Help With Wiring Harness

[bilko0795]

As per title I need some info on the location of the D9 crimp within the wiring loom from the fuse box back showing a blue and red wire that powers the N71 N75 N 80 So if anyone has a spare loom they could check for me I would be most grateful.

Thanks in Advance.

[Error404]

D9 is not a crimp it's a reference to a joint inside the harness. All of these items are fed from fuse S27, what is the reason you ask?

[UrS4boy]

D9 is not a crimp it's a reference to a joint inside the harness. All of these items are fed from fuse S27, what is the reason you ask?

Error: Have you forgotten this thread?: http://www.s2forum.com/forum/showthr...ht=N75+N80+N71

S27 is not the N71, N75, N80 fuse. It is the ECU constant power fuse. The N71, N75, N80 fuse is S24. D9, as per the request, will be a copper ring crimp within the harness where a wire from the S24 is attached to the wires going to the N71, N75 and N80.

[Error404]

Says S27 in the factory ABY schematics - another error for the list

[Tonks4x4]

If you are getting a fault on all three items with "Open Circuit" or "Short to ground"
I would suggest replace the fuse with a new unit...

Believe it or not this is exactly the issue I had with my 3B until last night.

The fuse tested ok with a multimeter but for some odd reason would not pass power???
All I can guess is that the pins were corroded in some way but visually looked perfect.

This was the main reason I built a new engine and converted my coupe to ABY.
That fuse has a lot to answer for...

[Error404]

you only needed a small excuse

[UrS4boy]

Says S27 in the factory ABY schematics - another error for the list

Maybe so. Very strange. They had it correct with the 3B schematic and they also had it right for the ADU schematics. Everything Paul N. has on S2Central.net has S27 = ECU power.

S27 to Pin 18 on the ECU:



S24 on Trace [8] to Trace [50]



Trace [50] from [8] to the N71, N75 and N80 (With crimp (D9)) (BUT the D9 description text mentions the S27 fuse - which is what you said. So forget the text, look at the diagrams)

[bilko0795]

Reason I was asking my mate in work understands auto electrics more than I do And he was asking where it was located. My other problem now is the battery has decided to start going flat it has started since I have been checking the various fuses and plugs I feel like putting a bomb inside and setting the thing off.

[Error404]

Do a current drain test, very easy. Then you can trace the drain, normally a stereo or after market alarm.
Have you checked the fuse board for water damage? It could well be the problem is on one of the traces inside the fuse board

[bilko0795]

Do a current drain test, very easy. Then you can trace the drain, normally a stereo or after market alarm.
Have you checked the fuse board for water damage? It could well be the problem is on one of the traces inside the fuse board

I re- routed the stereo wire a few months back as it was draining the batt I also removed the alarm that was also causing problems and it's been ok since it's even been ok for the last 4 weeks while I have been on holiday. I have just changed the fuse that Brian suggested still no power to the plugs. I have been toying with the idea about checking the fuse board it's just plucking up the courage to do it. It looks easy enough to do only two nuts holding it on that I can see can't feel any around the back of it so will probably take the plunge on the w/end.

[UrS4boy]

Disconnect the battery before you mess with the fuse box.

[Error404]

There 4 bolts holding the fuse board surround to the chassis (2 front, two back), plus it has that same butyl tape as the rear light clusters around it so takes some persuading to get it off, its easy to break so be careful. BTW you can unclip and lift the actual fuse board out of the surround without removing it

Have you checked you have 12v at fuse S24? Have you checked continuity between S24 and the various items you have faults with and also continuity between them and the earth/chassis ground? This sniffs of something simple to me Ray

[bilko0795]

There 4 bolts holding the fuse board surround to the chassis (2 front, two back), plus it has that same butyl tape as the rear light clusters around it so takes some persuading to get it off, its easy to break so be careful. BTW you can unclip and lift the actual fuse board out of the surround without removing it

Have you checked you have 12v at fuse S24? Have you checked continuity between S24 and the various items you have faults with and also continuity between them and the earth/chassis ground? This sniffs of something simple to me Ray

Thanks for that Alex didn't know the fuse board came out like you say.

I have power at fuse S24 I have also checked for continuity and the meter is showing nothing witch my mate said is ok but not checked between them and chassis earth it has been running rough for a while that's why I spent £258 on a new ISV. I think you maybe right ref it's something simple as I have noticed on time water dripping on my right foot when it has been really piss-- g down. I think defo remove the fuse board and check for corrosion there must be a short somewhere as I'm also having issues with the bulb monitor one day it shows ok when you press the brake pedal and then go over a bump or even when I start the car next day it shows a bulb out I check the bulbs and all are ok. The car is really starting to p-- s me of now it hasn't been right since I have bought it but can't get rid as it owes me over £9,000 now or my wife thinks I'm but she said I must keep it. Another £2,000 I could have bought a B5 RS4

[sidrick]

You spent £258 on an ISV?

[Error404]

OK if you have power at S24 then I believe the fault must be downstream of the fuse board.
You now need to check you have continuity between S24 and N71 pin 1, N75 pin 1 and N 80 pin 2.
Then check continuity between N71 pin 2 and ECU pin 4, N75 pin 2 and ECU pin 33 and N80 pin 1 and ECU pin 5.
Also check the 2 pin connector for the N75 is not shorting out.

You should have continuity for all of the above connections