I finally got the stock sub working with my aftermarket stereo. No audio integration harness is needed. All you need is a RCA to speaker wire cable and tap into the Sub + and Sub - wires (black wire and white wire). I was following the diagram http://www.intellexual.net/faq/lexusstereo.swf for Socket D and it lists the Sub + signal as D1 and Sub - signal as D5 ; however that did not work so I thought maybe I was looking at the diagram backwards. So I tried tapping the speaker wire to D4 and D10 and heard the subwoofer. So it appears you need to tap into D4 and D10 instead of D1 and D5. Great day. Got the subwoofer working and installed the double DIN Metra kit.

How much is that kit exactly? I could not find pricing on there website..

Pic of double din!

I really appreciate you posted that information here because I never did figure that out and gave up. I have reason to go back and work on it again. You may want to bring that infor to the admin on intellexual.net, they will post corrections.

I'll post pics of the double din tomorrow.

Double DIN kit has MSRP of $14.95 + shipping

Headunit sub output to socket D

Double DIN kit

another pic of the Metra kit

oooh, i like that dash kit

I got my metra in the mail today!!!

Nice work - looks very clean.

finally looks really good

looks great ! which HU is that? I just got my dash kit today and a DNX8120 is on the way

Thanks! It's the DNX7120.