IID

Ignition Interlock Device

In extreme weather, can I go start my car and let it run with the heater or air conditioner on, until the car warms up or cools down?

No.  The IID will randomly ask for breath tests (“random retests”) while the vehicle is running.  If you fail to do the retest within 10 minutes, the horn will sound repeatedly and the headlights will flash until the vehicle is turned off.  The IID will log this as failure to provide a “random retest” which may lead to a permanent lockout state.

What is a “swap out”?

Some manufacturers perform “swap outs” instead of requiring you to go to an installer every 30 days.  The manufacturer will send you a new unit every 30 days, at which time you will remove the current device, and replace it with the new device.  When the manufacturer receives the device you removed, they will:

  • Review the data recorded in the device’s memory.
  • Inspect the device for indications of tampering.
  • Forward data reports to both DMV.

Does the IID need to be serviced or maintained in any way?

Yes.  Once installed in your vehicle, the IID must be calibrated and inspected by a certified installer, or “swapped out” (if applicable), every 30 days for the duration of the terms and requirements of an RDL.  The inspection is done to make sure the IID is working properly and to detect any issues of non-compliance.  At the time of inspection, the installer will:

  • Review the data recorded in the device’s memory.
  • Inspect the device for indications of tampering.
  • Calibrate the device.
  • Forward data reports to both DMV.

Why do the lights flash and the horn blow if I fail a “random retest”, or if I do not provide a breath test during the “random retest”?

If you have failed the “random retest” breath test, or if you do not provide a breath sample for a “random retest”, the flashing of lights and sounding of the horn is a mechanism of alerting law enforcement who are in the area you are travelling.  It is a warning that they should conduct a traffic stop on your vehicle.

What happens if I do not provide a breath test during a “random retest”?

If you fail to do the retest within 10 minutes, the horn will sound repeatedly and the headlights will flash until the vehicle is turned off.  Once the vehicle is turned off, the IID will not allow you to restart the vehicle within 3 minutes without taking an initial breath test. The IID will place your vehicle in a permanent lockout state; the vehicle would have to be towed to the installer for service before you can operate it again.  

What is a “random retest”?

To prevent a driver from having someone else blow into the IID to start a vehicle, and to prevent a driver from drinking while driving, the IID requires the driver to submit to random retests at variable intervals after a driver has passed an initial breath test and started the vehicle.  The IID will signal you to take a retest within a certain amount of time after starting your vehicle.

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Vermont Department of Motor Vehicles
120 State Street
Montpelier, VT 05603-0001

Monday-Friday: 7:45am-4:30pm
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