NAV-TV’s OPTI-1 is a radio replacement module for compatible Mercedes Benz vehicles equipped with an exter-
nal M.O.S.T. fiber optic amplifier. The module allows the factory amplifier, speakers and sound quality to be
retained when adding a modern aftermarket radio. Other components in the factory system, such as a CD
changer, satellite radio, telephone module, DVD player, or any other factory component in the M.O.S.T loop, will
not function after the installation.
Agreement: End user agrees to use this product in compliance with all State and Federal laws. NAV-TV Corp.
would not be held liable for misuse of its product. If you do not agree, please discontinue use immediately
and return product to place of purchase. This product is intended for off-road use and passenger entertain-
ment only.
Overview
OPTI-1 Electrical Connections
1a. Factory radio plug from
a CLS, E and SLK
1b. Factory radio plug from
a CL, S and SL
1c. Fiber optic cable removed
from the factory radio plug
1d. Optics installed in the
provided outer coupler
Compatibilty and how to verify compatible vehicles
The OPTI-1 has been extensively tested and validated to work with the following model and year vehicles with a
M.O.S.T amplifier:
2005-2008 CLS, 2003-2008 E, 2004-2006 S, 2004-2006 CL, 2005-2008 SL &2005-2008 SLK
To confirm compatibility, remove the radio. With a CD playing in the radio, NOT in an external changer, remove
the M.O.S.T fiber optic cable from the radio harness (pictures 1a-1c below). If all sound goes away completely and
the vehicle model and year is listed above, the vehicle is compatible with the OPTI-1. It is important to properly
validate the vehicle prior to installation, especially in SLK vehicles. It is very rare to have an incompatible vehicle
on any other platform than the SLK.
This is D2B and not MOST. This not compatible.
If you find this connector, the year or model of the
vehicle does not match the verified and compatible
vehicles listed above. Notice the red and white ends?
This is M.O.S.T. Notice no red and white ends.
D2B
M.O.S.T
1. Remove the COMAND radio
2. Disconnect the power harness from the back of the COMAND and remove the optic cable inner plug by gently
prying the retaining clip back with a pick tool (see pictures 1a, 1b and 1c below)
3. Insert the optic cable inner plug into the provided M.O.S.T. outer coupler (see picture 1d below) and plug the
completed new assembly into the fiber optic input of the OPTI-1.
4. Connect the black wire of the OPTI-1 power harness to the ground (brown) wire at the factory radio harness.
This wire cannot be used for a radio ground but is sufficient for the OPTI-1.
5. Connect the red wire of the OPTI-1 power harness to the constant power (usually red with a stripe) wire at the
factory radio harness. This wire cannot be used for the radio constant power feed but is sufficient for the OPTI-1.
6. Connect the blue wire of the OPTI-1 to the amplifier turn on wire of the aftermarket deck (usually blue/white).
7. Connect a full-range RCA output from the aftermarket deck and connect it to the RCA inputs of the OPTI-1.
Note: A short RCA cable is sometimes needed in order to position the OPTI-1 in a location that does not hinder
the depth of the radio opening.
8. Plug the OPTI-1 power harness into the unit and proceed to the next section “Radio & antenna connections”
