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If you have been charged with a DUI conviction, a court may mandate the installation of an Ignition Interlock Device (IID) in your vehicle. If you have found yourself in this situation, you may want to understand the steps an IID provider will go through to install an ignition interlock device. In this blog, learn about the installation process and maintaining the IID.  If you are curious about vehicle requirements for an IID, check out the general information provided in Ignition Interlock vehicle requirements. 

In most jurisdictions, an IID installation must be carried out by a certified professional.  

Choosing the Right Ignition Interlock Device 

When selecting an Ignition Interlock Device (IID), you may want to consider its compatibility and functionality for you. You will also want to familiarize yourself with the pertinent State Laws and the ignition interlock device service providers that are certified in the State applicable to your situation.  

The market offers a diverse range of IIDs, each with unique features. Some devices may have faster boot-up times or interfaces you find more user-friendly. Therefore, it is important to evaluate the IID’s features in relation to your specific needs. 

Additionally, you might review user testimonials to gain insights into the real-world performance of various IIDs. Evaluating customer feedback regarding the Ignition Interlock system device’s ease of use and overall user satisfaction may aid in making an informed decision. 

By considering device features and user experiences, you will be well-positioned to select an IID that meets your personal requirements. 

Step-by-Step Ignition Interlock Installation Process 

Once you’ve chosen your ideal Ignition Interlock Device and service provider, it’s time to get it installed 

Please be aware that the installation process can differ based on the service provider, type of vehicle, and local regulations among other factors. The steps outlined below represent a general approach that a service provider might follow to install your device, and the steps below refer to non-electric vehicles as they follow a slightly different process. However, the actual process may vary depending on the specific circumstances related to the provider, the vehicle in question, and the governing laws of the area. 


  1. Preparing for IID Installation 

In preparation for installing your Ignition Interlock Device, the technician will gather the necessary tools, which may include screwdrivers, pliers, and wire strippers. Safety measures will likely require them to identify and disconnect the motor vehicle’s battery. 

  1. Connecting the Device to the Ignition System

Your technician will then connect the device to your motor vehicle’s ignition. This is a very important step since it deals with the ability to start your car. Taking time to properly connect and secure the wires will help to keep the wires from fraying or disconnecting. Each Ignition Interlock installation should undergo a thorough inspection from the technician in order to proceed to the next steps. 

  1. Calibration Process & Breath Test

Your technician will then reconnect the vehicle’s battery and power up the device. As they connect to our service software, the device will be configured with settings specific to your requirement such as breath sample duration and tolerance levels set by the state. 

Next, they’ll conduct a test blow into the device to confirm it accurately registers and analyzes the breath sample. This calibration ensures that the device responds appropriately to different alcohol levels. 

Getting Help for Installation 

At RoadGuard, we want to make the device installation process as easy as possible for you. Check out our Ignition Interlock installation service offering, and we’ll help you find a service center near you. Also, we’ll help you set an appointment for your device installation and answer your questions about how long it takes and what to expect.  

Maintaining State Laws Compliance 

Regular reporting and calibration may be required for compliance with the requirements in the jurisdiction applicable to you. You can schedule appointments for calibration with the service center.  

Click here for some general information about state DUI laws.  This information may be dated and may not reflect the most current legal developments.  You should reach out to your attorney for advice applicable and appropriate to your jurisdiction, your particular situation, and the specific course of action you should follow. 

Tips for Device Maintenance 

Here are some quick tips to keep your device functioning properly. 

  • Wipe down your IID regularly with a damp cloth. (Avoid using harsh chemicals) 
  • Keep your device out of direct sunlight. 
  • Avoid damaging the cables. (Keep it in your passenger seat) 
  • Avoid getting your device wet. 
  • Keep the mouthpiece clear of debris. (Food, trash, tobacco, etc.) 

Look at your device manual, or feel free to contact your service center if you ever have any questions. You’ll also want to familiarize yourself with error codes for effective troubleshooting.  

Installation with RoadGuard 

With an IID, understanding the installation process, selecting the right device, and adhering to ongoing maintenance pays off in terms of reclaiming your unrestricted driver’s license. RoadGuard is your go-to resource for information, assistance, or to find a range of Ignition Interlock Devices.  

Safe travels on your journey towards responsible and sober driving!  

If you ever have any questions, feel free to reach out. 

The information in this blog is for general informational purposes only. Information may be dated and may not reflect the most current developments. The materials contained herein are not intended to and should not be relied upon or construed as a legal opinion or legal advice or to address all circumstances that might arise. You should contact your attorney to obtain advice with respect to any particular legal matter.  Only your individual attorney can provide assurances that the information contained herein – and your interpretation of it – is applicable or appropriate to your particular situation.  Links to any third-party websites herein are provided for your reference and convenience only; Roadguard Interlock does not recommend or endorse such third party sites or their accuracy or reliability. Roadguard Interlock expressly disclaims all liability regarding all content, materials, and information, and with respect to actions taken or not taken in reliance on such. The content is provided “as is;” no representations are made that the content is error-free. 


  1. NCSL. State Ignition Interlock Laws. 
  1. RoadGuard. Interlock Device. 
  1. RoadGuard. Interlock Device User Manuals.