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Old 11-17-2014, 09:46 PM   #1
z28drftr
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Join Date: Jul 2010
Default Parasitic draw 05 STi SBF 5

Hey so I'm working on an 05 STi and it has a draw on SBF 5

The battery has been dying in a matter of a day or two sitting

My multimeter needs a new 9v so I can get an actual reading tomorrow I've been using a test light instead

With the negative battery terminal disconnected and the test light connecting the two it glows bright upon removing SBF 5 it goes almost out there is still a small amount of light but it is not very bright and removing SBF 6 makes it go out completely

I've only been focusing on #5 so far as that one has a lot more of a draw I haven't had a chance to look into #6 yet

As far as I understand SBF 5 feeds

Data link connector
Fuel pump relay
Main relay
Electronic throttle control relay
IMM ECU
A/f and Oxygen sensor relay

So far I've pulled the fuel pump relay and ecu and there's still a draw

I wasn't sure of the location of those other relays so I proceeded to pull each fuse and relay both under the hood and in the dash as well as all relays in kick panel under dash and next to dash fuse panel and still nothing

From what I understand the "main relay" is the brown one next to the fuel pump relay on the passenger side kick panel anyways I pulled all 3

I can't unplug the data link connector as far as I can see it goes into the main dash harness

Where are the o2 and throttle relays located?
How should I go about testing the data link connector or does anyone have a diagram?
What else could it be?

Thanks
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Old 11-18-2014, 11:57 AM   #2
Cougar4
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2001 LL Bean Outback
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I assume you are aware that things need to go into the SLEEP MODE before checking for parasitic current draw. But if the battery is fully charged and in good shape but still dies in a couple of days there sure is a problem. On common place for this issue is the CD player having a fault. This may not be your case though.

While power does tie to the data connector it shouldn't be a problem unless something is connected to it. The Main Relay does provide power to a number of things but it should be turned off while the car is parked. The ECU provides a ground to the relay coil to turn it on. If the relay was somehow staying on while the car is parked that would really be causing a draw issue.

Get your meter working and allow things to go into the sleep mode before checking the current. You need to have things connected so the current flow isn't interupted in order for things to go to sleep. If power is disconnected and reapplied the clock starts over again. Normal current draw when things are in the sleep mode should be around 18-20 milliamps.
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Old 11-18-2014, 12:13 PM   #3
z28drftr
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What do you mean by sleep mode? How do I get it into that. Also the battery wasn't fully charged it had enough charge that I could see a draw tho
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Old 11-18-2014, 05:29 PM   #4
Cougar4
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The sleep mode is what the electronics for the car uses when the car is parked for a while and it happens automatically. For most cars it only takes a few minutes for things to go into the sleep mode after the car is parked. When that happens the current draw on the battery drops down to a minumum level. Some cars require a longer period, perhaps 20 minutes or longer. If the current draw gets interupted at all then you have to wait for things to go back into the sleep mode when power is restored.
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Old 11-18-2014, 05:53 PM   #5
z28drftr
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Being at the car was sitting for a day or two with a dead battery can I safely assume it went and sleep mode? I even let the car sit for a day with the battery disconnected and then tried using my test like to jump in the negative terminal of the battery and the negative cable and they were still a draw. Anyone know what else is on that circuit?
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Old 11-18-2014, 08:06 PM   #6
Cougar4
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I suggest you charge up the battery using a charger. Then connect up your meter in the current mode and let us know how much the current draw is. If there is an abnormal current draw on the SBF-5 line then we will have to track it down. One possibility that could be happening is the ignition switch isn't turning off things. If removing fuse SBF-5 does make the current draw drop down more than 100 milliamps when the ignition is OFF then check for power getting to fuses 11, 13, and 18 in the dash fuse panel. If power is getting to those fuses then the ignition switch has a problem. That is the most likely problem for a high current draw issue.
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