901 Terminator Mercedes-Benz FBS4 Key Adapter Box for 2012–2018 C-Class, GLC, S-Class, ML, GL, GLE, GLS, GLA,
901 Mercedes-Benz FBS4 Key Addition SolutionFor 2012-2018 Mercedes-Benz models with grenade-style smart keys. Supports original Keyless-Go, door handle sensing, and plug-and-play installation.✔ Original Key Retained✔ Custom Key Styles Available✔ Add Up to 3 Smart Keys✔ No Wiring Modification RequiredKey Addition Only – All Keys Lost Not Supported.
Product Description
The 901 Terminator Series is specially designed for Mercedes-Benz FBS4 (4th Generation Immobilizer System) vehicles equipped with original Keyless-Go, door handle sensor functions, and grenade-style smart keys.Installation is simple and fully plug-and-play. The module connects directly to the original KG module without cutting wires or making any modifications to the vehicle’s wiring system.Features✔ Supports Original Door Handle Sensor Function✔ Supports Original Keyless-Go Push Start System✔ No Need to Disassemble the Original Key✔ Plug-and-Play Installation✔ No Vehicle Wiring Modifications Required✔ Customizable Key Style Options✔ Supports Adding Up to 3 Smart Keys✔ Retains Original Comfort Access FunctionsPlease select the correct solution according to your vehicle configuration.
| Solution |
Key Type |
Vehicle Year |
Push Start |
Door Handle Touch |
Application |
| FBS4 801 |
Old-style Smart Key |
2012-2018 |
✅ |
❌ |
Smart Key + Push Start without |
| FBS4 901 |
Old-style Smart Key |
2012-2018 |
✅ |
✅ |
Smart Key + Push Start + Touch |
| FBS4 802 |
Flat Smart Key |
2015-2023 |
✅ |
❌ |
Flat Key + Push Start without Touch |
| FBS4 902 |
Flat Smart Key |
2015-2023 |
✅ |
✅ |
Flat Key + Push Start + Touch Handle |
| FBS4 803 |
3-Screw Flat Smart Key |
2019+ |
✅ |
❌ |
New Generation FBS4 / MBUX |
| FBS4 903 |
3-Screw Flat Smart Key |
2019+ |
✅ |
✅ |
New Generation FBS4 / MBUX + |
Supported ModelsSuitable for 2012-2018 Mercedes-Benz FBS4 vehicles, including:• C-Class• GLC• S-Class• ML• GL• GLE• GLS• GLA• CLA• CLS• SLC• G-Class• A-Class• B-ClassFunction DescriptionThis system is designed for adding smart keys to Mercedes-Benz FBS4 vehicles while keeping the original key fully operational.Customers can choose their preferred key style, and the system supports adding up to 3 additional smart keys.After installation, all factory functions remain available, including Comfort Access, door handle sensing, keyless entry, and push-button start.For customers who wish to retain both push-button start and key-in ignition functions, the optional 901P kit and lock cylinder adapter plate are required.Important Notes• Supports key addition only.• Does NOT support all keys lost situations.• At least one working original key is required before installation.AdvantagesFast plug-and-play installation with no need to disassemble the original key or modify vehicle wiring. Maintains factory Comfort Access and Keyless-Go functions while providing a reliable and professional solution for adding smart keys to 2012-2018 Mercedes-Benz FBS4 vehicles.
