Axis AX1770NAV - Page 34

34
SWC Wiring
• Key A and Key B - SWC positive
• Key GND - SWC negative/SWC ground
To enable SWC control, prior to programming SWC functions, the key
wires need to be connected to the vehicle’s SWC connections (see vehicle
manual for information on vehicle SWC location and functions).
1. Connect Key GND to SWC negative connection.
2. Connect Key A and Key B to SWC positive connections.
If the vehicle only has one SWC connection, connect only one Key wire
(either A or B) and insulate the other Key wire.
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
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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,
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OR
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 5 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
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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
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function is not being used, please insulate wires.
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programmed.