Owner's Manual

11
SWI Output Troubleshooting
1. The SWI interface programs successfully and appears to be operational but does not control the aftermarket radio. When pressing
buttons on the steering wheel, does the LED flash (indicating it is receiving the command)? If the answer is YES, move on to step 2. If the
answer is NO, it appears that there is an issue with programming (click here for detailed programming information).
2. Is the Radio Selector Dial set to the proper setting for the radio that is being installed?
If the dial is correctly set, it is still recommended to unplug the SWI interface and move the dial away from the correct position and back
to the correct position (to insure it is seating on the appropriate dial position) then plug back in and test to see if the radio responds to
the steering wheel commands. If it is still not responding, move to step 3.
3. Verify that you are using the correct steering wheel control input connection for the brand of radio being used. Also verify that the SWI is
connected into the appropriate radio port for the steering wheel control input (sometimes labeled as W/R input or wired remote in).
Radios will occasionally offer an additional 3.5 mm connector to support an auxiliary input that is mistaken for the steering wheel input
connector. Also make sure that the 3.5 mm connector is fully seated into the back of the radio. In rare occasions it may be necessary to
shave some of the plastic off of the 3.5 mm jack to allow it to seat securely into the back of the radio. Try using your hand to place
pressure on the 3.5 jack into the back of the radio while testing the steering wheel controls. If this clears up the issue, it should be
possible to shave enough of the plastic off the connector to allow it to seat securely into the radio.
4. It is possible to test the output of the SWI interface using a multimeter. Place one lead of the multimeter to either
the Blue/Yellow wire (shown in photo above) while not connected to the radio or to the tip of the 3.5 mm jack
(shown in photo to right) and the other meter lead to ground. What you will test for is determined by what the
radio selector dial is set to:
Dial Setting 1, 2, 3, 4 = DC voltage pulses (Serial Data)
Dial Setting 5, 6, 7, 8, 9 = Variable resistance
As you press steering wheel buttons, the LED on the SWI should flash. The LED flashing indicates that it should be
outputting, use the information from above to check with meter for appropriate output. If testing shows there is
no output on the appropriate radio connector, check meter leads and verify meter’s connection to ground. If
testing still yields no output and the correct programming procedure has been followed, replace SWI. If the testing shows that you are
receiving the appropriate output (DC voltage pulses for dial settings of 1, 2, 3 and 4 or variable resistance for dial settings of 5, 6, 7, 8 and
9), proceed to step 5.
Radio dial must be set to the appropriate
number that corresponds to the type of radio
prior to connecting the harness to the interface.
Additional radios may support the SWI-RC, but
have not been tested. Click here for additional
information.
The aftermarket radio will either support the
Blue/Yellow steering wheel input or the 3.5 mm
jack (not both). Tape off the unused connection
to prevent output issues. Most commonly, the
Blue/Yellow wire is used for Kenwood and most
newer JVC model radios, but may also be used for
some model radios with 3 separate steering
wheel control input wires (click here for
additional information).