Chrysler Repair: NO BUS on Pt Cruiser w/new stereo, aftermarket stereo, comminication

Question
I just installed an aftermarket stereo on my 2002 PT Cruiser. The stereo seems to work alright but now there is a "No BUS" showing up on the odometer and the airbag & brakes lights are on and the odometer isn't doing anything. Could it be possible I wired something incorrectly? Or does this mean something is loose? I did notice the radio isn't picking up stations very well.

Answer
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Hi Matt,
The Bus is a digital data comminication circuit that connects many electronic parts together. There is a part of that circuit on a natural color 2-pin/one wire (violet/yellow) plug at the rear of the original radio. What was done with that plug/wire when you installed the new unit? Was there any mention of it in the instructions for the new unit?
Roland
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