I just performed this cooling fan mod:

http://users.oco.net/xero/fanmod/

I wired it exactly how it wanted, with the exception of where I pulled power from. I had to pull power from the 12V switched wire from my head unit because for some reason the 12V (+) wire from the cig lighter wouldn't light the LED's.

Anyways, now I have a SES light....it won't go away, even when I turn off and restart the vehicle. I don't have a scan tool, but I assume it's something to do with the fans.

The LED's I bought have built in resistors, so I wouldn't think that this would cause the SES to light. I can't figure out what it is...can anyone help me?

 

Do what I did - just !SES LIGHT!
No joke - my SES light was almost constantly on from my EGR so I !EGR and then a couple of weeks later !SES LIGHT...took care of my problems.

Unless you pay attention to it and actually get it scanned when it comes on (and I assume you don't, since you assume: "I don't have a scan tool, but I assume it's something to do with the fans."), it's really useless.

Now if you actually care what the SES Light tells you and you go and get your comp scanned everytime it throws a new code, then you might want to keep it. Otherwise - don't sweat it...the computer just don't like mods.

 

Sorry, IMO, getting rid of the SES lamp is just poor advice. Why would you render inoperative the best diagnostic tool your car comes with?

Since you don't have a scanner, clear your codes, don't manually operate your fans and see if the SES stays away. Then when you operate your fans with the switch, see if the SES comes on right away. If so, add the 47 ohm resistors in this diagram and that should take care of it.

 

Yeah I'd like to keep the SES light.

To clear the codes, will disconnecting the battery for 10 min do the trick? Or is there another way to do it?

Thanks for the help!

 

yeah disconnecting the battery will do the trick, but it is just easier to pull the pcm fuse instead. dont really need to do it for 10 mins, couple mins is more than enough. well from my experience anyway.

 

Just pull the "PCM BATT" fuse to reset the SES light, easier the disconnecting the battery. As always what Shoebox said is correct, worked for me.

 

Well, I DO have a code scanner at my disposal - and I just check from time to time to keep tabs on everything...it tells me a lot more than the light ever has. I do not at all consider the SES light the best diagnostic tool my car came with. Just MHO though.

 

I'm with Rob/Shoebox.... deleting the light makes no sense at all. There are ways to eliminate all "false" and modification-caused SES lights, and one more light on the dash isn't going to hurt anyone.... might even get their attention faster than a scanner that is set to a different function.

Also, bookmark Shoebox's website.... it has the answers to many of these questions.

 

To each his own. Curious, what do you consider to be the best diagnostic tool that came with your car, then?

 

The owners manual.

 

OK cool, thanks for all the help guys!!....

 

I cleared the codes by pulling the PCM BAT fuse. I started the car and bam the SES was still there. I didn't even have to turn the fans on.

I have another question. According to that diagram Rob posted above, it says I need 3 resistors...is this correct? Why do I need 3 of them? Also, don't resistors only allow current to flow in one direction? So does it matter which way I put the resistors in?

 

You need three because that is what you need. It does not matter which way they go. You are thinking of diodes that only allow current flow in one direction.

It is possible you did something else to cause the SES. Perhaps you want to get it scanned to see what it is about.

 

ok. I will go ahead and try that resistor installation and see if it works. I will have to stop by the GM dealership tomorrow and have them scan it to see what it is for sure.

Thanks for all the help.

 

Autozone will scan an OBD-II car for free. Just make sure you get the number of the code from them if you want to talk about it on the board.