That's a feature of the car, not a feature of the radio.

If you installed an Empeg into that minivan, it would behave that way. (Assuming you properly connected the empeg's power wires to the factory harness.)

I'm sure something like that could be rigged for any car, but again, the empeg's circuitry would have nothing to do with it. The wiring tricks would all be external to the empeg.

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Tony Fabris