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SWC Questions
If this unit is only compatible with anaologue SWC systems, how do I
tell if the vehicle has an analogue or digital system?
Test 1 - Without the radio SWC wires connected.
With an Ohm meter, probe the SWC positive and SWC negative connection on the
vehicle. Press and hold a button on the steering wheel. If the resistance reading
changes from an open circuit to a steady resistance reading, the SWC system
is analogue. If however the reading changes from an open circuit to a pulsing or
constantly changing reading while the button is held down rmly, the SWC system
is digital. If your vehicle has more than one SWC positive connection, only half of
the buttons on the steering wheel will be connected to each wire, in which case,
you may have to try a few dierent buttons before you get a reading.
Test 2 - With the radio SWC wires connected.
With a volt meter, probe the SWC positive and SWC negative connection, while
the radio is on. Press and hold a button on the steering wheel. If the voltage
reading drops from 3.3 volts to a lower voltage and remains at that voltage as long
as the button is held down, the SWC system is analogue. If the voltage reading
starts jumping up and down while the button is held down rmly, the SWC system
is digital. If your vehicle has more than one SWC positive connection, only half of
the buttons on the steering wheel will be connected to each wire, in which case,
you may have to try a few dierent buttons before you get a reading.
What can I do if the vehicle has a digital SWC system?
A CANBUS SWC adaptor will be required to convert the digital signals to
analogue signals.
What if the vehicle does not have any SWC functions or the SWC function is
not needed?
Insulate the key wires.
The SWC wires are connected, but when a button is pushed during the
programming procedure, there is no response from the radio screen.
The vehicle likely uses a digital SWC system, a SWC adaptor will be required.
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