Close Trunk Lid With Remotes Or Door Button On A8

[jza8]

It really is simple

1. When pins 85 and 86 get 12v they close pins 30 and 87 (4pin relay)
2. When you press the remote button the green wire on the latch goes to 12v to open the latch.
3. Connect the green wire (12v) to 86 and brown (ground) to 85. Now pressing the remote button will activate the relay and close pins 30 and 87.
4. Now relay pins 30 and 87 should be connected to pins 2 and 3 (center 2 pins) of the close switch, as relay will short them when activated - same as the button does.

Have to do this myself when i find some time.

[ScottD3]

His description of the relay pins out and where the wires should go confused me but I understand what you put and it saves me from testing the cables and working it out myself.


I'm off to find some relays.

[onetwentie]

I recently was working with a similar 4 pin relay with my A8 (2007 D3). Specifically the relay that controls the air suspension compressor. So i've learnt how they work (or reminded myself of that which I had forgotten from school days).

This looks really interesting and cool!

Someone please shout up if they manage it? I have my boot liner removed as waiting for a replacement boot lid tail light (the old one managed to get a crack in it somehow!), so I'm tempted too!

[Delboy]

Seen this and thought its a nice little mod, but I think I will order plugs from Audi so it can just be plugged in and not splicing the harness.

Its not that I cant its i just don't like doing it if there is another way.

[jza8]

I would take the pins out of the plug and solder the wires to the pin directly. Not a fan of the splice connectors either.

[onetwentie]

Originally Posted by Delboy

Seen this and thought its a nice little mod, but I think I will order plugs from Audi so it can just be plugged in and not splicing the harness.

Its not that I cant its i just don't like doing it if there is another way.

Del, what do you mean when you say order plugs from Audi? am I missing something?

[Delboy]

well instead of using scotch locks hideous things.

I was thinking of buying the plugs to match the two locations so a small middle man harness could be made to allow the relay to be plugged in with out modifying any of the car wiring harness.

If you must splice wires in to a car harness they really ought to be soldered in to prevent problems in the future.

Connectors are quite cheap like a few quid each so I am doing some digging through the wiring diagrams at the mo to get a list of part numbers.

[onetwentie]

Ah okay, I think I follow now. In which case, kindly do post your findings as I would most definitely be interested in a clean way to do this!

[ScottD3]

I had ago at this yesterday and failed.

I was kind of rushing to do it between rain showers.

I've decided to do it via the switch. Mainly because I got the needed plugs and cable to do it.

I followed what jza said and connect the Green wire to 86, ground to 85.
This caused the boot to closed.
I used 2 and 3 from the switch plug.

Reading on he said pins 2 and 3 from the switch should go to 30 and 87.
So I put pins 1 and 4 to 86 and 85 and nothing happened.

I was wet and gave up.

I'll have another look later.