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Discussion Starter · #1 ·
Hi all, new to the forum and looking for some help.
I am having issues with my sub fan not coming on (right side). To give some background. After replacing a faulty main fan, a few months later the subfan failed to come on and I got a P0483 code. I checked the fan and it seemed to be ok, no blown fuses, relays seem to be ok, so in a pinch I hardwired it so that it comes on whenever the car is on. I just did a little more digging and it seems like the relay is not getting any voltage, however all other relays are (see relay in attached picture). Any ideas or things I could check next?

All else fails I was thinking of bridging the high voltage terminal on the main fan relay to the subfan relay and seeing if this solves my problem.
 

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'98 Outback
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249 Posts
What wiring diagram are you using? I have two for my '98 and they conflict on this circuit.

There should be another sub fan relay in the fuse/relay holder under the dash. (Apparently it's the main fan relay if you don't have A/C.) I'd look at that first. It looks like one of the sub fan relays works with engine coolant temp, the other with the A/C system.

Does the A/C work okay?
 

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(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
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if it gets too crazy tracking this down - you could rig the main fan to always be on when ignition is on.
 

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Discussion Starter · #4 ·
I am using this wiring diagram from the jdmfsm website.

The AC works fine. Thanks for the tip, I will check that relay out and update.

The sub fan is already hardwired to be on with the ignition, but this doesn't solve the check engine light and I can't pass emissions testing in CA with a check engine light.
 

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'98 Outback
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That's one of the diagrams I use. Look at Section Z, relay FB-2, which also shows up in Section A, where it's called both the main fain relay and sub fan relay 1. Like I said, conflicting. Good luck with it.
 

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(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
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it's a newer car, but I found this video;


evidently, the ecu is examining the fan ON signal and expecting a corresponding change in temperature from the ECT - so, could be a bad ect ?
 
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