There are tons of new kinds of nav systems for late model cars, from Mercedes to Honda they are as varied as the cars they are in. The car navigation system over the years has become more and more advanced, for instance the Mercedes systems all use optical wiring that won�t work in any other car or system. Most of the new car radio and nav systems have specific software requirements for the systems to work correctly. If you are trying to install a factory in dash navigation screen into a car that did not come with it you may run into some issues.
The Nav unit will not take the information correctly and therefore cannot work properly if the software in the unit you are installing is not built and programed for your application. To be sure that any unit that you are planning on installing in your ride will fit, get the OEM number from the dealership. The OEM number is an exact number for the unit that will hook up in your vehicle without any reprogramming or modification to the unit.
Most in-dash nav units nowadays are part of a system and not just the stand-alone unit that can be seen in the dash they also have a under seat or trunk unit as well. If a new or old nav unit is not working it may not always be the part you think or the reason you think. If any of the parts in the system fail it will make the head unit not work. In the case of Mercedes the units are all calibrated to work in the original car and cannot be swapped into any other car. If you are having issues with your cars navigation system be sure you narrow down the issue before you start spending your hard earned cash.
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