanent magnets in place of the field coils. these motors have...
a low speed and a high speed brush
