24 replies to this topic

[Dave E]

I want to use my redundant front fog switch as a fan override. The fan should operate normally but I’d like to be able to run it after a session on track. If anyone has done this I’d appreciate any advise. Dave.

[slindborg]

do you run your scangauge when on track? if so give techieboy a shout as he programmed his to turn the fan on and off via the ECU (eg the proper way). saves knobbing about with relays and switches.

[Exmantaa]

You just have to make an extra switched ground on the fanrelais in the front. Easy and is discussed before.

[Zoobeef]

I have one. The fans are earth controlled by the ECU so when the ecu wants the fans on it just earths them. So all you need to do is splice in a wire to the fans earth, route it to a switch, then earth it. This means when the switch is off the ecu is in controll and when its on the fans are on. Also because its an earth theres no fear of the switch getting hot.

[Muttley]

My mates call mine the "Stevie Switch" Have always been paranoid about water temps in all my cars and my mates take the p*ss out of me for it. Duncan (I like gay music) VXR fitted one into the VXR, took about 10 minutes and works a treat. Stev

[Dave E]

do you run your scangauge when on track?

if so give techieboy a shout as he programmed his to turn the fan on and off via the ECU (eg the proper way). saves knobbing about with relays and switches.

Tried the code before but couldn't get it to work, think it only applies to the NA

Got the dash off at the moment so should be easy enough to route some wires.

[Dave E]

Sorry for being dense but any idea what wire to splice into. As the fans under the rad, it isn't apparent.

[Exmantaa]

http://www.vx220.org..... switch&st=20

You only have to find the right fan relay ground wire (normally switched to ground by ECU)
Splice in the extra cable for your switched ground and finito.

Edit:

Switching the grey and blue wire to ground however needs no fuse. You're simply manually doing what the ECU does and the live circuit will be running through the relay as designed.
Run a wire back from it to the cabin, connect to switch, connect other pin to a ground, not sure on grounding points in the dash, having not looked yet.

Edited by Exmantaa, 15 April 2010 - 01:45 PM.

[Dave E]

http://www.vx220.org..... switch&st=20

You only have to find the right fan relay ground wire (normally switched to ground by ECU)
Splice in the extra cable for your switched ground and finito.

Edit:

Switching the grey and blue wire to ground however needs no fuse. You're simply manually doing what the ECU does and the live circuit will be running through the relay as designed.
Run a wire back from it to the cabin, connect to switch, connect other pin to a ground, not sure on grounding points in the dash, having not looked yet.

Exxxcellent, exactly what I needed, cheers fella

Just to confirm, grounding the grey/blue doesn't interfere with the normal operation of the ecu?

[Harry0075]

Tried the code before but couldn't get it to work, think it only applies to the NA

have you got a link to the code or the code? I might try it if so, have a Scangauge and an NA

[techieboy]

Tried the code before but couldn't get it to work, think it only applies to the NA

have you got a link to the code or the code? I might try it if so, have a Scangauge and an NA

You need to program the turn-on and turn-off codes listed at the bottom of this page and assign them to a memory slot on the Scangauge. Works a treat.

[Exmantaa]

xxxcellent, exactly what I needed, cheers fella

Just to confirm, grounding the grey/blue doesn't interfere with the normal operation of the ecu?

No, The ECU switches this wire to ground to activate the relay. In case the ecu switches anyway while you grounded this wire by the extra switch, it simply will "ground an already grounded signal"

First do a trial for the right connection (simply stick a piece of wire in) before you start modding.

[Harry0075]

You need to program the turn-on and turn-off codes listed at the bottom of this page and assign them to a memory slot on the Scangauge. Works a treat.

techieboy, will give it a try

[Dave E]

xxxcellent, exactly what I needed, cheers fella

Just to confirm, grounding the grey/blue doesn't interfere with the normal operation of the ecu?

No, The ECU switches this wire to ground to activate the relay. In case the ecu switches anyway while you grounded this wire by the extra switch, it simply will "ground an already grounded signal"

First do a trial for the right connection (simply stick a piece of wire in) before you start modding.

[Duncan VXR]

Thanks Steve - you gimp Done loads of these and as stated mine is using my redundant fog light switch - only one I have had problems with is Harry's but think the fan or something else is at fault her good job its an n/a and takes 4 years to get that hot lol DG

[Dave E]

I must be doing something wrong. I've run a wire from the blue/grey terminal(see picture) straight to the battery earth, ignition on then engine on, any thoughts on why my fan aint doing it's thing.

[Exmantaa]

That should be the right wire... You should hear the relays clicking when you earth the blue/grey wire. Did you check voltages etc. with a multimeter? Black/brown should be +12V Black/green should go to your fan connector (check that connector also for ground at the other wire..) Blue/grey is the switched ground from ecu / override switch (you can just ground to a chassis point)

Edited by Exmantaa, 16 April 2010 - 11:02 AM.

[Vespa]

I must be doing something wrong. I've run a wire from the blue/grey terminal(see picture) straight to the battery earth, ignition on then engine on, any thoughts on why my fan aint doing it's thing.

stupid question... but are you sure the fan actually works under normal ecu operation? i.e does it come on when temps get high?

[Exmantaa]

A jumper from the thick Black/Brown wire to the Black/Green wire overrides the relays and should start the fan up...

Edited by Exmantaa, 16 April 2010 - 12:25 PM.

[chris_uk]

Quick question regarding the scangauge method when i programmed in the code to turn it on (Memory 1) and off (Memory 2) they worked fine.. but after turning the car off and back on the codes have gone and they dont do anything anymore. is this normal or should it save the info forever?