Installation Instructions

Considerations
If you will be installing the FM Direct Adapter (also known as a FM Relay Switch or FM Switch Box),
it will directly connect the FM signal from your SIRIUS radio to your vehicle’s AM/FM radio, reduc-
ing any interference which might be present from FM radio station broadcasts. When the SIRIUS
radio is turned off, the vehicle’s FM antenna is automatically connected back to the vehicle’s AM/FM
radio. The adapter connects directly in-line with the vehicle’s existing AM/FM antenna input.
If you will not be installing the FM Direct Adapter, the FM Out Plug must remain installed in the
S50 vehicle dock to ensure that your S50 radio operates properly and does not interfere with other
radios.
SIRIUS suggests professional installation of the FM Direct Adapter in your vehicle. Ask your SIRIUS
retailer if they provide professional installation services, or can recommend a professional installa-
tion service.
Certain vehicle models will require adapters to connect the vehicle’s AM/FM antenna to the FM
Direct Adapter, and to connect the FM Direct Adapter to the vehicle’s AM/FM radio. Your SIRIUS
retailer may sell these adapters, or a professional installer may be able to provide them.
Installation
Figure 1 shows an overall diagram of the FM Direct Adapter installation with your vehicle’s AM/FM
radio and your SIRIUS S50 radio.
FM DIRECT ADAPTER
VEHICLE AM/FM
ANTENNA
VEHICLE AM/FM RADIO
SIRIUS S50 RADIO
& VEHICLE DOCK
FROM VEHICLE
AM/FM ANTENNA
TO S50 VEHICLE DOCK
TO VEHICLE
AM/FM RADIO
Figure 1Figure 1
To install the FM Direct Adapter in your vehicle follow these steps:
Consult a professional installer to assist you in removing the FM Out Plug from the FM OUT
connection at the rear of S50 vehicle dock. (Figure 2) Retain the FM Out Plug and reinstall it if
the FM Direct Adapter is ever disconnected from the S50 vehicle dock.
FM OUT LINE OUTDC 5V ANT
Remove the vehicle’s AM/FM radio from the dash and disconnect the vehicle’s AM/FM an-
tenna cable from the rear of the radio.
Refer to Figure 3 and plug the FM antenna cable from the FM Direct Adapter into the same
connector on vehicle’s AM/FM radio. (An additional adapter may be required.)
1.
2.
3.
Figure 2Figure 2
2 3 4