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2004 Honda Pilot parasictic load

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Mar 18, 2020, 9:55 AM

Post #1 of 3 (364 views)
2004 Honda Pilot parasictic load Sign In

Hi,Have a 2004 Honda Pilot with a parasitic load that drains the battery so that the car won't start after sitting for a couple days.
Battery is brand new.
Have isolated the parasitic load to fuse 13 on the passenger side under dash fuse box.
If I pull this fuse, the battery maintains its charge and starts the car easily even after several days.

There are a whole raft of things on this little 7.5 amp fuse, and I don't want to try to troubleshoot each of these loads to find which one has the parasitic load.
My question is: Could I change the hookup to the hot side of this fuse so that it is not hot when the ignition is off? That is, hook the supply end of the fuse to a 12 volt source that is only on when the ignition is on.

I can start and drive the car with this fuse pulled altogether -- the only thing that I have found (so far) that does not work with this fuse pulled is the passenger side and rear seat power windows -- the driver window still works.
I realize that it would be better to go through and find the actual problem, but this is an occasional use backup car for snow storms, and just does not seem worth the work to find the problem -- unless someone has a specific area I should look for it.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 18, 2020, 10:34 AM

Post #2 of 3 (350 views)
Re: 2004 Honda Pilot parasictic load Sign In

Gary: It's a pest but better to now find it on each item on that fuse. Pull bulbs or whatever then do the drain test. Don't forget to allow time for battery's normal draw for memory to quit it = few minutes you may see it hooked up this way a locked thread above:
> <
Other to check is the battery itself? I know, you said new doesn't mean it's any flipping good when YOU got it or now having gone too low, too many times can do serious harm. To check for that, charge just it up with a charger and disconnect it see if it is losing it by itself no longer involved would be rare but does happen IDK why it would peg a circuit?
Before trying to make that circuit ON when running only (strongly suggest not to) beware it may be losing memory every time you shut off? Sorry, I can't know the whole list it's empowering only so many have power with a vehicle shut off anyway.
In the meantime you might just keep this on an automatic battery charger that will shut off when it thinks it's done this problem may take a while to find.
First looks would include wiring to driver's door for stuff enable all the time and or any aftermarket anything so much as a radio/tunes anything the remembers where it was and the time included and more likely than OE stuff big time.

Good luck!

(edit to make link clickable)

(This post was edited by Tom Greenleaf on Mar 18, 2020, 10:37 AM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 18, 2020, 10:34 AM

Post #3 of 3 (350 views)
Re: 2004 Honda Pilot parasictic load Sign In

No, you cannot cut power when the key is off. That fuse operates an assortment of integrated modules including the security system and keyless entry, so they must have power all the time.

You're going to have to start isolating these modules to find out which one is causing it.
Some of them operate courtesy lights so check them first.


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