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You would have to look at a schematic but if it works like an RV rear monitor there were three wires 12V+, Backup 12V+, Ground. When the tranny was in reverse there was a voltage applied to the backup wire and the camera would go on even if the monitor was off.
Would think you would need a switch to apply a 12V+ to that lead on the plug so you could manually select the normal display or rear view monitoring.
This is Summerwind Wild A_S_S guess (SWAG) here but it might be worth checking the schematic to see if I am guessing correctly
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2008 Highlander Limited AWD, Silver, SmartKey, VSC/TRAK, Bluetooth, Remote Start, No Nav, Tow package/hitch/color matched fascia, roof rack cross rails, Color keyed mud guards, Camry trumpet horns
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