All Interlock Programs can have an unfortunate ending. While it is true that an occasional drunk driver may cause a problem for an Interlock Program to fail, for the most part problems with Interlock Programs are caused by a driver or other person not completing required services or not using the lockout device’s countdown timer correctly. Other causes of problems with Interlock Programs include a series of minor electrical failures in a vehicle that are reported as “tampering” with the Interlock.
This information provides a general overview of the Mechanics of a Service Visit, the Early Service Appointments that might be forced upon a driver, the Recorded Events that are logged by the device and the general Information regarding the Providers and their Service which would be required by a driver to select the correct Provider to cover their Full Monitoring Term.
What actually happens during a scheduled service visit
A typical service call can take as long as 40 minutes to complete. The following steps are typically carried out during a service call, The handset is first calibrated against a certified reference standard (typically a dry gas cylinder or a wet bath simulator) as specified by the manufacturer. Firmware for the device is then updated as necessary (typically as part of a revision). Finally, the stored event log from the device is downloaded and reported to the monitoring authority. The technician performing the service will also check that the following have not been tampered with, Tamper proof seals on the device; Wiring harness from the device; Camera (if fitted) to the interlock device; Starter circuit relay connection(s) in the vehicle.
Why calibration drift matters more than drivers expect
Service Intervals, It is typical for an interlock program to include a 30 or 60 day service interval for the interlock as well as for the device (e.g. Fuel cell sensor) to be calibrated to read accurately. A device that reads slightly high will result in failed starts at various breath alcohol concentration levels, and a device that reads low will result in a failed start and a corresponding interlock record that will not survive scrutiny.
Service intervals and what pulls an appointment forward
Interlock monitors typically set a Service Interval of 30 or 60 days. During this time the monitor is counting down in the background and warning the driver of an impending lockout in the days leading up to the lockout. It is a Hard & Fast event and you should not attempt to be late for the appointment.
Conditions that warrant contacting the provider before the due date
- A recorded violation or a sequence of failed rolling retests, which some programs treat as an automatic early service trigger
- Any battery replacement, alternator work, or jump start, since power interruptions are logged and may read as circuit tampering
- Physical damage to the handset, cable, or mouthpiece housing
- Repeated inconclusive or aborted tests, which usually indicate a sensor or flow problem rather than driver error
- Planned bodywork or engine work where a shop will disconnect the harness
How recorded events are usually interpreted
Recorded events are read by the monitoring authority in the driver’s absence. Knowing what types of events are recorded as the normal course of use will allow a driver to report events in context as they occur rather than have to explain them weeks later.
| Logged event | Frequent innocent cause | Sensible response |
| Positive breath sample below violation threshold | Mouthwash, breath spray, or fermented food within fifteen minutes | Rinse with water, wait, retest, and note the timing |
| Rolling retest missed | Retest prompt during heavy traffic or a phone call | Pull over safely and complete the retest as soon as prompted |
| Power loss or circuit interruption | Weak battery, corroded terminal, or shop disconnection | Document the repair and notify the provider the same week |
| Repeated aborted samples | Inadequate breath volume or condensation in the mouthpiece | Replace the mouthpiece and request a sensor check |
| Start attempt without a sample | Another driver unfamiliar with the device | Ensure every authorized driver is trained at installation |
Vehicle side conditions that generate most avoidable events
The interlock is always on. The reliability of the interlock depends on the vehicle in which it is installed. For this reason, a weak battery, aftermarket alarm systems, and remote start systems (that start the vehicle without a breath test) can all cause interlock problems and require an explanation to the monitoring authority.
Seasonal and environmental factors
An interlock is a continuous power user and the stability of the interlock is based upon the stability of the vehicle in which it is installed. Thus, a failing battery, a high idle interlock draw from an aftermarket car alarm, or a remote start system that cranks the engine up for a breath test will all generate events that must be explained. The battery condition should be checked prior to installation of the interlock. Drivers in the Inland Empire are best served by choosing among established Redlands ignition interlock services that will test the charging system before fitting the harness.
Selecting a provider and preparing for removal
Not all Redlands ignition interlock services are created equally. Although certified, programs vary with respect to issues including the number and time of scheduled appointments, technician quality and consistency, and timeliness of and accuracy of reporting. A good program includes evening and weekend hours. They should provide mobile service for early appointments caused by lockout related reasons. Finally, all good programs have a single facility where interlock service including installation and removal can be performed.
Questions worth asking before the harness goes in
- How are lockouts handled outside business hours, and what does that call out cost
- How soon after a service visit is data transmitted to the monitoring authority
- Is the wiring returned to factory condition at removal, and is that work warranted
- What documentation is provided at the end of the term for the driver’s own records
Each program will have requirements specific to the jurisdiction in which the driver is licensed as well as specific to the individual’s interlock program. Therefore, the requirements for each program should be checked with the monitoring authority as well as with qualified counsel for the most up-to-date and specific information.
Also Read | What Are the Main Steps in Getting an Ignition Interlock Installed?
