So far it looks like there will have to be a small electronic module to interface the hazard light circuit to the horn circuit for the audible chirp. Toyota produced 2 different series of TVIP (Scion Security) for the tC. I have the earlier one that has a small, 1-wire capped-plug near the glass breakage sensor. That maybe a input signal ground. Finding the wire schematics on these TVIP has proved troublesome so I will have to trace the wires out.
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