Mercedes S-Class 6th (W222) (2014–2021) — Key Programming Reference
- Difficulty
- expert
- Lishi / lockout
- HU64
Key fobs & transponder keys (3 variants)
| Key | Years | FCC ID | P/N | Chip | Freq | Battery | Blade |
|---|---|---|---|---|---|---|---|
| 315 MHz · IYZDC12K | 2014–2017 NA | IYZDC12K | A2059053716 | BGA transponder (Mercedes FBS4) | 315 MHz | CR2025 | HU64 |
| 315 MHz · IYZ-MS1 | 2018–2021 NA | IYZMS1 | A2229059604 | BGA transponder (Mercedes FBS4) | 315 MHz | CR2032 | HU64 |
| 433.92 MHz · A2229059610 | 2014–2021 (Europe, Asia-Pacific, GCC) | n/a | A2229059610 | FBS4 | 433.92 MHz | CR2032 | HU64 |
Programming procedures
What the job needs
- Add a key: 1 existing working key required.
- All keys lost: no existing working key needed.
- PIN / security code: required — NASTF + IMKPA + dealer.
- Online / server access: required — Mercedes cloud token.
- On-board (no tool) sequence: not available — Mercedes S-Class Mercedes FBS4 BGA requires professional tool + EIS bench dump — no self-programming.
- On site: engine off · 12V+ battery support · Clear EIS DTCs.
- Bring: Photo ID + vehicle registration. VIN cross-check before start.
Tool coverage
Documented for this case on: Autel IM608 Pro II · Autel IM508S · Autel KM100 · Xhorse Key Tool Plus · Xhorse Key Tool Max Pro · Lonsdor K518 Pro / K519 · OBDSTAR X300 DP Plus · AutoProPad G2/G3 · Advanced Diagnostics Smart Pro · Launch X431 IMMO Elite / IMMO Plus. Step-by-step menu paths for each tool are in the app.
Notes & cautions
- This chassis Mercedes S-Class uses Mercedes FBS4 BGA transponder (2014-2021). FBS4 covered by Autel IM608 Pro II + IMKPA Mercedes + XP400 PRO for EIS bench (mandatory on AKL), Xhorse VVDI MB Tool + MB tokens (~$30-50/car), AVDI Mercedes. Password cloud calc via Autel IMKPA / VVDI cloud.
- Mercedes EIS is fragile — battery support 12V+ MANDATORY; EIS lockout if voltage drops mid-read.
- Mercedes BGA smart key: ensure existing key fob battery is functional before starting.
- Verify chip before booking (this chassis facelift): Mercedes FBS4 BGA replaced FBS3 NEC on 2014+ facelifts. Some 2014-2016 W205/W222/X253 shipped with mid-cycle EIS swap — confirm transponder ID and EIS version from a working key with Xhorse VVDI MB Tool reader before quoting.
- Tool kit context: Autel XP400 PRO is MANDATORY for EIS bench dump on most Mercedes FBS4 AKL jobs. Autel IMKPA Mercedes cloud token + Xhorse VVDI MB Tool tokens (~$30-50/car) for password calc. APB112 simulator NOT applicable. G-Box bench is BMW-specific. LKE Smart Key Emulator unused.
- All existing keys erased. Bring ALL replacement BGA keys before starting — minimum 2.
- No manual AKL for Mercedes S-Class Mercedes FBS4 BGA — professional tool mandatory + EIS bench dump.
- AKL via OBD rarely works on FBS4 — plan EIS removal + bench EEPROM (XP400 PRO / VVDI MB Tool) and 90-120 min job time.
- Keep all existing/lost key fobs at least 10 metres from vehicle during AKL.
- AKL accessory needs: Autel XP400 PRO + IMKPA Mercedes token + EIS bench dump CRITICAL on FBS4. Xhorse VVDI MB Tool + MB tokens alternative path. APB112 simulator NOT applicable. G-Box bench NOT used on Mercedes. LKE Smart Key Emulator unused.
Lockout
Door pick / decode: Lishi HU64 (CW).
48 verified sources · Last verified: 2026-08-10
Open full case in KeyAssist →Step-by-step tool menu paths, verified source links and video guides for this case are in the KeyAssist app — free to start, works offline.