OnStar Manual (Generation 6) - 2014 Chevy Cruze
Please note without knowing the VIN of DNV Vehicle it is a guess as to which Generation OnStar is applicable to her vehicle. GM Customer service said that 2014 Chevy Cruze could be either Generation 6 or 7 OnStar. Differences in terms of accuracy of GPS wouldn't necessarily differ depending on Generation but each additional generation adds user services to the platform (current generation is 10).
Short version info: GPS positional accuracy is a function of satellite signal strength and any potential obstructions due to location (i.e, tunnel or urban area with tall buildings etc.), weather (heat/cold/cloud cover etc.), radio frequency signal interference and cellular service quality. In general assuming good signal strength and weather and no interference from other signals then GPS in the US is accurate to within 30 ft. LE has special capabilities to use GPS with greater accuracy to within 10 ft.
Here is full manual: https://www.onstarfulfillment.com/pdf/EN_OnStar_Gen6_Manual.pdf
Here is excerpt covering GPS from Generation 6 manual:
GPS Issues
Global Positioning System
Vehicle positioning information is normally relayed to the OnStar Call Center when the OnStar button is pressed, during air bag deployments, or during Emergency Service button requests from the vehicle. Information about you, your vehicle, or your vehicle’s location may be used to administer OnStar services and respond to legal requirements or legal process.
OnStar Information Page 33
Positioning Capability Degraded if Satellite Signals Are Obstructed
Vehicle position is determined by receiving and interpreting signals transmitted by satellites. If the signals are obstructed, positioning capability could be degraded or lost. This situation would be most prevalent in urban areas where tall buildings are located. Tunnels, underpasses, parking garages, trees, and similar structures could also adversely affect positioning performance. Under these conditions, the system will operate but the OnStar Call Center could have difficulty identifying your current location. The last valid position obtained before the obstruction is retained, however, and can be sent. The OnStar Advisor may depend on you to provide verbal information regarding your vehicle’s location if such an obstruction of the satellites occurs.
Communications Issues
Privacy
Users of wireless communications are cautioned that the privacy of any information sent via wireless cellular communications cannot be assured. Third parties may unlawfully intercept or access transmissions and private communications without your consent.
Inoperative if Cellular Signal Is Marginal or Unavailable
Since OnStar uses the cellular technology for communication with the OnStar Call Center, it can only be operated in geographic areas where cellular coverage is available. Although nearly all of the North American population lives and works in cellular coverage areas, there are various rural and mountainous areas where coverage is marginal or does not exist. Cellular service is also subject to transmission limitations
Page 34 OnStar Information
caused by atmospheric conditions. OnStar service is only available in the 48 contiguous states, Hawaii, Alaska, and Canada. If a request for service occurs outside of these areas, communications may not be available, and the OnStar Advisor may not be able to help you.
Inoperative if Communications Service Is Inactive or Inoperative
OnStar uses a dedicated cellular communications service and will not operate if, for some reason, a cellular carrier has deactivated cellular service.
Inoperative if Cellular System Is Busy
In any area, the local cellular system can only handle a limited number of cellular calls at a given time. Once volume has reached the maximum limit, additional callers are denied access. If this situation occurs when an OnStar request for services is made, the OnStar system will automatically redial (a few times for an OnStar request for services or indefinitely for an Emergency button press).
Phone Operation at Temperature Extremes
In rare conditions the OnStar system may be exposed to extreme temperatures. If extreme temperatures are experienced during an emergency situation, the system will attempt a full power call for the prescribed period of time. During these times, the phone may not be capable of transmitting at full power when used for OnStar Personal Calling. Additionally, call quality may be slightly degraded at extreme hot or cold temperatures above 60 degrees Celsius (140 degrees Fahrenheit) or below -30 degrees Celsius (-22 degrees Fahrenheit).
OnStar Information Page 35
Radio Frequency Interference
The OnStar system is a radio communications system. The proximity to other radio signals created by other electrical devices may adversely affect the performance of the OnStar system.
Blasting Areas
The OnStar system incorporates a cellular wireless device. Observe restrictions and follow any regulations or rules.
Vehicle and Power Issues
Inoperative if Battery Is Discharged or Disconnected
OnStar is powered by your vehicle’s battery and will not operate if the battery is discharged or disconnected.
Potentially Inoperative if Vehicle Is in an Accident
If your vehicle is in an accident, some components could be damaged or disconnected, potentially rendering OnStar inoperative.
Add-On Electrical Equipment
The OnStar system is integrated into the electrical architecture of the vehicle. Do not add any electrical equipment (e.g., two-way mobile radio, CB radio, etc.) to your vehicle unless you check with your dealer first. Added electrical equipment may interfere with the operation of the OnStar system. Any damage would not be covered by your warranty.