Smart Start Ignition Interlock

Stereos Plus Accessories
325 W 16th St
Merced, CA 95340

#1 Ignition Interlock from $1.99/day*. Same-day installation available

Book your install now

Hours of Operation:

Day	1st Hour Block	2nd Hour Block
Sun	Closed
Mon	Closed
Tue	9:00am - 5:00pm
Wed	9:00am - 5:00pm
Thu	9:00am - 5:00pm
Fri	9:00am - 5:00pm
Sat	9:00am - 5:00pm

Services at this Location:

Installations
Calibrations

Book an Installation

With the thousands of locations across the nation, 24/7 customer support, no hidden fees and the most reliable device on the market, Smart Start Ignition Interlock devices are hands-down the best way to get you back on the road fast.

Get a quick and easy IID installation with Smart Start! Get started today!

¡Obtenga una instalación rápida y fácil de IID con Smart Start! ¡Empieza hoy mismo!

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By providing your information and clicking “Book Your Install Now”, I authorize 1A Smart Start LLC and it’s franchisees’ to contact me at the phone number and/or email address above via phone, text, and/or email using multiple and periodic autodialed and prerecorded calls and texts for marketing purposes. Not a condition for purchase. Message and data rates may apply. To opt-out of texts, replay “STOP,” and to opt-out of emails click the email unsubscribe link.

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By providing my information and clicking “Book Your Install Now,” I authorize [Insert Legal Name of Franchisee, distributor, or affiliate] to contact me at the phone number above via phone and/or text using multiple and periodic autodialed and prerecorded calls and texts for marketing purposes. Not a condition for purchase. Message and data rates may apply. To opt-out of texts, reply “STOP”.

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Or Call (209) 205-4098 Now!

¡O llame ahora al (209) 205-4098!

Why Choose Smart Start Ignition Interlock?

From $1.99/Day* - No Long-Term Contracts

Bi-weekly payment options designed to fit your budget.

IGNITION INTERLOCK COSTS

3,000+ Locations - Same Day Install

Quick installs by skilled technicians at convenient U.S. locations.

FIND A LOCATION

Discreet, Easy-to-Use Devices

Reliable, hygienic devices with guided tests and easy English-Spanish switching.

SMART START DEVICES

24/7 Knowledgeable State Program Experts

Multilingual support trusted by over 1 million people, ready when you need us.

TALK TO A PROGRAM ADVISOR

#1 Ignition Interlock Device Provider at Stereos Plus Accessories in Merced

We are upfront with costs and won’t hassle you with erroneous fees. Our hands-on, professional installers promise to take the best care of you and your vehicle.

We are here when you need us – Smart Start’s customer care center is open 24/7/365, including weekends and holidays. Smart Start Merced is located at Stereos Plus Accessories next to KFC off W 16th Street.

Call today to schedule your installation appointment at (209) 205-4098, or fill out our quick and easy online form.

Look for other convenient Smart Start locations in Merced, Modesto, or throughout California.

Frequently Asked Questions

The overall cost of an Ignition Interlock Device is a combination of installation fees, monthly service fees, and removal fees. Exact pricing varies by state. To get a quote today, call (800) 831-3299 to speak with a friendly Program Advisor.

Once you have scheduled your Ignition Interlock Device (IID) installation with Smart Start, you will need to bring the following to your IID installation appointment in California:

Two valid forms of identification—one of which should include a photo of you.
Proof of residence.
Any and all court documents that may be relevant to your Ignition Interlock Device requirement or your restricted driving period.
Vehicle registration. If you do not own the vehicle on which you’re installing the Ignition Interlock Device, or if that vehicle is not registered to you, you will need to bring a letter of permission from the registered owner stating that you are allowed to install an Ignition Interlock Device on the vehicle.
The vehicle on which you’ll be installing an Ignition Interlock Device (IID).

If you have any additional questions or concerns about the installation process or what is required for a successful installation, please don’t hesitate to call our customer care team at (800) 831-3299. You can also click on the chat window below to begin a discussion with one of our customer care advocates.

You may be able to service your Ignition Interlock Device at any Smart Start service center nationwide. However, we strongly suggest checking with your state authority in California before seeking service outside of your state. Find the nearest Smart Start service center here.

Typically, you will need to service your Ignition Interlock Device (IID) once every 30-60 days or as determined by your jurisdiction in California.

Ignition Interlock Device violation criteria can vary by state. Any and all of the following may constitute a violation in California:

A skipped rolling retest
Tampering with the Ignition Interlock Device in any way
Any breath sample that registers a BrAC above .02 percent
Missing your scheduled IID service appointment

Learn more about Ignition Interlock Device violations.

In California, you can pay for your Interlock Device calibration via credit card at the Smart Start service center at the time of calibration or via the online Client Portal.

Nearby Locations

Car Audio Warehouse

1249 N Golden State Blvd
Turlock, CA 95380

CLOSED – Opens at 9:00am Th

Services at this Location:

Installations, Calibrations

(209) 427-3615 More Details

Walts Auto Repair

1325 Angie Ave
Modesto, CA 95351

Services at this Location:

(209) 857-3997 More Details

Car Audio Depot

3012 McHenry Ave
Modesto, CA 95350

CLOSED – Opens at 9:00am Th

Services at this Location:

Installations, Calibrations

(833) 407-3448 More Details

See What Everyone Says About Our Ignition Interlock

Excellent TrustScore Rating

July 16, 2025

"Thank you Josie!! You are awesome!!! Great customer service and patience."

Gigi.

United States

July 16, 2025

"Professional, Quick Response Time, Very Knowledgeable & Helpful, Extremely Satisfied. Thank You!"

Daryl Fontana.

United States

July 16, 2025

"This is my first dui(without injury...i was parked, standing outside of my car when the cop approached me and told me i hav2 big eyes. I reaponded tnat yes,i hear that a lot, to which he replied: "no. I think you're drunk.'" Taken aback, I repeatedly offered to do whatever test he wanted even asked to do a breathalyzer.. hour lateri was finally allowws to so whicg Boqwz nthink the officwr sakdand it was only my prescribed meds in my system which their own tox lab clearly states none of which would have caused impairment...this entire ordeal has been absolutely baffling! I was never court ordered to install an IID and my charge isn't even alcohol related so this has been ridiculous to say the least! My attorney was even more shocked than myself upon learning the dld wants me to install this device, especially for such a long duration! "

Melissa D.

United States

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Find a location near you!

Smart Start Ignition Interlock

Hours of Operation:

Services at this Location:

Book an Installation

Fast-Track Your Installation

Want to speed up the installation appointment process?
We can get you a quote faster if you fill out the information below.

Or Call (209) 205-4098 Now!

¡O llame ahora al (209) 205-4098!

From $1.99/Day* - No Long-Term Contracts

3,000+ Locations - Same Day Install

Discreet, Easy-to-Use Devices

24/7 Knowledgeable State Program Experts

#1 Ignition Interlock Device Provider at Stereos Plus Accessories in Merced

Frequently Asked Questions

Nearby Locations

Car Audio Warehouse

Services at this Location:

Walts Auto Repair

Services at this Location:

Car Audio Depot

Services at this Location:

Get Started

Locations

Support

Partners

Contact Us

Find a location near you!

Smart Start Ignition Interlock

<img width="24" height="24" src="/wp-content/uploads/2024/05/hours-icon.svg"> Hours of Operation:

<img width="24" height="24" src="/wp-content/uploads/2024/05/calibration-icon.svg"> Services at this Location:

Book an Installation

Fast-Track Your Installation

Want to speed up the installation appointment process?We can get you a quote faster if you fill out the information below.

Or Call (209) 205-4098 Now!

¡O llame ahora al (209) 205-4098!

Why Choose Smart Start Ignition Interlock?

From $1.99/Day* - No Long-Term Contracts

3,000+ Locations - Same Day Install

Discreet, Easy-to-Use Devices

24/7 Knowledgeable State Program Experts

#1 Ignition Interlock Device Provider at Stereos Plus Accessories in Merced

Frequently Asked Questions

How much does an Ignition Interlock Device cost in California? What are the fees?

What do I need to bring to my installation in Merced?

Where can I go for service? Anywhere, or just within my state?

How often does my IID need to be serviced in California?

What constitutes a violation in California?

How can I pay for calibration?

Nearby Locations

Car Audio Warehouse

<img width="24" height="24" src="/wp-content/uploads/2024/05/calibration-icon.svg" alt="" style="margin-right: 5px;"> Services at this Location:

Walts Auto Repair

<img width="24" height="24" src="/wp-content/uploads/2024/05/calibration-icon.svg" alt="" style="margin-right: 5px;"> Services at this Location:

Car Audio Depot

<img width="24" height="24" src="/wp-content/uploads/2024/05/calibration-icon.svg" alt="" style="margin-right: 5px;"> Services at this Location:

See What Everyone Says About Our Ignition Interlock

Get Started

Locations

Support

Partners

Contact Us

Hours of Operation:

Services at this Location:

Want to speed up the installation appointment process?
We can get you a quote faster if you fill out the information below.

Services at this Location:

Services at this Location:

Services at this Location: