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

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02-26-15, 12:51 AM

#31

ES300NZ

Lead Lap

Join Date: Jul 2014

Location: New Zealand

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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.

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06-21-20, 08:55 AM

#32

cdunca647

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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.

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09-08-20, 09:18 AM

#33

asorowka

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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.