Body Components, Trim, And Restraint Systems Flashcards
When replacing defective air bag system sensors, it is imperative to do which of the following?
“A. Ensure all arrows point forward
B. Replace the diagnostic module
C. Leave the battery connected
D. Reprogram the diagnostic module”
“Answer A
Most supplemental restraint system sensor have arrows on them to ensure proper installation. Arrows must point to the front of the vehicle in order for proper system operation in the event of a collision.”
A customer complains of a whistling noise at speeds over 60 km/h. Which of the following is a likely cause?
“A. Incorrect hood bumper height
B. Loose left side trim molding
C. Incorrect tie rod sleeve placement
D. Broken radiator shroud”
“Answer C
On a parallelogram-type of steering system that uses a tie rod sleeve, the sleeve is split. If it is positioned incorrectly, the air rushing past it while driving can act like a flute. Slight rotation of the sleeve to keep the split out of the wind path will solve this problem. “
What is the most effective way of finding water leaks in a passenger compartment? "A. Trouble light B. Smoke machine C. Electronic stethoscope D. Air nozzle "
“Answer B
The most effective way to trace water and wind leaks in a vehicle is to use a smoke machine. Smoke fills the vehicle and the technician is able to see the escape path. Electronic stethoscopes and tone generators can also be used if available. “
What could cause all power windows in a vehicle to become inoperative?
“A. Defective motors
B. Broken wire in right front-door jamb
C. High resistance ground for master switch
D. Malfunctioning express-down circuitry “
“Answer C
The only ground on most power window systems is located at the master switch in the driver’s door. If all windows become inoperative, check the wiring diagram and find the ground-point connection. “
What is the first thing that should be done with a door that appears to have sagged?
“A. Loosen lower hinge bolts to adjust door
B. Complete the up-down adjustment before the in-out adjustments
C. Adjust door striker to match door
D. Check for up-down hinge play “
“Answer D
Before making any adjustments to a door hinge, you must check to see that the hinge is not the cause of the sag. Lifting up on the door and checking for play is an effective way to check the hinges on the door. Hinges are to be replaced, not repaired. “
Which of the following is the most correct way to repair a broken door jamb wire?
“A. Solder the connection in the door jamb
B. Use crimp butt connectors in the door jamb
C. Run a new wire through the jamb and connect on both sides
D. Twist the wires together and tape “
“Answer C
Because the doors swing open and closed repeatedly, making wiring repairs in the door jamb is not effective. In the event of a broken wire, you should pull a new wire through and make the solder connections in areas where there is no excessive wire movement. “
How many closed sensors are necessary for air bag deployment?
“A. 1 forward and 1 safing
B. 2 forward and 1 safing
C. 2 forward only
D. 1 safing only “
“Answer A
The air bag system requires that one sensor be active on both the positive and negative side of the deployment loop. Therefore 1 loop and 1 safing sensor must be closed for air bag deployment. “
When replacing sensors on a vehicle that has deployed an air bag, it is important to:
“A. Test each sensor with a voltmeter
B. Torque all mounting bolts
C. Test each sensor with a self-powered test lamp
D. Ensure that the sating sensor is armed”
“Answer B
The sensors must be installed so that they are at the correct angle and position for accuracy in determining a collision. Torquing the mounting bolts ensures that the sensor will not move in its mounted position. “
The window on the passenger front door does not move up and down, but the motor is audibly working. Which of the following is the most likely cause?
“A. Binding window regulator
B. Broken window track
C. Window motor switch
D. Window is binding to the channels “
“Answer B
Since the motor is audibly working, the most likely cause is a broken window track where the window does not move (disconnected from the regulator) and the motor controls the regulator up and down without seeing the window move. “
What normally causes wind noise or whistling around the top of the windscreen?
“A. Door seals leaking due to the door being out of adjustment
B. Windscreen trim molding loose or not fully seated to the windscreen
C. Roof ditch hem seals do not extend fully forward to the windscreen
D. Bent metal window flange “
“Answer B
Wind noise is usually caused by a piece of trim or other obstruction that interferes with the normal passage of air around the vehicle. Loose windscreen molding would cause such a noise. “
After installing a remote starting device, the vehicle will intermittently shut off only while in remote start mode. Which of the following is a likely cause?
“A. Magnetic interference
B. Defective hood pin switch
C. Tripping circuit breaker
D. Defective remote start module”
"Answer A Many remote starter manufacturers include a grounding style hood pin switch to deactivate the system when the hood is open to prevent injury. If the hood wire is not shielded, it is possible to pick up magnetic pulses from the ignition system. The induction could trick the remote starter module into thinking the hood was open and cancel the start. This would not affect regular key operation. "
A vehicle with a factory-equipped theft-deterrent system will start and then shut off 2 seconds later. Which of the following is more likely to be defective?
“A. Transmitter
B. Receiver module
C. Body controller
D. Ignition key “
“Answer D
Most factory theft-deterrent systems use technology built into the key. This has evolved from a resistor pellet to a built-in-radio frequency transmitter. To immobilize a vehicle, the system will usually shut off fuel to which the PCM has control. In this case, a defective key could cause the vehicle to initially start and then shut off because the wrong message, or no message, was received. Key readers are available and are usually dealer equipment.”
What activates an SRS (supplemental safety restraint) air bag if the vehicle battery is destroyed on impact?
“A. Engine ECM
B. Backup capacitor
C. Inertia
D. Backup battery”
“Answer B
A backup capacitor is used to activate an SRS air bag in the event the vehicle battery is destroyed on impact. When the SRS circuit is closed on start-up, the SRS dash light is extinguished when the backup capacitor is charged. “
When a passenger’s seat belt is unfastened and the ignition circuit is on, what else should be true?
“A. Engine will not start
B. SRS air bag circuit will not activate
C. Dash warning light is illuminated
D. Fault code is logged in engine ECM “
“Answer C
When an active seat belt system is used, it is mandatory to have a dash alert when a seat belt is not fastened. “
When attempting to identify a plastic material, which of the following will give off dense black smoke when ignited?
“A. ABS group plastics
B. Polypropylene group plastics
C. Vinyl group plastics
D. Nylon group plastics”
“Answer A
Only ABS group plastics will give off dense black smoke when ignited: if attempting to identify a plastic, break off a small piece, ignite and avoid inhaling the fumes as it burns. Polypropylene burns giving off little visible smoke; vinyl and nylon emit little smoke and burn with a bluish flame. “
