if you take the lower panel off on left side of steering wheel you will be able to access to put the wire through, probably use a flashlight and take the speaker grill off and speaker loose so you can see where the wire is, on the right side remove the heater duct right under the glove box, what speakers are you putting in? i put some infinity kappas to replace the factory, i only wish i would have had door speakers to make the process easier to put door speakers there which i got some 6' mb quarts, mb stands for mercedes benz of course. back in the back i put a single 12L kicker solobaric powered by a rockford 800.2 and 400.4 for mids and highs, i'm gonna replace the kicker with two rockford 12' hx2's and have the trunk area custom enclosed with pop open drawyers for the cd changer, vcr and amps will be sunk into floorboard, mercedes has those funky mounts for their back speakers, just made some wood brackets to replace them, up front i've got the clarion vrx925 7' indash cd/dvd/mp3 changer. i rewired everything and removed the back seat to run wires under carpet, it was a little pain but i survided it. what are you doing with yours?