Toyota HYQ14 Smart Keys: FBA, FBX, ACX, AAB, ADR — Boards Explained

HYQ14 is the FCC ID prefix on Toyota and Lexus proximity smart keys from about 2005 onward, and the three letters after it name the generation. HYQ14AAB, HYQ14AEM and HYQ14ACX are the 2005–2015 4D-chip keys (boards 0140, 3370, 6601, 5290); HYQ14ADR is the 2011–2020 Sienna 6-button (board 5691); HYQ14FBA is the 2012–2020 8A-chip key (G board 0020, AG board 2110); HYQ14FBC and HYQ14FLA are the 2019–2022 8A keys on board 0351; HYQ14FBX is the 2022+ 8A key on board 3041; and HYQ14FBN and HYQ14FBW are the 2019+ Corolla and Camry keys on a 4A (HITAG AES) chip. On Toyota, the board number printed inside the fob decides fitment more than the FCC ID does, so always match both.

Why the board number matters more than the FCC ID

Toyota reused each FCC ID across several circuit boards, and the boards are not interchangeable. Two 4-button HYQ14FBA keys can be a G 0020 board (Camry, RAV4) or an AG 2110 board (Highlander), and the wrong one will pair to the door but never start the car. The board number is printed on the PCB and usually on the product listing. The same applies to the older HYQ14AAB, which shipped on 0140 and 3370 boards, and to HYQ14FBC and HYQ14FLA, which both sit on 0351.

The chip generation follows the same split and decides which programming route and which universal boards apply:

For chip background see the transponder chip ID guide.

HYQ14 codes stocked, by generation

4D generation: HYQ14AAB, HYQ14AEM, HYQ14ACX, HYQ14ADR (2005–2020)

All are 4-button, 315 MHz unless noted, and all aftermarket.

8A generation: HYQ14FBA, HYQ14FBB, HYQ14FBC, HYQ14FLA (2012–2022)

HYQ14FLA is listed as a cross-reference on the aftermarket HYQ14FBC 0351 rows, which is consistent with the two codes sharing a board. Verify against the vehicle before substituting.

Newest 8A and 4A keys: HYQ14FBX, HYQ14FLC, HYQ14FBN, HYQ14FBW (2019–2025)

HYQ14AHK and HYQ14AHC carry the same prefix but are Subaru keys (2014–2022, 8A / RF430 on AHK); they are covered in the Subaru guide.

Lonsdor LT20 boards that cover the same vehicles

The Lonsdor LT20 series is a set of Toyota/Lexus smart-key PCBs with adjustable frequency that drop into an aftermarket shell. They are generated with the Lonsdor KW100 (also sold as a KW100-S kit with two LT20 boards) or a Lonsdor K518 series tool. The catalog maps them as follows:

For the 4A-chip Corolla and Camry keys (HYQ14FBN, HYQ14FBW), the catalog lists a separate Lonsdor LT30-02 4A board for select 2022–2024 Toyota. Xhorse's XM38-generation Toyota smart keys (XSTO01EN, XSTO03EN) are the VVDI-tool equivalent; see the Lonsdor universal smart keys guide and Xhorse universal remotes guide for which tool each needs.

What Car Key Source stocks

Every HYQ14 key and LT20 board above is a published product. In-stock orders placed by 4 PM ET (Mon–Fri) leave the warehouse the same business day. US orders ship from our Florida warehouse; Canadian orders ship from Ontario — nothing crosses the border, so there is no customs, duty or brokerage for the buyer. If a key or remote won't program on the vehicle we listed it against, it is refunded within 30 days of delivery and we pay the return freight. Browse by model on the Toyota, Lexus, RAV4, Camry and Highlander pages, or start from /fcc/hyq14fba. Programming routes are in Toyota key fob programming.

FAQ

Are HYQ14FBA and HYQ14FBC interchangeable?

No. HYQ14FBA sits on the 0020 or 2110 board (2012–2020) and HYQ14FBC on the 0351 board (2019–2023). Same 8A chip family, different boards, and a board mismatch will not start the car.

What does the board number on a Toyota smart key mean?

It identifies the circuit board revision inside the fob (0140, 3370, 0020, 2110, 0351, 3041 and so on). Toyota reused FCC IDs across boards, so the board number is the true fitment key on these vehicles.

Which HYQ14 keys use a 4D chip and which use 8A?

Per the catalog, HYQ14AAB, AEM, ACX and ADR are 4D (2005–2020), while FBA, FBB, FBC, FLA, FBX and FLC are 8A (2012–2025). HYQ14FBN and FBW on the 2019+ Corolla and Camry are 4A.

Can one Lonsdor LT20 board replace all HYQ14 keys?

No, but a small set covers most of them: LT20-03 for the 4D era, LT20-10-4/-5/-6 for the 8A and BA generation, LT20-05 and LT20-06-5 for the 6- and 5-button vans, and LT20-07 for 2017–2020 Lexus. The 4A Corolla and Camry keys need the LT30-02 board.

Is a 3-button and a 4-button HYQ14FBX the same board?

Both are listed on board 3041 with an 8A chip, but the button layouts differ (Prius 3-button versus Tundra 4-button and bZ4X 5-button). Match the button count to the customer's fob.