So we picked up a 2002 Lexus gs300 for my wife and after we got it and it sat over night we found it had a bad battery. I replaced the battery around 9:30 am we went to take it to the store around 12 battery was stone dead. It will drain a brand new battery in about 2hrs. I put my multimeter on it was reading 12.40 with in 15 min it dropped to 9.80. Has a new alternator new starter new ecu new battery. I have pulled any fuse or relay I could find unplugged the ignition switch. Still can't find this voltage drain I know these cars tend to have a bunch of diodes and have only found 2. Any help would be great

 

Have you actually tested for parasitic drain?

 

You mean by hooking the meter in series with the battery? If so yes and it says it's drawing 8.34 amps

 

 

https://www.google.com/webhp?sourcei...rasitic%20draw

 

That's same vidwobi watched and yes that what I am doing

 

I know on mid 2000's to about 2010/11 the HFL (hands free link) units i.e. bluetooth units caused a parasitic draw if they failed in hondas/acuras. Worth a shot since a third party designed the HFL units, and it may be the same manufacturer for Lexus.

 

I was able to find it it was a 15amp fuse on the passenger side fuse box but there is no lid on it to tell which fuse it which. Anyone have a diagram for passenger pose box

 

Need to know what this fuse in red is for

 

You set it up right. But did you wait for at least 30 mins before testing? The modules need time to power down on their own. It is not unusual for modules to remain awake for almost an hour on some makes.
Accordign to my diagram,there is no fuse in that slot. There is a 15a fuse above it ,though,with the letters "TV" as its designation.



Dont know if those letters imply the obvious,or if it means something else in Toyota lingo,but youre likley gonna need a wiring diagram.

 

I didn't have 30min by then the battery would be dead . Whatever the fuse it it doesn't affect anythin as far as I can tell lights horn Windows ect all still work

 

Then the battery is bad as well. An 8a draw should not kill a battery in 30mins,if it does the RC of the battery is very low.

 

they may remain awake, but they shouldn't be pulling 8 amps, sounds almost like a transmission solonoid is stuck on or something

 

the one marked TV actually means television, weird, but it's for the navigation screen, if there is a fuse in the empty slot below it, I would almost bet it's for the factory amplifier for the stereo, if it's not shutting off, it can pull quite a bit of current. Depends on if this car has the high end audio system, it's just like an aftermarket stereo that has a remote wire that malfunctions, if this happens the amp stays powered up and kills your battery

 

No has a brand new battery 3 days old and already had it checked it was actually pulling 13.2amps that was showing 8 since it was draining the battery

 

Ya it ended up being for the factory amp. Now the other issue ibhave it when the car is on the acc position the blower motor works and blows out of the vents but when the car is on the ON position to start it the blower shuts off and nothing comes out of the vents. Maybe a ignition switch or blower motor resistor?