Firstech, LLC. FT-MBKG20-HRN User Manual
Data Controller (DC)
Remote Start for Mercedes
www.compustar.com
888.820.3690
KeylessGo
FT-MBKG20-HRN Installation Guide
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.
Required Parts and Tools
T-20 Torx Driver•
Pick Tool•
Panel Removal Tool•
Digital Multimeter•
10K Ohm Resistor•
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.Inserta10kΩohmresistorbetweenthebrownandbrown/redwiresintheconnector.
8. Using your meter, measure the resistance between the two wires on each plug at the CAN block
thatwereunpluggedinstep2untilyoufindtheplugthatreads10kΩohmacrossthetwowires.
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.
Copyright 2010 Firstech, LLC. | 1
Data Controller (DC)
Remote Start for Mercedes
www.compustar.com
888.820.3690
KeylessGo
FT-MBKG20-HRN Installation Guide
12. Close the retaining clip and put the empty connector housing back into the CAN block. (See
images below)
13. Insert the pins into the provided plug housing making sure the polarity is correct with the
extension harness coming from the DC control module.
Brown/Red--->Brown/Red•
Brown--->Brown•
14. Close the retaining clip on the new connector.
15. Plug the connector into the harness from the DC control module.
Please see the step by step images below for details on the KeylessGo connection:
Module Location Table
Class Year CAN Block KeylessGo Module
C 2008-2010
CL, S 2007-2010
E coupe/sedan 2010
GL 2006-2010
GLK 2010
Passenger front door
jamb in wire trough
Under rear of driver’s
front seat
Passenger front door
jamb in wire trough
Right side compartment
in cargo area
Passenger front door
jamb in wire trough
Right side of trunk near
tail light
Right side of trunk near
tail light
Right side of trunk near
tail light
Right side compartment
in cargo area
Center of cargo floor
under carpet
ML, R* 2006-2010
Passenger front kick
panel*
Right side compartment
in cargo area*
*ML and R class do not require to change connector plug (steps 10-14 not required). Just plug in
to the extension harness once the correct connector is found in the block.
Copyright 2010 Firstech, LLC. | 2
Data Controller (DC)
Remote Start for Mercedes
KeylessGo
KeylessGo Component Locations
C and E Class module locations.
KeylessGo plug
on module in
trunk
C and E Class
www.compustar.com
888.820.3690
FT-MBKG20-HRN Installation Guide
KeylessGo Module
Plug removed - faces body of car
E coupe KeylessGo module -- right rear of trunk C and E Sedan KeylessGo module -- right rear trunk
CAN connector, E, C, GLK class under plastic
passenger front door
Copyright 2010 Firstech, LLC. | 3
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