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Old 10-26-2005, 12:31 PM   #1
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Default Fan Override (Eliminates the CEL/SES problem)

Like many I performed the fan override on my 97 SSEi, only down side I noticed was the CEL would come on if I forgot to turn off the switch, turned off the car and restarted. The PCM checks the circuit and sees the grounding.

I thought about how to work around this problem of my forgetfulness.

Talking to friends I came up with a couple different possibilities.

1. Cut the wire from PCM to fan and put a diode inline. I'm not a fan of cutting factory wires.
2. Use a single relay, wiring to include a self latching and hooking the power to ignition. It would reset automatically when the car is turned off. Downside is you can't turn it off w/o turning the car off.
3. Using a momentary switch to turn the fans off and on. One push = on another push = off. There are two ways to follow this path, both involve a latching/unlatching circuit.

I chose #3, I want the ability to furn them off as well as on.

Gathered 6 relays and wired them per a website (I'll add link later) to put out a ground. Could have used 5 if I added two diodes, had plenty of relays sitting around after a junkyard trip. I have this together and it works great. I have an idea that I need to research further that would turn on a dash/cluster light when the fans were on.

I am going to build a circuit per another website that uses integrated circuitry to do the same. The only down side I see to this is electronics have a higher failure rate than relays. It'* not a high number though. Still need to gather the parts for this project.

I will be getting pics and links up soon, also want to gauge interest.
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Old 10-26-2005, 12:34 PM   #2
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well the CEL problem will be solved....Im wating to see the placement of the Button and the "light"
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Old 10-26-2005, 12:39 PM   #3
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there are plenty of spots in the factory gauge cluster to put a new "light" if all else fails use the "rear steer" light.
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Old 10-26-2005, 12:41 PM   #4
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Originally Posted by corvettecrazy
there are plenty of spots in the factory gauge cluster to put a new "light" if all else fails use the "rear steer" light.
It seems to be the only spot w/o having to molest the face. I discussed this w/Pat yesterday since he'* got a few clusters and faces laying around now. I may have to cut board traces that would power the light normally and tack a connector on, however it is very workable.
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Old 10-26-2005, 12:51 PM   #5
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Quote:
Originally Posted by BillBoost37
Quote:
Originally Posted by corvettecrazy
there are plenty of spots in the factory gauge cluster to put a new "light" if all else fails use the "rear steer" light.
It seems to be the only spot w/o having to molest the face. I discussed this w/Pat yesterday since he'* got a few clusters and faces laying around now. I may have to cut board traces that would power the light normally and tack a connector on, however it is very workable.
it would be a good joke item also.
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Old 10-28-2005, 11:24 PM   #6
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Here is the relay pack I made. It'* 6 in total and I've bench tested it. Works good.

I found a momentary switch, removed it from it'* previous home and added it into the seat switchpod. (Note: PACSWI hole right behind it)


Tomorrow the button and rest of switch pod will be painted the proper color.

I'm still tracking down the correct chip to make a IC version.
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Old 10-28-2005, 11:36 PM   #7
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GO Boosty go!

Kinda crowding that corner of the seat switch trim, no? Why not in the center?
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Old 10-28-2005, 11:46 PM   #8
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GO Boosty go!

Kinda crowding that corner of the seat switch trim, no? Why not in the center?
Because when my cupholder is out it has a support in the center. ps.. I need to paint something tomorrow...lol
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Old 10-28-2005, 11:52 PM   #9
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Ahhh. Good thinking. I would have just been swearing my butt off when the drink holder was clickin my switch.

Morning is better for me. Margaritas for breakfast?
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Old 10-29-2005, 10:25 AM   #10
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Quote:
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Morning is better for me. Margaritas for breakfast?
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