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Old 11-13-2020, 03:37 AM   #1
Tunroe
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Default 2008 STI fans and relays cycling

My fans and relays are cycling with the ignition is in the first position. Where you would put it to use code reader.
Don't remember it doing that before.
Any ideas???
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Old 11-13-2020, 08:47 AM   #2
Elbert Bass
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Did you plug the green connectors together?
If you did that's the answer. Green plugs plugged together, key in the run position the ECU runs a duty cycle test. Fans/relays on-off, as well as purge solenoid, vent solenoid...

If you are plugging in the green connectors to read codes you must have some screwed up code reader - that is not neccessary just to read codes on that model.
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Old 11-13-2020, 11:07 AM   #3
bicycle_wreck
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Had the car just been driven? If yes, it's possible your coolant was still 200 F or above, so the fans would kick on. If not, next question.

Was the A/C or defrost on? If yes, the fans cycle to pull air across the condenser, even if the car isn't running.

As far as the green connector, I don't think any of the newer Subarus use those. I remember using them on a friend's bugeye to reflash a tune, but I haven't used one since.

EDIT: I was very wrong. For anyone searching in the future, see Mulder's and Elbert's posts about the green test mode connectors. The 08 STi does have them.

See also: https://www.iwsti.com/threads/test-m...7/post-2235300

Last edited by bicycle_wreck; 11-15-2020 at 01:02 PM. Reason: Correcting my bad advice for future searches.
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Old 11-13-2020, 06:25 PM   #4
Tunroe
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Default Thanks for replies, guys

Negative on the car just being driven. This was the next morning. Day after having a stereo professionally installed.
I read about the green test plugs on some models. Thought maybe installer had plugged them together by mistake.
Looked for them under the steering column. Do not see them.
Also read that 2008 STI doesn't have them. Is this true?
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Old 11-13-2020, 07:27 PM   #5
bicycle_wreck
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Did you have the HVAC control in the A/C, defrost, or feet position? If so, that might be the "issue."

Last edited by bicycle_wreck; 11-13-2020 at 08:54 PM.
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Old 11-13-2020, 07:28 PM   #6
Mulder
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They may have improperly connected a data pin in the radio harness that would only be used with the factory unit but should be left unused with an aftermarket radio. If so this might result in the car going into test mode.
If you're able to do so try pulling the radio out and unplugging it, and see if the issue goes away. Or just take it back to the install shop and have them deal with it.
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Old 11-13-2020, 08:00 PM   #7
Elbert Bass
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Quote:
Originally Posted by Tunroe View Post
Negative on the car just being driven. This was the next morning. Day after having a stereo professionally installed.
I read about the green test plugs on some models. Thought maybe installer had plugged them together by mistake.
Looked for them under the steering column. Do not see them.
Also read that 2008 STI doesn't have them. Is this true?
Later models they are above the ECM. One way to tell - is your check engine light flashing when the fans are cycling?
Look in the passenger floorboard. Pull the carpet back and look just behind the top edge of the carpet along the wiring harness that goes behind the metal ECM cover. I bet you will see two green plugs plugged together.
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Old 11-14-2020, 05:27 PM   #8
Tunroe
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Negative on the heat/a.c. being on. Double checked. Everything in the off position.
Since last reply, i have had a chance to pull codes. Getting one for O2 sensor, bank 1, sensor 2.
Surely this would cause the CEL. My question now is will that cause my fans to cycle as soon as I turn the key to the on position.
I can clear this code, but, it comes right back. As soon as I cycle the key back on. Dont even have to start the car.
I believe this happening after the stereo install is just a coincidence. Cannot be sure until I replace that sensor.
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Old 11-14-2020, 06:22 PM   #9
Mulder
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If the car is in test mode that may be why the code is being set. Is the CEL steady or flashing? If it's flashing with the key in "run" with the engine off that's definitely test mode. Normal codes will set a steady CEL with the engine running, unless it's an active misfire in which case it will flash (but only when running). And, a code being set won't make all those things cycle. Don't run out and buy any parts just yet.
Either there are in fact green connectors that got plugged together (sometimes installers do this when they see them hanging and assume they should be plugged in), or the installers did do something else that caused this. Get under the dash and look for those plugs (check both driver and passenger sides, not sure where they'd be on the '08 if they're there at all) and unplug them if they're connected. If you don't see them, or you do and they're not plugged in, pull the radio out and see what happens. If all this is beyond your abilities get someone to do these things or go back to the radio shop. It may be a coincidence but more than likely this is directly related to the last thing that was done to the car, which is that install.

Last edited by Mulder; 11-14-2020 at 06:29 PM.
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Old 11-15-2020, 09:59 AM   #10
Tunroe
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Default

Thanks for the replies

The check engine light is FLASHING. Looks like I need to locate those test plugs. Haven't been able to find any on the driver's side, with a cursory look. Have yet to look for the single wire ones on the passenger side.

The car was running great when I brought it back from the install. That said, the further I drove, the more things started to freak me out.
CEL started flashing faster. Cruise control light, selectable diff. and traction control light also started flashing. Cruise control ceased to work.
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Old 11-15-2020, 10:32 AM   #11
Tunroe
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Default Success!!

Big thanks to Elbert Bass and Mulder. I knew i came to the right place.
Just went to my garage and checked under carpet on pass side. 2 wire, green plugs connected.
Unplugged them, turned the key on, everything back to normal. No CEL. No relays or fans cycling. Hooked up code reader. No codes found.
AWESOME!!!
And, i have a fancy new updated sound system to boot.
Gonna pass this info on to the installer, so, hopefully the next guy won't go through what I did.
Thanks again, guys. Uve made my weekend.
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Old 11-15-2020, 10:41 AM   #12
bicycle_wreck
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As far as the test mode connectors, I found this: https://www.iwsti.com/threads/test-m...7/post-2235300

Sounds like they should be on the passenger's side behind the center console/carpet. Might be the easiest thing to check first.

To Mulder's excellent point about the radio, it does look like there are two CAN bus pins/wires on the radio harness (pins 11 [brown/yellow] and 12 [brown/green]).

http://ae64.com/20-pin-pinout.htm

These should not be wired to anything on the aftermarket head unit. If they used a harness adapter, it should be pretty easy to tell if they did or not and simple to fix. If they cut the factory harness and hard wired the head unit, it would be a little trickier, but still correctable.

And as Mulder also said, a good first step to figuring out if that's the problem would be to pull the radio and disconnect it. You might have to disconnect the battery afterward to clear the ECU memory.

EDIT: never mind, looks like you found the problem. Glad it worked out.
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Old 11-15-2020, 12:55 PM   #13
Elbert Bass
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Quote:
Originally Posted by Tunroe View Post
Big thanks to Elbert Bass and Mulder. I knew i came to the right place.
Just went to my garage and checked under carpet on pass side. 2 wire, green plugs connected.
Unplugged them, turned the key on, everything back to normal. No CEL. No relays or fans cycling. Hooked up code reader. No codes found.
AWESOME!!!
And, i have a fancy new updated sound system to boot.
Gonna pass this info on to the installer, so, hopefully the next guy won't go through what I did.
Thanks again, guys. Uve made my weekend.
Not a problem. Made my weekend it was a simple fix.
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Old 11-15-2020, 01:28 PM   #14
Mulder
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Happy we could help, and glad you got it sorted.
Good luck getting this level of support on Facebook.
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Old 11-15-2020, 08:14 PM   #15
Tunroe
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Quote:
Originally Posted by bicycle_wreck View Post
As far as the test mode connectors, I found this: https://www.iwsti.com/threads/test-m...7/post-2235300

Sounds like they should be on the passenger's side behind the center console/carpet. Might be the easiest thing to check first.

To Mulder's excellent point about the radio, it does look like there are two CAN bus pins/wires on the radio harness (pins 11 [brown/yellow] and 12 [brown/green]).

http://ae64.com/20-pin-pinout.htm

These should not be wired to anything on the aftermarket head unit. If they used a harness adapter, it should be pretty easy to tell if they did or not and simple to fix. If they cut the factory harness and hard wired the head unit, it would be a little trickier, but still correctable.

And as Mulder also said, a good first step to figuring out if that's the problem would be to pull the radio and disconnect it. You might have to disconnect the battery afterward to clear the ECU memory.

EDIT: never mind, looks like you found the problem. Glad it worked out.
Bicycle wreck,
Thanks for the additional info.
Even though I straightened it all out, I'm storing your additional info on the wiring. Could be great info to have in the future.
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