speaker wire colors ls400

i'm going to be installing an amp in a '90 lexus ls400 for my friend. i need speaker wire colors to install line out converter. please help. and if you have done this car before, any tips or secrets would help. i am an experienced installer, but any extra info would make this a lot easier. thankstomturbotom

where is the amp? i'm using a high to low converter. amplified speaker to rca. it seems easiest.

Tom, I did this car last summer, but it was a newer model that yours. Hopefully I can recall as much as possibly from memories to help you out. First of all, you do not need to open up the dash to get to the head unit at all for your remote. You can get to the remote from the factory amp situated above the gas tank, and I believe it is in the top left comer with the vehicle forward facing. As for using your line converter you can tap the signal off the rear speaker. As esmith69 mention, you can do the “simple speaker popper” for your polarity or a DMM. As for the power wire, that would probably be your challenge. I didn’t have any success at all fishing the power wire through the firewall with a coat hanger. If you do, please post it up and send me a message. I gave up trying after several attempts because it scare me enough that I didn’t want to short out a wire with the coat hanger.   If you do want to attempt this make sure you round out the edges of your coat hanger so that it doesn’t get you into any trouble. What I ended up doing was drilling through the firewall instead. I don’t remember whether I did it through the driver or passenger side, but I do know that I ran the power wire to the back on the passenger side.   To get the power wire to into the truck you will need someone to help you here unless you want to try removing the backseat. At this point you will need your coat hanger and a friend to lift up the back seat panel so that you can poke the coat hanger through the very top corner near the rear speaker. Don’t attempt to drill here unless you are absolutely sure because the gas tank is behind the back seat panel. You will find it very difficult seeing an opening to poke your coat hanger though since the hole is barely visible, but it is there.    You might even need a bright light in the truck when you are attempting to do this. I am assuming the design of the car didn’t change much from the newer model. Let me know if it is different from what I have described to you. Anyway, I hope this sort of help you out a bit.        Be careful whose advice you buy, but be patient with those who supply it.

i got it done, no problem. Although the firewall had no room, and the backseat wouldnt comeout,it went pretty smoothly. Since I couldn't get the back seat out, I ended up drilling a hole in the back deck where it fold behind the seat. It wasn't my first choice, but the wire is barely visible at all, especially with the window tint. After I got the wire under the rear deck, I just fished it through a hole near the rear sub, which ended up using for my high to low converter. It was fairly easy, and I appreciate the advice from every one. Tom