801 901 Installation Instructions
Mercedes-Benz FBS4 Key Addition Adapter – Installation Instructions (901)
Compatibility:
Designed for Mercedes-Benz FBS4 vehicles equipped with the original grenade-style key, factory push-button start, and Keyless-Go door handle sensors.
Installation:
Installation is simple. Just plug the adapter directly into the vehicle's original Keyless-Go control module. No additional wiring is required.
Important Note:
If the customer wants to retain the original key-insertion starting function, the ignition lock must be removed and a special circuit board installed inside. The optional 901P installation kit is required.
Supported Models (2012–2018):
C-Class, GLC, S-Class, ML, GL, GLE, GLS, GLA, CLA, CLS, SLC, G-Class, E-Class, A-Class, B-Class.
Key Features:
Supports original Keyless-Go door handle sensors.
No need to disassemble the original key.
Plug-and-play installation.
No additional wiring required.
Note: Compatibility depends on the vehicle's specific configuration.
Important Installation Notes
The original remote key must be fitted with the dummy battery and placed inside the main control box.
Place the remote key with the buttons facing up and the infrared transmitter pointing toward the white connector.
Important: No adjustment is required for GLC, C-Class, and S-Class models. For all other models using the older grenade-style key, immediately disconnect the power from the main control box and set DIP switch No. 3 to OFF (down position). Otherwise, the remote control will not work!
Make sure the main power connector is fully inserted. A loose connection may cause various malfunctions!
