[zapwizard]

There is no accessory wire on the 2006 PT Cruiser radio connection.
I found this out when I did my Car PC install. The factory service manual confirmed it.

If you bought a wiring harness as I did at say Best Buy, that harness has a wire listed as acccessory, but if you look at the cable coming from the car, there is no wire in that position.

The factory radio is turned on and off via a serial bus that connects a lot of the car systems.

So you will have to find an accessory wire somewhere else in the system.
Such as the wires powering the +12volt outlet.