The CD changer and navigation module has a permanent power supply.I tapped off this from my dension. Since the dension allows you to control the i pod from the head unit ,I cannot see the need to go to the trouble of routing cables through to the cabin. There is planty of space to put an i pod or USB drive in the front compartment where the navigation/ CD unit sits.The dension now has bluetooth capability,if you have a PCM it emulates having the telephone option installed.The 987 and 997 are identical in terms of front end and wiring for the desnion.
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