Hey, CL.

Just replaced my battery following a long, long winter after putting my 99 LS400 away and of course, a friend and I put in the battery wrong. I knoooow, it was stupid and I learned my lesson about being careful.

While in wrong, all the lights were on and the horn blared for the 5-8 seconds we had it on wrong.

To no one’s surprise, we’re left with many blown fuses. I’m gonna grab a fuse kit and have at it, but I want to know ahead of time if I’ve just screwed myself over and cooked important internals? I know it’s real hard to diagnose that so far, but here’s what we got.

- The car starts. After a whole season of being in the cold, it runs a bit rough but I’ve got some fluids that need replacing.
- The passenger side foot light, seatbelt lights, keyhole light and the door open light on the dash all work. Even unlocking the car beeps and opens the locks.
- Every other interior / exterior light, trunk button and lock button on the fob and my head unit as well as AC + door buttons do not work.

Is it sounding like I cooked anything important that’s not a fuse? I already know I got some of the fuses because I peeked at them.

I appreciate your help, CL.

 

Electricity is a wild and finicky beast. It's hard to say. In theory the fuses should protect the car, but, anything can happen.

Best of luck that you escaped without too much harm!

 

Good point, that thought has been sitting in the back of my mind for a while. There was no smoke smell or no sparks, which is a relief. Gonna run over to the local parts store and pray I didn’t just fry my whole car, lol.

Also, you helped me last time I was here, I hope you’ve been doing well!

 

Check the big boys first, fusible link etc., they are there for a reason.
They are located behind and in front of the battery under the plastic covers. THE HIGH VOLTAGE FUSES ARE SECURED FROM UNDERNEATH THE JUNCTION BLOCK AND WILL NOT SIMPLY PULL OUT.
IIRC the smaller of the 2 in the second pic is in front of the battery.
All the little guys are likely fine.

 

I've had my car for close to 5 years now, the gal who owned it previous to me used to let the car sit for many weeks at a time, battery would go weak, she jump started it with reverse polarity very early in the cars life cable on backwards. It blew that big ole 120 amp fuse. Dealership re-flashed the ecu, not sure if it needed it or not but they did it anyways, they didn't find it to be damaged. Car is fine still over 20 years later, dealer just combed through everything, checked all pertinent things.