An ignition interlock device is a small breath screening device wired into your vehicle’s ignition system. It asks you to provide a breath sample before the engine will start, then asks again at random intervals once you are driving. If the Ontario Ministry of Transportation has placed an ignition interlock condition on your driver’s licence, that handset is what stands between you and the road.
The MTO tells you when the program applies to you. A letter arrives, it names your stream (Stream A, B, C or D), and it sets your dates and your conditions. Everything after that is logistics: gather the paperwork, pick a service centre you can actually get to, book the install, then settle into a rhythm of Service visits every 30 to 60 days until your interlock period ends.
Almost all of the delay drivers run into is avoidable. It comes from booking late, turning up without proof of ownership, or picking a service centre an hour away and then missing an appointment in February.
Key points
- The device requires a breath sample before the engine will start, and it prompts a rolling test at random while you drive. Every result is stored and passed to your monitoring authority.
- Your MTO letter is the document that matters. It names your stream and sets your dates, so read it before you phone anyone.
- Enrolling costs nothing, even if you are not ready to book an install date yet.
- Return to your service centre every 30 to 60 days for Service. Missed and late appointments get recorded, and they can extend your ignition interlock condition.
- Removal is not automatic. Confirm with the MTO that you have met the terms of the program, then book a removal appointment.
How ignition interlock devices work
The Smart Start Canada handset is a compact unit with a keypad and a tri-colour display, connected to your ignition. You blow into the mouthpiece before starting the vehicle. If no alcohol is detected, the car starts normally. If the reading sits at or above the preset limit, the engine stays off.
Starting the car is only the first check. While you drive, an approved ignition interlock device prompts rolling re-tests at random. You get an audible tone and a few minutes to provide a breath sample from the driver’s seat, without pulling over.
A missed or failed rolling re-test does not shut off a running engine. It does log the event, and it can set off your horn honking and your lights flashing until you pull over somewhere safe and give a clean sample. Smart Start’s device has no hum feature, so you blow and nothing else; there is no knack to learn beyond steady pressure. The handset, the display and the tones are covered in more depth in how an ignition interlock device works.
Image alt text: A driver in the driver’s seat holding a small handheld breath testing unit beside the steering wheel, autumn trees blurred through the windscreen
What the device records
Every start-up test, every rolling test, engine starts and stops, disconnections and any sign of tampering all go into the device log. At each Service visit a technician downloads that log and forwards it to your monitoring authority.
Clean data keeps your program moving on schedule. Flagged events are what extend it.
Who Ontario’s ignition interlock program applies to
You do not have to work out your own eligibility. The MTO notifies you when the program applies to you, and the letter you receive tells you which stream you are in and what that stream requires. Read the full terms of an ignition interlock condition in Ontario next to your own letter; where the two seem to differ, the dates on your letter are the ones to work from.
Check two things on that letter before you call anyone. The first is your stream, because the steps are not identical across all four. The second is your dates. Most streams carry an install deadline, though it does not apply to every stream, so work from the date on your own letter rather than from what a friend on the program was told.
If anything on the letter is unclear, phone the MTO before you book. Arriving at a service centre with the wrong paperwork costs you the appointment.
What to bring, and what to sort out first
Eligible drivers in the MTO stream have a short list to work through before install day:
- Your MTO letter showing your stream and your ignition interlock condition
- Proof of ownership for the vehicle where the device will be installed, or a completed permission-to-install form if the vehicle is not yours
- Confirmation that any fees you owe the MTO are cleared, at least two business days ahead of your appointment, if applicable
- Registration with Back on Track before your install date, if applicable to your stream
- Yourself, in person, because the appointment includes blow training and paperwork you have to sign
If your program reached you some other way, say so when you phone to book. The booking agent will tell you which document to bring instead.
Image alt text: A service technician in navy coveralls standing at a reception counter, pointing at a clipboard form while a customer in an olive winter parka and scarf reads along
Choosing an ignition interlock service provider in Ontario
Proximity matters more here than most drivers expect, because you will be back at the same place every 30 to 60 days for two or three winters’ worth of appointments. Pick the centre you can reach on a bad morning.
You can find your nearest Ontario service centre before you phone. Live customer care answers 24/7, which matters more at 6am on a Sunday than it sounds like it should.
When you compare any approved provider, ask three things: how soon can they book you in, do their service hours fit around your work, and what is included in the program rather than billed separately.
Install day
Getting the device installed usually takes about an hour, though it runs longer on some vehicles. A certified technician mounts the handset inside the cabin, wires it into the ignition, and leaves no visible damage to your dashboard or wiring. Run through what to confirm before your Ontario install appointment the day before you go.
Then comes the part drivers underrate. The technician trains you on the device: how hard to blow, what each tone means, how to answer a rolling test, and what to do after a lockout. Weak or rushed breath technique causes most of the failed tests in a driver’s first 2 weeks, and five minutes of attention here fixes it.
Image alt text: A technician kneeling in the open driver’s door of a car in a service bay, wiring a device under the dashboard with a wire loom and hand tools laid out on the seat
Service every 30 to 60 days
Bring the vehicle back to your service centre every 30 to 60 days. The technician downloads your log, checks the device over, and services it. This visit is not optional, and it is the single easiest thing to let slip.
Missed appointments and tampering are the two things recorded as program violations, and either can extend your ignition interlock condition. If you are going to be away, phone your provider early; the device allows a lockout code that can temporarily extend a service appointment, but that is a safety net, not a plan. Anything specific to your own condition, confirm with the MTO.
Daily use, and Ontario winters
Winter is the real test of this program, and not because the device is fragile. Warm-up is quick in normal conditions and slower in deep cold. The fix is simple: disconnect the handset and take it inside overnight when it is bitterly cold, and it will be ready when you are. Smart Start’s Smart Idle option also lets you leave the vehicle idling on a cold morning without completing another test.
A few habits cover the rest of the year:
- Blow steadily rather than forcing a hard burst of air
- Keep the handset out of the direct blast of a heater vent
- Store a spare mouthpiece in the glovebox
- Leave 15 minutes between mouthwash or hand sanitizer and a breath test, since both contain alcohol
- If you do get locked out, wait a few minutes, rinse with water, and test again
Some ordinary things trip the sensor when you have not consumed alcohol at all, and what causes false positives covers the usual culprits. There is a shorter list of foods to avoid before a breath test that catches most drivers out at least once. Beyond the device, getting a vehicle ready for an Ontario winter matters the same for you as for anyone else: four matching winter tires, a tank kept at least half full, and washer fluid rated to -40.
Image alt text: A driver in a winter coat, toque and scarf sitting behind the wheel of a blue car on a frosty residential street at sunrise, breath visible in the cold cabin
What the ignition interlock program cost depends on
Costs vary by province, by program length, and by what is bundled into the package rather than billed on its own. You will normally see the install, the recurring Service visits, and the removal itemized separately. In Ontario, the Smart Start package includes device insurance and the Smart Idle feature.
Rather than quote figures that change, current details are on the Ontario program fees page. Two things there are worth knowing now: enrolling itself costs nothing, so you can get into the program before you have settled on an install date, and missed or late Service appointments can carry an extra charge on top of the effect on your condition. Staying on schedule saves you twice.
Getting the device removed at the end of your interlock period
Removal does not happen on its own the day your interlock period ends. Confirm with the MTO that you have met the terms of the program, then book a removal appointment at your service centre. Smart Start tracks upcoming removal dates and will send you a reminder, but confirming with the ministry is yours to do.
The technician takes the device out and restores your vehicle’s original wiring. The MTO then updates your record to show the ignition interlock condition has been lifted and your full driving privileges restored. Keep the removal paperwork. It is the fastest way to settle an administrative question a year later.
Frequently asked questions
How do ignition interlock devices work?
You provide a breath sample before the vehicle will start. If no alcohol is detected, it starts normally. While you drive, the device prompts rolling re-tests at random intervals, and every result is recorded for your monitoring authority.
Can I drink alcohol and still pass a start-up breath test?
There is no reliable way to assume you will. The device reads what is on your breath, and how quickly that clears depends on timing and on your own body. If you are on the program, the low-risk approach is to avoid alcohol before driving entirely.
What happens if the device locks me out?
Wait a few minutes, rinse your mouth with water, and test again. Lockouts are usually a technique or a residual-mouth-alcohol problem rather than a device fault. If it keeps happening, call your service provider rather than working around it.
Can someone else drive my vehicle while the device is installed?
Usually yes, but the device still governs every start and every rolling test, and everything is logged against your record. Anyone who drives the vehicle needs to know how to use it properly.
Can I drive a work vehicle on the program?
Ask the MTO. Vehicles you drive regularly, including some commercial vehicles, may need an ignition interlock device installed as well, and the answer depends on your stream and your employer.
How do I plan work and travel around Service appointments?
Book each Service visit well in advance and pick a centre you can reliably reach in winter. If you know you will be away, phone your provider early to reschedule instead of letting the appointment lapse.
What paperwork should I keep during the program?
Keep your MTO letter, your install and Service receipts, and your removal paperwork. That set answers almost any timing or clerical question that comes up later.
Book your install with Smart Start Canada
Smart Start Canada runs 27 service centres across Ontario and has handled more than 1.1 million installations. If you are ready to book, or you just want someone to read your MTO letter with you and explain what your stream requires, get in touch with our Ontario team and we will take it from there.
Disclaimer: This article provides general information only. Ignition interlock program rules vary by province and territory and change over time. Always confirm current requirements directly with the Ontario Ministry of Transportation or Smart Start Canada before makin