Jensen VX3020 Operating Instructions Manual page 51

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The VX3020 has a built-in SWC Interface compatible with most resistive type OE steering wheel controls. In most installations, only two of the three wires will be needed to
interface the OE steering wheel controls to the VX3020.
SWC A- Primary SWC Wire
SWC 8 -Secondary SWC Wire
SWC Ground - Chassis ground
Initial wiring of the SWC interface should include the SWC A and SWC Ground wire. If this combination of wiring does not support your vehicle functions, then try the SWC 8
and SWC Ground wire combination. Do not use only SWC A and SWC B. The SWC Ground must be connected.
Some vehicles may not support all SWC functions. Professional Installation is recommended.