.235 Amp draw from ECU-B help needed! (2009 GX470) (1 Viewer)

[DirtyD1985]

Good Morning Everyone,

My 2009 Lexus GX470 battery keeps going dead after 3 - 4 days of sitting. I thought it was an older battery so I had it replaced with a brand new interstate 27F battery. Unfortunately it died again after some recent business travel for 3 days sitting unused in my garage.

After much reading I did my first parasitic draw test on my vehicle. I found that the fuse ECU-B is drawing roughly 230 MAh of current when the car is asleep. There are several connections that run through ECU-B, but I wanted to ask if anyone knows of any common culprit(s) that I should investigate first? auto mirrors, auto headlights, dome lights anything you all have had experience with draining your vehicle battery.

Lexus told me the normal current draw at rest for this vehicle is 50 mAh and should be able to sit unused for at least 2 weeks and still start up. So I am about 180-200 mAh draw more than i should be.

Any information would be greatly appreciated!

 

[CarolinaGX]

I had an issue recently, after changing my headlights to the Hikari LED's. It sat for about a week or so and acted as if the battery died (clock dead, windows had to be reset, etc.) but it still cranked albeit slowly. I turned my headlights from Auto to off and haven't had an issue. I am not sure of the cause of my problem though.

 

[DirtyD1985]

I had an issue recently, after changing my headlights to the Hikari LED's. It sat for about a week or so and acted as if the battery died (clock dead, windows had to be reset, etc.) but it still cranked albeit slowly. I turned my headlights from Auto to off and haven't had an issue. I am not sure of the cause of my problem though.

My headlight bulbs are new and I used the OEM standard halogens. I have recently started turning the stalk to on and off instead of auto, but dont see any difference in draw when asleep.

 

[GXO]

Where do you store your key? If the transponder is in range the truck never really goes to sleep.

 

[DirtyD1985]

Where do you store your key? If the transponder is in range the truck never really goes to sleep.

I keep the keys about 25 feet away on a hook in my kitchen.

 

[JayCubB]

Did you ever resolve? Dealing with same!

 

[GXO]

It can also be the mirror controls and wiring/motor. They stay hot and if there is any short it can draw.

 

[Rednexus]

I had this problem on mine. It was the rear dome light assembly (very back of the rig). Replacing it with a used assembly from eBay fixed it. It took hours to troubleshoot. I finally figured it out as the parasitic draw went away when the dome light was turned off. If it was set to "door", it was always drawing power (despite the light not being turned on).