Welcome to the North American Subaru Impreza Owners Club Sunday July 5, 2020
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 05-03-2020, 02:18 PM   #1
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default Battery dies instantly SBF-5

Need some help here. My 2004 STI keeps draining the battery in a matter of a few hours and quickly enough to prevent a start after two minutes of connecting the battery. I pulled all the fuses and found SBF-5 to drain my now almost dead battery from 5v to 2v instantly and it continues to drain from there.

My clock also draws it down fairly quick. There was an aftermarket stereo and sub/amp installed that I went through. Amp and sub are removed now. The gauges are pulling power from the removed clock wires and grounds go to battery.

It died yesterday idling. New battery and alternator last month. This has been going on for almost a year but car is always parked while I travel. I maybe drove it twice this year.

Disconnected the 4 relays on the passenger side and still get SBF-5 draw. Checked draw at fuses 11, 13, and 18 as I saw somewhere on here and there was nothing. So something is still pulling it down. I am the worst at using a meter so will need all the help I can get!
* Registered users of the site do not see these ads.
Scotty4 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 05-03-2020, 02:21 PM   #2
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

To add. When I disconnect the possitive the battery starts climbing back up to 12. So multiple issues?
Scotty4 is offline   Reply With Quote
Old 05-03-2020, 02:43 PM   #3
awnetve
Scooby Newbie
 
Member#: 464787
Join Date: Mar 2017
Chapter/Region: International
Location: Caracas
Vehicle:
2005 STi
Silver

Default

Check the alternator plug. It tends to come loose.
awnetve is offline   Reply With Quote
Old 05-03-2020, 02:51 PM   #4
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Pulled the plug, greased it, put it back in tight. Reconnected battery and dropped from 7 to 5v instantly.
Scotty4 is offline   Reply With Quote
Old 05-03-2020, 03:40 PM   #5
viper_crazy
Scooby Specialist
 
Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

Default

Alternators can drain the battery when they die. I'd be looking at your alternator.

A guy on YouTube (Devin Niemela) had a similar issue with his lowered widebody FRS. Battery drain issues out the wazoo. Replaced the battery with a fancy Optima and still drained it within hours and checked everything over several time. Old alternator was putting out a healthy charge even. Replaced the alternator and all cured.
viper_crazy is offline   Reply With Quote
Old 05-03-2020, 03:44 PM   #6
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Alternator was new about a month ago as I was reading up on the voltage regulator causing stray current into the harness and giving missfires. Since changing the alternator and adding a ground kit, the missfires stopped. Does not mean Oreilly gave me a bad alt. Could I disconnect the alt and see if it still drains?
Scotty4 is offline   Reply With Quote
Old 05-03-2020, 03:47 PM   #7
viper_crazy
Scooby Specialist
 
Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

Default

Quote:
Originally Posted by Scotty4 View Post
Alternator was new about a month ago as I was reading up on the voltage regulator causing stray current into the harness and giving missfires. Since changing the alternator and adding a ground kit, the missfires stopped. Does not mean Oreilly gave me a bad alt. Could I disconnect the alt and see if it still drains?
Yup, by all means. Unplug the harness and charge cable and see what happens. Misbuilds do happen from time to time. Maybe it was the last one built on a Friday afternoon. Poor guy just wanted his Friday beer...
viper_crazy is offline   Reply With Quote
Old 05-03-2020, 04:27 PM   #8
the_saintusa
Scooby Newbie
 
Member#: 171486
Join Date: Feb 2008
Chapter/Region: International
Location: Hiding from The Google
Vehicle:
2019 911 GTS
Silver

Default

I had a short under the fuse box.

Was killing the battery (not as quick as the OP) and giving intermittent start situations.

Had the fusebox (in the engine bay) replaced with a used unit and problem solved.

No idea what happened, but it looked like the original fuse box was partially 'melted' for some reasons that were not apparent.
the_saintusa is offline   Reply With Quote
Old 05-03-2020, 06:34 PM   #9
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Quote:
Originally Posted by viper_crazy View Post
Yup, by all means. Unplug the harness and charge cable and see what happens. Misbuilds do happen from time to time. Maybe it was the last one built on a Friday afternoon. Poor guy just wanted his Friday beer...
So I pulled it off and the battery came up from 6 to 8v. Touch the charge post cable and it drops to 5 again. With the alternator disconnected if I plug the fuse for the clock in, it drops from 8 to 2v. Thoughts?
Scotty4 is offline   Reply With Quote
Old 05-03-2020, 09:45 PM   #10
viper_crazy
Scooby Specialist
 
Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

Default

Couldn't tell ya off the top of my head. It's pretty obvious whatever is on that circuit is the culprit.
viper_crazy is offline   Reply With Quote
Old 05-06-2020, 11:40 PM   #11
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Quote:
Originally Posted by viper_crazy View Post
Couldn't tell ya off the top of my head. It's pretty obvious whatever is on that circuit is the culprit.
I pulled all the wiring apart for the radio and the clock plugged the fuse back in and it dropped. Dig some looking at the diagram and FB9 Fuse 2 is my culprit. It does clock, radio, all interior lighting, and the door locks. Where would the Door Lock timer be located?

And whats the difference between keyless and non keyless entry? I have the fob to lock/unlock and the thick blue STI key.
Scotty4 is offline   Reply With Quote
Old 05-06-2020, 11:44 PM   #12
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

To add, looks like it pairs with FB8 F2 to the B1 terminal of the Auto A/C Control Module.
Scotty4 is offline   Reply With Quote
Old 05-22-2020, 11:32 PM   #13
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Update: sbf5 looks to be holding strong. Maybe .1v every 5 minutes of drain. Still might be an issue. Real problem looks to be fuse 2 for clock.

Buddy and I just figured out that with the door open, it drains. With door closed its fine. There is a weird clicking (relay?) Under the dash. No ignition switch light ring, no door chime, its really tough to activate alarm with fob. New battery in fob, still the same.

Any one help?

Last edited by Scotty4; 05-23-2020 at 12:10 AM.
Scotty4 is offline   Reply With Quote
Old 06-01-2020, 11:27 PM   #14
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Following up: SBF-5 wasn't the cause. Fuse 2 going to the door lock fuse 3 in the cab looks to be the culprit. It is probably the keyless entry?

I plugged and unplugged the driver door switch, got nothing. Looks like the door timer is uninstalled. Only other thing would be the KE. So I will disconnect tomorrow and see where that gets me.
Scotty4 is offline   Reply With Quote
Old 06-05-2020, 09:40 AM   #15
4bang4now
Scooby Newbie
 
Member#: 489016
Join Date: Aug 2018
Vehicle:
2015 STI
Silver

Default

You need to be doing this with the meter to measure amperage not voltage. A few hours is a huge draw of 2A or greater.

Don't keep disconnecting and reconnecting the battery. Some systems "wake up" when you do this and pull quite a bit of current 1-2A until they go back to sleep. Same with open/ closing the door and other things which trigger relays requesting power.
You will go in circles until you start under the hood with the car sleeping. If you need the schematics for your car I can send them to you.

Leave the meter hooked up between the battery cable and the battery.

There will always be some draw <.05A.
4bang4now is offline   Reply With Quote
Old 06-10-2020, 09:32 AM   #16
Scotty4
Scooby Newbie
 
Member#: 487723
Join Date: Jun 2018
Chapter/Region: NWIC
Location: Olympic Penninsula
Vehicle:
2004 STI
Blue

Default

Quote:
Originally Posted by 4bang4now View Post
You need to be doing this with the meter to measure amperage not voltage. A few hours is a huge draw of 2A or greater.

Don't keep disconnecting and reconnecting the battery. Some systems "wake up" when you do this and pull quite a bit of current 1-2A until they go back to sleep. Same with open/ closing the door and other things which trigger relays requesting power.
You will go in circles until you start under the hood with the car sleeping. If you need the schematics for your car I can send them to you.

Leave the meter hooked up between the battery cable and the battery.

There will always be some draw <.05A.
Figured this out the hard way. But I also got to the bottom of the issue. They battery kept dying while running making me think ground since I was disconnecting and such, even after charging the battery fully, the car would die in a few minutes.

We then looked into the charging system (first place I will start from now on) and the new alternator from Oreillys was not charging. Went to the stealership and got an OEM alternator for $540, put it in, and she runs like new.

It looks like I can confirm aftermarket alternators do not charge correctly.
Scotty4 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 03:57 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2020 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.