nightrave

Thanks! Technically - the stock amp was powering the sub before, right? So would I be wrong to assume, that some of the wires that were going into the amp lead to the sub? I know I am probably wrong, but that does sound plausible :)

Holly molly! It's alive!!! After almost 7 months I've music in my car!! Thank you so much everyone! Two things I still trying to figure out to make the job perfect: 1. In order to connect the sub - do I need to lay down new wires from the sub to the new unit or do I just connect it parallel to one of the speakers (not ideal but...)? 2. How to make the antenna pull out when I switch to radio? Currently it's just retracted.

Thank you so much! You are extremely helpful! I do have a multimeter so will go and check the wires. The only bit that I am struggling to understand - which of the wires of the harness, that initially was in the amp, is the ground one. Or do I just take the ground wire from the ISO harness and attach it to car body?

ok. Now it's me just being me. I have pulled out all the wires from the iso harness (which I probably shouldn't do) and rearranged them according to the schema. Now nothing works at all. The radio doesn't even power on. I am clueless. I have tried taking the power from the amp connector - nothing. Trying to get the power from behind the head unit - nothing. I mean technically, in order for the stereo to power on, shouldn't those two wires connected be enough ( RED ACC and the YELLOW 12V)? Can't understand what I am missing to power it on.

Thank you for replying! Will check the cables one by one tomorrow morning! It is definitely not a fuse issue as I have checked them all with multimeter - all fuses are good (there were blown ones but I have exchanged them already)

Was your stereo working straight away? I had no power on it when I connected the harness. I had to cut the wires from the plug that used to be connected to the old head unit and attached the grey to red and blue(with yellow stripe) to the yellow wires of the ISO harness. Now the radio does power on but goes directly into protect mode. According to the manual it means that the speaker wires are short circued or touching the car. No idea what to do anymore. I have read that you need to ground the unit, which I have not done yet, but not sure if that's the issue. Any suggestions are greatly appreciated.

Hi Guys, After giving up trying to fix my sound (sound went dead after battery poles mixup) I am trying to figure it out how to solve it. I have read a lot about installing a new aftermarket head unit. The easiest way is to bypass the amp like they show in this tuturial. The problem is I can't get it :( What to wire where. I have found a ready harness here so I have 2 questions. 1. Do I just unplug two connectors from the amp, put in the two connectors from the harness and connect the other end to the new aftermarket unit? 2. Would this still work if my stock amp is dead? sorry for stupid questions, I am really confused and irritated for not having music in my car for almost 6 months :(

So I have bought and installed a used amp. Unfortunately it didn't solve the issue. Does it mean the main unit is faulty and I need to swap the whole thing? Any suggestions, please! Having no music is killing me!

Thanks for the tip, but I am in Dublin, so this would be a bit of a journey to me :) is it possible to remove the amplifier? - thats what i done with mine - posted it to them and the fixed and posted back It is possible. I'm just trying to figure out a reasonably priced solution. I can buy a used amplifier on ebay for about 25Pounds. Shipping (x2) plus repair will probably cost a lot more. So I am trying to figure out if a direct swap will work or if I will need to fiddle with ECU as well in order for the new amp to work in my Lexus.

Thanks for the tip, but I am in Dublin, so this would be a bit of a journey to me :)

So after trying a lot I think I've blown the amplifier. I have found a used on ebay, but the article description says, that "ECU WILL NEED RECODED TO YOUR CAR ". Does it mean I can't just replace old amp with new, but will have to fiddle around with ECU as well?

I fixed the trunk with master key lock. SOund still not working. All fused seem to be fine. So I am not sure wether it's the actual physical volume know not working . Can someone remind me if the spinning of the know should have haptical feedback and something displayed on the screen. Maybe just the know is broke as turning it results in no changed on the radio screen

Hey guys, I've a Lexus GS300, 2003. after my faux pas, where I misplaced the poles on the battery while putting a new one I had a lot of troubles. Car wouldn't start. After the car service changed some fuses and reset the ECU it starts and works. Only two more issues: 1. No sound from the stock radio (non mark levinson, plain one). There are lights on the LCD and CD changer plays, you can search for stations but no sound from speakers. 2. The trunk lever on the driver's side won't work. I can still open the trunk from the remote but the switch inside doesn't work. Are there any fuses to check? I think I have exchanged all the blown ones but...