If you provide a positive a positive breath sample, your vehicle will not start.  The IID will then call for a retest within 5 to 15 minutes of the positive breath sample.  A failed start-up retest will lead to your vehicle not working.  If this happens, you must have the device serviced within 5 calendar days to avoid your vehicle becoming inoperable.  Also, you will be required to have the device serviced with 5 calendar days if you fail/miss a second rolling test after having failed/missed the initial rolling test or miss a service visit wit the company that installed the device.