IS300 reversed battery polarity.
Alright, so I've done a bunch of searches (on here, on google, etc) where people have done this, and had similar issues, but I could not find anything.
What happened? -
I went to start my 2005 IS300 that had been sitting for a while, and the battery was dead. I was frustrated and in a rush, and managed to reverse the polarity of the terminals on my IS300. In my defense, whoever had the car before me, put new terminals on the car, and reversed them (the negative terminal is painted red) and in my haste, I hooked them up wrong.
What's the issue? -
When I realized what I did and swapped to the correct terminals, the car alarm started going off. I got the alarm turned off, disconnected the battery, and checked and replaced the fuses in both the driver and passenger side, and inside the engine bay fuse box. I replaced about 5 fuses in total (I forget which ones), and the rest checked good. I hooked the battery back up and charged it, the car started right up. I have some lingering issues however. My gauge cluster does not work(if I rev the engine up a bit, I can see a faint glow of a light trying to come on) other than that, no lights or needle movement, No radio, No clock, No power windows, No power locks, No seat warmers, No power sunroof, no power on my rear-view mirror, I believe my OBDII connection port is inoperable as well(I have an OBDII scanner that connects to my phone via blue-tooth, and my phone could not find the scanner when connected to my car). My power seats work, dome light works, as well as the horn, and I believe the headlights are working properly. I do not have access to the car right now, as I'm away at school. I'll be able to in a week or two. I just wanted to see if you guys could give me some suggestions on things I can check when I get back home to my car, relays? ECM? anything else?