McGyver, did your dealer refuse to turn it OFF for you? In my case, I just paid them $100 and got it done. Seems like a less stressful route to me But you sound like you do have the smarts to DIY, so good luck with it.

2008 TCH|Nav|Leather|Sunroof|spoiler|tints|mesh grille|GS430 18x8 w/Goodyear Eagle F1 225/50/ZR18|6000K HIDs|Fogs|chrome door sills|LED interior lights