Well after spending the last week researching and pinning things out drawing up wiring diagrams and then ordering parts I finally yesterday went ahead and wired it all up and I'm happy to report it works perfectly.

Basically I wanted the spoiler to deploy when I unlock and the then to retract when I lock the car I originally thought it was going to be easy to achieve with a pair of self locking timer relays but the first problem I came up against was finding 2 switched 12V trigger sources one for locking and one for unlocking these are needed to trigger each timer relay separately to make it go up and down I thought I could find these at the locking pump in the boot but the system is CAN BUS so there's no 12v triggers, to get around this I had to buy a SPDT micro switch that I had to fit in the door that is fitted in such a way that when the door pin moves up it hits the little lever and switches the switch giving me the 2 12V triggers I needed problem solved.

The next problem I had is I was unable to feed 12v down each wire to the spoiler with it still attached to the BCM as it causes a dead short so I needed to isolate from the BCM circuit when I want to operate the spoiler remotely, to get around this I needed a DPDT relay this is able to switch between the 2 circuits using an ignition switched 12V feed this had another function because it isolates my relay circuit when the car is running so the door locks can be operated and it will have no effect on the spoiler.

Also using the DPDT relay it allows normal BCM function of the spoiler when the engine is running so the dash switch works as it should and if you manually put it down once started up then the speed activation/decativation still cuts in as it should.

Here's the parts I needed:

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With all my problems ironed out and all the parts here I set about starting with what I thought could be difficult to sort and that was installing the micro switch but once I got the door card off it became obvious it was going to be easy as I could see a moving part of the door latch that was perfect to use to switch the micro switch and all I had to do was to fabricate a bracket to hold it in place, all in all it took about 20 mins to hook it all up and rivet the bracket in place.

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Ignore the gaffer tape everything is secured correctly I've just taped everything to ensure there's no rattling:

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Once the switch was all sorted and tested I refitted the door card and set about the complex wiring process under the bonnet, fortunately it can all be wired in inside the control box where the BCM is stored:

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As I had to draw up multiple wiring diagrams it's not pretty but it gives you an idea of exactly how it's done (if interested I can draw up a better one if wanted) I will say I haven't put the in line 10A fuse in the main 12V feed which is needed for safety:

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All done and wired up and tested before hooking up to BCM and spoiler as you really dont want to be feeding power where you shouldn't be as that could be an expensive mistake anyway it was all working as it should so hooked it up to the the spoiler and BCM:

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Finally all stored away in the control box along with the BCM:

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It was to dark once finished to make a few videos so I've just been out and made a few this morning of the finished article:





Well that's it some will see it as pointless I'm sure as not everyone likes the spoiler up but I love it and that's why it's called customised as it stands out from the rest and as far as I can tell I'm running the only Crossfire in the world with remote activation of the active spoiler.

Thanks for looking and for the help those of you offered up when I was researching this modification.

Any questions fire away.

 

Very clever, thanks for sharing!

 

Nice work! You just made your Crossie unique!

 

That is pretty cool, I will have to re-read how you actually did it. I like the idea.

 

Thanks guys

As I said if there's any questions or if you'd like the links to all the parts I used let me know.

 

This is excellent, dpbayly! If you could fire up the links to the parts you used I'd love to try replicate your project! Happy New Year, and thanks for documenting the process!

 

No problem,

here's the links to the components:

DPDT Relay from maplins:

10A DPDT Miniature Relay 12Vdc | Maplin

SPDT Micro switch from maplins:

Miniature Microswitch with Roller | Maplin

And finally you will need 2 of these Self locking timer relays from ebay:

Multifunction Self-lock Relay Cycle Timer Module PLC Home Automation Delay 12V | eBay

You will also want:

10A spade fuse
a pack of female insulated spade terminals Blue
a pack of female insulated spade terminals Red
wire several colours (makes it easier to keep track of what goes where with more colours)
a piece of steel to make the bracket for the door switch

That's everything.

The timed relays don't come with instructions but there simple to set up you hold down the set button then alter the mode to 0001 then then the T1 to 008 seconds for the down relay and 006 for the up relay then T2 on both to 0000 and then hold the set button again this will then activate the relay for the 8 or 6 seconds then its ready to go if you tap the set button again it turns off the timer display but still functions as normal, once set up the timed relays never need touching again even if you disconnect them as they keep the memory.

If you need any help at all drop me a PM I'll happily talk you through anything.

 

dpbayly Great write up! Thanks for the guide.

Your car is a real credit to you.

 

You're a gent, thanks very much! No doubt I'll be in touch looking for a fix when I fry something

 

Car looks real sharp, you are very talented and thanks for sharing.

 

Sorry to bring up an old thread, I have purchased a spoiler and going to install it on a different car. Do you happen to know how that would get wired just to make it go up and down with a switch only. All the threads I find are trying to make it go up and down at different speeds, im looking for super basic, just to get started and not blow up the motor.
Thank you for any help, I have searched a ton, and am just not finding it.