shortimer

We have a 2000 Lexus ES300 which has a 180 ma battery drain. With the ECU-B fuse pulled, the drain drops to 20 ma drain. I am trying to find out what items are supported by the ECU-B fuse. In addition to the drain, both power rearview mirrors are inoperative. Also, the driver seat will only go forward and back but not up and down. The seat back still can be adjusted. I would like to solve each of these problems but don't know what is causing the drain or why the mirrors are inoperative and seat is only partly functional.

msharper

I have a similar issue in my 2001 ES300. The seat will go forward and back, and the mirrors will adjust, but the driver's seat won't raise or lower, and the memory presets are DOA. This is a new issue, but since I'm t he primary driver of the car I can't pinpoint exactly when the issue began. Husband detailed my car as a Mother's Day service and realized that the controls were off. Thanks!

Oro

I had a similar problem on an Acura. The seat switch was partially broken.

If you are having battery issues too, remove the (-) cable and put a meter in line to see the drain.

Then try disconnecting the memory buttons and then the connector to the seat switch bundle to see if the drain drops back to normal.

espilman

Can ANYONE tell me where the ECU-B module is located on a 2004 RX330. Thanks in advance.

bakedcake

This post is pretty old but I had the exact same problem, about 50-100mA draw on the ECU-B fuse, which was causing my battery to die when sitting for about a week. Tracked it down with an Alldata wiring diagram to the power seat control ECU. I took a look at the buttons on my drivers seat and it turns out my "Set" button was stuck down, as soon as I got the button back up my draw dropped to around 22mA.