Help! 1997 ES300 Parasitic drain on battery and tracked it down to the ECU-B 10A fuse

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Feb 26, 2015 | 12:51 AM

#31

ES300NZ

Lead Lap

Joined: Jul 2014

Posts: 662

Likes: 33

From: New Zealand

Quote:

Originally Posted by Emuller

The 7.5 amp fuse was pulled and left out the last 24 hours. Car battery held it's charge, and motor starts fine, but many features are inoperative. IE locking door w/ fob, door lock switch on door , air conditioning settings, window switches to name a few.

> - this means that I'm almost certainly wrong about the function of that circuit.
> - I shall tell my wife, the unthinkable has happened. I was wrong. The world will end now. :P

Quote:

Originally Posted by Emuller

The issue is definitely the circuit. My problem now is how to isolate the problem item on that circuit. I ordered a haynes repair manual, so this may cover a in depth repair, or at least an accounting of all the items impacted by the ECU-B. Is there a way to disable each of the users of this circuit?

>- if it was me, I would open up the electrical diagram and follow that.
> - you could track down the plugs and disconnect things one by one.

Jun 21, 2020 | 08:55 AM

#32

cdunca647

Driver School Candidate

Joined: Nov 2014

Posts: 6

Likes: 0

From: CA

Seat "Set" switch

+1 for the seat set switch root cause for drain via the ecu-b fuse. I was able to get the button loose. Super easy fix. Will probably disable the button completely to avoid recurrence.

Sep 8, 2020 | 09:18 AM

#33

asorowka

Driver School Candidate

Joined: Nov 2008

Posts: 2

Likes: 1

From: Ontario

Quote:

Originally Posted by cdunca647

+1 for the seat set switch root cause for drain via the ecu-b fuse. I was able to get the button loose. Super easy fix. Will probably disable the button completely to avoid recurrence.

Glad I came across this thread. I had similar battery drain issue. Replaced 3 batteries over the past year and a half, along with countless trickle charge sessions. Never would I have suspected a stuck Seat Set button being stuck. Just for yuckers, I decided to check if I had the issue. Sure enough, the Set button was stuck in the down position. I used a dental pick to pry it free. So far, so good. After a few days, starts great. Now I just need to track down why my rear lights fault dashboard light is illuminated, although all back lights seem to work.

Oct 31, 2024 | 12:18 PM

#34

GS4001998

3rd Gear

Joined: Oct 2020

Posts: 3

Likes: 0

From: Al

Fuses

Quote:

Originally Posted by DGIKULJOT

I found another post that says it is related to the anti theft, door locks, security system.

But lets just wait for others to confirm this

On mine, that fuse is ECU-IG. ECU-B2 is power seats.

Dec 23, 2024 | 08:11 PM

#35

groomerz

Driver

Joined: Feb 2009

Posts: 83

Likes: 6

From: Il

Thx to all 98 es300 80 mA draw dead battery , Seat set switch stuck down , pulled it up and cleaned with brake cleaner and now draw is 10 mA. switch had some green on one of conductor just left switch button unplugged as my daughter doesnt use the seat memory.