Firstech FT-MBKG20-HRN Installation Manual

Data Controller (DC)
Remote Start for Mercedes
KeylessGo
Welcome to the installation guide for the KeylessGo portion of the remote start for Mercedes. Please
thoroughly review this manual before installation as there are details that are essential to operation of
the vehicle.
This manual is intended for experienced installers. Firstech recommends professional installation as
we are not responsible for improper use and/or installation. For questions please call 888-820-3690
Monday through Friday 8 am to 5 pm PST.
Mercedes Benz vehicles that have a push button for starting will require the KeylessGo harness. (Part
number: FT-MBKG20-HRN) This will let the user lock and unlock their vehicle from DroneMobile, 2
or 1 Way remote or factory key fob during remote start. This harness must be ran to the KeylessGo
module to a separate CAN connector in the vehicle. The other end of the harness plugs into the 2
pin KeylessGo port on the DC for Mercedes control module.
Note: You must install the DC control module and DroneMobile or RF kit before connecting the
KeylessGo harness. Also don't forget to test functionality of the remote start.
Instructions
1. Locate the CAN distribution block that houses the KeylessGo connector. (See table below)
2. Unplug all connectors from the block that contain brown and brown/red twisted CAN wires.
3. Locate the KeylessGo module. (See table below)
4. Unplug the KeylessGo module.
5. Unclip and remove the connector cover from the KeylessGo connector.
6. Locate the twisted brown and brown/red CAN wires in the plug.
7. Insert a 10kΩ ohm resistor between the brown and brown/red wires in the connector.
8. Using your meter, measure the resistance between the two wires on each plug at the CAN block
that were unplugged in step 2 until you find the plug that reads 10kΩ ohm across the two wires.
9. Plug all the other connectors back into the CAN block except for the KeylessGo connector that you
located in step 8.
10. Using a pick tool or small flat blade, open the retaining clip that holds the connecting terminals
on the side of the connector housing.
11. Using a pick tool or small flat blade release the tabs on each pin and remove them from the
connector housing. The release tab will need to be pressed down two separate times to remove it
from the connector housing.
Required Parts and Tools
• T-20 Torx Driver
• Pick Tool
• Panel Removal Tool
• Digital Multimeter
• 10K Ohm Resistor
FT-MBKG20-HRN Installation Guide
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