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Old 08-05-2012, 01:42 PM   #1
jonthesloth
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Member#: 184390
Join Date: Jul 2008
Chapter/Region: SCIC
Location: 714/562 LA/OC, California
Vehicle:
2005 CGM WRX
1999 Forester GREEN

OMGHi2U (*SOLVED*) Parasitic draw from SFB No.8 (ABS) - Can't find source!

Car: 2005 WRX, 5MT,
Battery dies after sitting for only 2 days.

So I had a 240mA draw when the car was off. Started pulling fuses, and when I pull the 30A SBF No.8 (ABS) fuse, it drops down to 14mA.
So I've found my culprit....Here's the problem:

I have the wiring diagrams for that system, and I'm not electrician, but I am sort of figuring it out.

I plugged the fuse back in and hooked the multimeter up to watch the draw again.

I went to the ABSCM&H/U and unplugged that fancy harness, but the draw didn't stop.

Then I unplugged the connector at the master cylinder reservoir, but the draw didn't stop.


I am trying to find out where else to check. I am seeing that there are relays in line, but I can't find them.

Any help would be much appreciated!
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Last edited by jonthesloth; 08-21-2012 at 03:18 AM. Reason: solved
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Old 08-05-2012, 02:32 PM   #2
jonthesloth
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1999 Forester GREEN

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edit: my ABS light and BRAKE light are now on as a result of the pulled fuse. They were not on at all if the fuse is in place. (other than being on when the car starts for a second and then turning off)

Last edited by jonthesloth; 08-05-2012 at 06:11 PM.
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Old 08-05-2012, 02:42 PM   #3
Cougar4
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The ABS light shouldn't be on if things are ok with the system. I suspect there may be something added to that circuit that isn't factory installed. Check under the dash an the hood and see if you can find any mods to the wiring.
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Old 08-05-2012, 03:59 PM   #4
jonthesloth
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2005 CGM WRX
1999 Forester GREEN

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There were some gauges installed and removed some time ago, but i do think the wires are still there behind the column. I'll check it out as soon as I can and report back with my findings.
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Old 08-05-2012, 06:15 PM   #5
jonthesloth
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2005 CGM WRX
1999 Forester GREEN

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There are some wires, but they are coming from the Stereo wire harness, and as a result, are unaffected by that fuse.

If I pull the audio clock fuse in the cabin, that is where these wires are hooked up to, the draw is still there and clock/radio do not work.

Side question:
Is the motor relay and valve relay in the ABSCM? And if that's the case, by unplugging the control module, and the draw still being there, then the relays aren't the problem, right?
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Old 08-05-2012, 11:20 PM   #6
Cougar4
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Relays by themselves really don't cause a drain problem like this, unless perhaps they happen to have stuck contacts and that isn't a real common issue. If a relay is involved with the trouble it is usually as a result from something turning the relay on when it shouldn't be. By disconnecting the ABS system controller you isolated anything in it and anything it may control.
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Old 08-06-2012, 02:39 PM   #7
jonthesloth
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2005 CGM WRX
1999 Forester GREEN

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Ok so all of the aftermarket wiring has been removed. It was attached only to the stereo wiring harness.

I still have the draw.

I have all of the dash panels removed, so now would be a good time for suggestions.
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Old 08-06-2012, 11:08 PM   #8
Cougar4
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Winestone

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To make sure there isn't a problem with the alternator remove the rear connector to it and the main output cable and isolate them from ground. Then see if that changes anything. The main cable is hot to the battery so you should remove the battery ground connection before you disconnect it from the alternator.

If the alternator isn't causing the trouble then check the wiring in the fuse panel that ties to SBF-8 and see if there is any bridged connection to the wht/red wire. Check the other end of the wire and see if anything ties to it. If you don't find anything then the easiest way to fix this trouble may be to run a new wire and eliminate the problem that way. It seems the connection to the trouble would have to be from an exposed area of the wire harness unless the splice has been hidden inside the harness somewhere.
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Old 08-08-2012, 03:07 PM   #9
jonthesloth
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Location: 714/562 LA/OC, California
Vehicle:
2005 CGM WRX
1999 Forester GREEN

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Problem Solved:
There was an aftermarket shock sensor from an aftermarket alarm that was grounded to the chassis.
I had the aftermarket alarm removed by a professional last Thursday and the draw was still there. Looks like he missed something.

Cougar4,
Thank you so much for your advice. You kept me going long enough to discover the problem. The sensor was so far jammed up into column, It was hidden really good and i was laying upside-down on the drivers seat trying to take this thing out. I wouldn't have kept looking if it weren't for your advice.
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Old 08-08-2012, 04:19 PM   #10
Cougar4
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Winestone

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You're most welcome for the help Jon. Good work on your part. Once again persistance pays off in spades. Another happy Soob driver is on the road again.
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