When a vehicle's interlock screen stays unchanged longer than usual on a winter morning, the driver and the fleet manager find it hard to judge whether to delay departure or whether the device needs checking. An interlock is a device installed in a vehicle to control engine starting based on the breath test result the driver provides through the handset. The AF-i1 consists of a handset that measures breath, a control box connected to the vehicle, and dedicated software that manages usage data.
A warm-up screen here does not immediately mean an error, and having waited a long time does not by itself establish a fault. Conversely, even if wording that reads like an error or warning appears on the screen, you must not apply the meaning of another model's codes. In winter, on the premise that temperature and previous readings can affect warm-up time, you need to separate waiting from items that need checking, based on the exact wording on the current screen and the model-specific instructions.
Conditions that can lengthen warm-up time
The official AF-i1 product information gives a warm-up time of about 1 second at 25℃, about 120 seconds at -20℃, and about 180 seconds at -40℃. It also states that this time can vary depending on the previous reading. A longer-than-usual warm-up stage at low temperatures is, in itself, within the scope of the product information.
However, it is a problem to interpret these figures as time limits you can use on site. The temperature outside the vehicle and the temperature inside the vehicle where the handset sits can differ, and you may not know what temperature the device was actually at. It is also better not to treat a departure after indoor parking and a vehicle left outdoors overnight as the same condition.
Record the exact screen wording before the time
When a warm-up screen is showing, the priority is to check the wording that first appeared after power-on and the current wording exactly as they are, rather than judging that "so many minutes have passed." The exact distinction between wording that indicates a warm-up state and wording that indicates an error or warning should be confirmed through that model's user manual or the installation and support channel. The specific screen wording and display sequence of the AF-i1 cannot be confirmed from the product information provided.
When the warm-up screen lasts longer than usual, the effect of low temperature or the previous reading cannot be ruled out. But if error or warning wording is displayed, or the meaning of the screen is unclear, do not treat it as simple waiting time; separate the wording itself as something to check. This is why warm-up and error screens are distinguished not by time alone, but by whether the display is one defined in the model-specific instructions.
| Situation observed | What to judge first | Information to keep |
|---|---|---|
| Warm-up screen shows longer than usual | Possible effect of low temperature and previous reading | Parking location, first wording seen, time of power-on |
| Wording that looks like an error or warning appears | A situation where its meaning should be checked in the model's instructions | Exact screen wording, model name, time it occurred |
| The same screen keeps appearing and its meaning is unclear | Hard to say whether it is normal or an error from current information | Photo or note of the screen, whether it repeats, actions already taken |
| Several drivers use the vehicle in turn | Risk of mistaking the previous driver's screen status for a result | Screen shown at handover and whether it was checked |
Order of judgment in a hypothetical outdoor parking case
As a hypothetical case, consider a vehicle left outdoors overnight in which the warm-up screen shows longer than usual after the AF-i1 is powered on. What to observe here is not just the feeling that it is very cold. Record whether the vehicle was outdoors, when it was powered on, and what the first and current screen wording are. If the actual temperature was not measured, do not record an estimated temperature as if it were fact.
If only a screen that appears to be a warm-up state shows, with no wording confirmed as an error or warning, you can first consider the possibility that warm-up time lengthened under cold conditions. Conversely, if particular wording is defined in the manual as an error or as a display requiring separate action, or if its meaning cannot be confirmed, it is better not to guess the cause on site. Depending on what you observe, possible actions include telling the person in charge of the trip schedule that the device status is still being checked, and considering approved alternative transport or a schedule adjustment.
In this case, the completion criterion is not an arbitrarily set waiting time. The criterion is a state where the meaning of the current screen has been confirmed through the model-specific instructions, or wording that is hard to interpret has been passed to the installation and support channel and the next course of action has been set. It is best to avoid heating the handset with an improvised heat source, touching the vehicle wiring and connections, or repeatedly switching the power to try to change the screen.
What to pass on for a support check
An explanation like "it doesn't work because it's winter" makes it hard to tell a warm-up delay from an error display. Organizing whether the vehicle was indoors or outdoors, when it was powered on, the wording on the screen, whether the wording changed, and what actions have already been taken narrows down what needs checking. If you can take a photo of the screen, it also reduces mistakes in copying the wording.
The AF-i1 can store vehicle ACC, engine start, test results, and tampering-related events with date and time information, and logs can be managed and downloaded with dedicated software. A fleet manager can set an operating standard for reviewing the screen notes from the time together with stored usage events when a situation recurs. However, the product information provided does not state that the display history of the warm-up screen is stored in the log, so you should not assume the log alone can confirm the order of screen transitions.
Reducing confusion in shared vehicles
When family members or shift drivers use the same vehicle, the next person may take over the vehicle without knowing about the warm-up screen the previous person saw or wording that needs checking. When handing over a vehicle, it is more practical to share specifically the wording currently shown, the time of power-on, and whether support has been contacted, rather than stating only a conclusion such as "there's a problem with the device."
A fleet manager can build time for checking warm-up status into winter departure schedules and set a simple standard for recording screen wording. The standard is to look at temperature conditions together when warm-up time runs long, and to refer wording confirmed as an error, or displays whose meaning is unknown, to the model-specific instructions. Separating things this way lets you avoid hastily calling a long warm-up a fault while not missing screens that actually need checking.
