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What it is, is the black boxes (sometimes one gray) that are mounted to the left side strut tower towards the rear of the engine compartment. They will tell you everything you need to know, and the test lead is already installed. Read through the FAQ again, or buy a Haynes manual at least, and look into it farther.
It is a very sophisticated sounding term for a very simple setup. Something that implied that it actually put out codes would be more appropriate, but apparently Volvo took a hint from another manufacturer quite some time ago in calling it that.
Plus, you have DTCs which is "diagnostic trouble codes".
Ooh la la. DTCs.
So, knowing that, go out, plug in the DLC, and pull out the DTCs. Or plug the wire into the diagnostic box and get the codes. WHatever sounds more friendly.
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chris herbst, five volvos.
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