2014–2018 Mazda3 Infotainment (BM/BN)
The 2014 Mazda3 was the launch car for Gen 6 MZD Connect. The NXP i.MX6 CMU, the 7-inch touchscreen, and the rotary Commander knob all debuted here, then spread to the CX-5, Mazda6, CX-3, CX-9, and ND MX-5 over the following years. Anything true of the platform generally (boot behavior, firmware mechanics, troubleshooting) is covered once in the Mazda Connect knowledge base; this page covers what’s specific to the BM (2014–2016) and BN (2017–2018).
Being first cuts both ways: the Mazda3 got the platform’s longest North American run, and the earliest cars shipped its roughest firmware.
One screen for the whole run
Section titled “One screen for the whole run”Every BM/BN uses the same 7-inch, 800×480 display, mounted high on the dash and driven by the Commander knob between the seats. The panel is resistive touch: it responds to pressure rather than capacitance, so it works with gloves but feels less sensitive than a phone. Touch is enabled only at a standstill; above a few mph the system goes knob-only by design (reversible on v74).
Unlike the 2019–2020 CX-5, the Mazda3 never got the 8.8-inch non-touch widescreen. There is no larger-screen option at any trim. The hardware is identical from a 2014 base GX to a 2018 Grand Touring, which also means every BM/BN screen carries the digitizer that can fail into ghost touch.
Trims change audio and nav, not the computer
Section titled “Trims change audio and nav, not the computer”| Feature | Sport / GX | Touring / GS | Grand Touring / GT |
|---|---|---|---|
| MZD Connect (7” + Commander) | Yes | Yes | Yes |
| Navigation SD slot | Present, card not included | Varies by package | Card included |
| Bose audio | No | No | Yes |
| Head-up display | No | No | Sedan only |
Every trim ships the same CMU; what varies is what’s plugged into it. Navigation is a software feature unlocked by the SD card. The slot is physically present on all units but often unpopulated, so a base car can add factory nav by buying the card. Map updates and troubleshooting: navigation SD card. Bose cars add a 9-speaker system with an external amp; its quirks are platform-wide and covered on Bose audio.
CarPlay is a retrofit on every BM/BN
Section titled “CarPlay is a retrofit on every BM/BN”No 2014–2018 Mazda3 left the factory with CarPlay. Mazda added it to Gen 6 with a dealer retrofit announced in late 2018: firmware v70.00.021A or later plus a USB hub (part TK78-66-9U0C, sold as genuine accessory kit 00008FZ34) that replaces the single charge-and-storage port in the console. Both pieces are required. The most common failed-retrofit report is a hub installed on firmware below v70, and on the Mazda3 specifically the v70.00.100+ builds fix early CarPlay stability problems, including a bug that played CarPlay audio through one speaker.
A small number of late 2018s got the kit installed at the dealer before delivery under Mazda’s November 2018 accessory program, so check the firmware before buying parts. Budget $70–150 for an aftermarket hub or $150–200 for the genuine kit, plus $200–400 in dealer labor if you don’t do the 30–60 minute install yourself. Mazda3 CarPlay covers the Mazda3 specifics; CarPlay retrofit is the full platform-wide install guide.
Factory firmware ran v29 to v59; every car reaches v74
Section titled “Factory firmware ran v29 to v59; every car reaches v74”- 2014–2015 (early BM) shipped in the v29–v56 range and is the slowest to boot and the buggiest stock. These cars benefit most from getting current.
- 2016 (late BM) typically shipped on v59.
- 2017–2018 (BN facelift) also shipped on v59. The BN is a cosmetic and trim refresh; the CMU did not change, and firmware is fully interchangeable between BM and BN. Region code (NA / EU / ADR), not model year, is what differentiates the
.upfiles.
Every BM/BN can be brought to v74.00.324A, the final Gen 6 build, with no hardware barrier. One catch for the earliest cars: launch-era firmware (v29.xx–v33.xx) can’t jump straight to v74 and needs an intermediate stop at v55+ first. Pull the navigation SD card before any update; leaving it in risks corrupting the nav database. Upgrade path: Mazda3 firmware compatibility and how to get to v74.
The common complaints are platform-wide, not Mazda3-specific
Section titled “The common complaints are platform-wide, not Mazda3-specific”Ghost touch on this generation is the platform’s touch-panel digitizer failure, not anything Mazda3-specific; symptoms and the fix are in Mazda3 ghost touch. Slow boot, CarPlay drops, and the disclaimer screen are also platform behaviors; see common problems. Random reboots and Bluetooth dropouts usually trace to a weak battery or low system voltage before they trace to firmware; that and the rest of the BM/BN complaint list are on Mazda3 common complaints.
Once on v74, the usual quality-of-life changes (disclaimer screen off, touchscreen while driving, faster boot, beeps off) are what most owners ask about. ScreenTune bundles those into one install.