In early 2023, Tesla launched its FSD Hardware 4.0 – now known as AI4 – an improved version of Hardware 3 with various advantages. This hardware launch initially came off to a rocky start with FSD and Autopilot not being available to freshly delivered vehicles.
Today though, AI4 is the next step as Tesla strides towards full autonomy. While Tesla hasn’t abandoned HW3 or declared it as legacy yet – and doesn’t seem to plan to, it’s still important to be able to figure out what hardware your vehicle has. This is especially true for those who have paid for, or are subscribed to FSD – as it seems that going forward, AI4 will receive major FSD updates before hardware 3, which will require optimization.
So, let’s go over what AI4 offers in terms of improvement, the fact that there is no retrofit path from Hardware 3, and finally, a few easy ways to tell FSD Hardware 3 from Hardware 4/ AI4.
HW4 / AI4 Improvements
AI4 brought along several improvements, including new cameras, new electrical and wiring harnesses, and most of all – improved processing power.
The new cameras bring improved resolution for better details. The rear camera on AI4 has a resolution of 1448x938 vs 1280x960 on Hardware 3. However, there’s a much larger differences in the front cameras. HW4/AI4 has a resolution of 2896x1876 while HW3 has a resolution of 1280x960. That’s a huge improvement in quality - additionally, that telltale red tint that they have ensures better performance in low-light conditions. The video below compares the difference between HW3 vs HW4.
Musk previously said that HW4 is about 3-5x faster than hardware 3, although all of that compute power isn’t being utilized yet. We’ll likely see the full power of HW4 come into play with the divergence of HW4 later this year.
How to Tell If You Have HW3 or HW4 / AI4
There are a few easy ways to tell if you have Hardware 3, or AI4. Sadly, Tesla doesn’t provide any information in the app or vehicle that simply tells you which FSD hardware you have, so here are a few ways to tell them apart.
Note the telltale red glint of the HW4 cameras
Not a Tesla App
Delivery Date
The first is based on your model and delivery date. If you purchased Model S or X, you’ll likely have AI4 if you purchased after March 2023. If you have a Model Y, it’s after late May 2023 for vehicles made in the United States. The updated 2024 Model 3 has HW4, but if you have a 2017-2023 Model 3, you’ll have Hardware 3.
Red Camera Lenses
Next, if you’re not sure of the delivery date of your vehicle, or want to confirm, take a look at the vehicle itself. HW4/AI4 has cameras with red lenses – the easiest place to see this is on the front cameras – where there will be 2 red lenses and one black (fake) lens. AI4 got rid of the 3rd front-facing camera since the cameras now have a higher resolution.
The repeater cameras are also slightly different, with the same red tint, but include a smaller and narrower turn indicator.
HW4 (top) and HW3 (bottom) repeater cameras
Not a Tesla App
No Retrofit to HW4
Elon Musk and Tesla have confirmed that unlike AP 2.5 or AP 2, Tesla does not intend to offer a retrofit for older vehicles. This isn’t a surprising move, especially given the fact that there is an entirely new wiring and cooling harness for the compute unit in AI4.
This, in turn with AI4’s different form factor, means that it isn’t feasible to upgrade HW3 vehicles to AI4. A retrofit would be a complex and expensive task that would likely require building a custom solution that would fit into HW3 vehicles. It also comes with other complications such as overwhelming Tesla Service. Instead, Tesla will continue to do it the software way – by optimizing and updating the FSD models to perform well on Hardware 3.
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Tesla’s upcoming Home Wireless Charging Pad – the so-called “Project Garfield,” will get special Autopark support. Vehicle backup cameras will be able to locate the Wireless Charging Pad and then Autopark the vehicle in the best spot for the charging session to begin.
This information comes from Gizmodo China, who found this information from a reputable local source. We previously looked into Tesla’s Wireless Charging Patents in-depth and how Tesla intends to make this a simple and easy-to-use system, but one that’s also fairly high performance.
Automatic Docking
Similar to your robotic vacuum automatically docking to charge, eventually, your Tesla will be able to automatically locate your Home Wireless Charging Pad, and then maneuver itself into the perfect spot to take advantage of the highest charging speeds with the least energy leakage.
Automatically docking the vehicle is a fantastic solution to the woes of Wireless Charging, where even minor misalignment creates heat and wastes lots of energy. This fixes that issue at the vehicle level, so owners won’t have to move their wireless charging pads under the vehicle or move their vehicle around to find the perfect spot on their own.
In combination with Tesla’s patent to automatically adapt to variations in wireless charging layouts and systems, it seems that Tesla will be able to adapt to most circumstances that previous wireless EV charging companies were having difficulties with. Tesla will be able to vary the coil induction across its Wireless Charging Pad to “steer” or aim the wireless charging at different parts of the inductive coil inside the vehicle, enabling them to reduce heat, reduce waste energy, and accommodate variances in how vehicles line-up with the Wireless Charging Pad.
This feature may be limited to owners or subscribers of Enhanced Autopilot and Full Self-Driving, which come with AutoPark as a standard feature. It could also be a software-level feature that’s enabled when a Home Wireless Charging Pad is detected nearby—which could also be an excellent option. We don’t know how Tesla plans to implement this just yet, but it will be very cool.
While we expect Tesla’s upcoming Robotaxi to feature the first Wireless Charging tech inside an EV, the Cybertruck already has the connectors for it and is ready to be retrofitted with the induction coils in a future update. The upcoming Model Y Juniper may also bring Wireless Charging en-masse to EVs.
We’re super excited to hear more about Tesla’s Home Wireless Charging Pads, as they’ll add even more convenience to owning a Tesla.
Rendering of what Tesla's integration could look like
@dkrasniy
Tesla is adding support for Smart Child Seats in an upcoming update. Greentheonly, who typically decompiles and analyzes Tesla’s software updates, found references to smart car seats in update 2024.32. Tesla will sometimes release code in a software update that isn’t exposed to end users. There could be various reasons for this, such as Tesla wanting to collect data and running the feature in shadow mode, which is often the case with features like Park Assist, Autopark, or Autopilot changes.
Tesla also has the capability to turn on a certain feature in a remote configuration, letting them enable or disable the feature at their discretion. Whatever the case, Tesla appears close to releasing support for these new car seats that help alert parents of potential dangers.
Smart Child Seats
The Smart Child Seat in the preview image is the Babyark Convertible Car Seat, which retails for approximately $1,200 USD. In the code of Tesla’s update, they specifically refer to an “ISOFIX” base. ISOFIX is a standardized car seat fitting system that automatically locks onto a car seat.
The Babyark comes with a slew of smart features, including real-time notifications, buckle alerts, status notifications, and approximately how much time your baby has spent in the seat. Additionally, the Babyark can remind owners of reconfiguring the seat as your child grows. One of the key features of Babyark is a forgotten child alert – which prevents parents from leaving their child in the car.
At this point, we’re not quite sure exactly how many of these smart features will be integrated into Tesla’s UI, but most likely the forgotten child alert will be integrated, as well as possibly a means to automatically recognize when an ISOFIX style seat is installed. Currently, child seats need to be manually marked in the UI – which will dismiss the seatbelt indicator for that seat.
Tesla has time and time again placed a huge focus on safety features, and this upcoming support for smart child seats is another interesting integration to help ensure that parents can keep their children safe. And when they grow up – you can use Tesla’s parental controls to ensure that they drive their Tesla in a safe manner.
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