AAN starting issue

[marius555]

Yes , it is very strange , i have tried all the fuses but only in this combination the car starts . Tommorow morning i will follow the bk/green wire from the ECU and see where it goes .
I will keep you posted .

[newsh]

Do you have an aftermarket alarm?

[UrS4boy]

Yes , it is very strange , i have tried all the fuses but only in this combination the car starts . Tommorow morning i will follow the bk/green wire from the ECU and see where it goes . I will keep you posted .

The green/black wire from Pin 27 of the T55 ECU connector goes to the downstream side of that yellow fuse holder. That is not the mystery per se. The mystery is why you don't have switched 12 V coming into the yellow fuse holder on the black wire.

[pasbogdan]

He included fuse in wire tracking.But from fuse onwards it is not black green anymore.In the electric diagram 27 pin from ecu also"gets" at fiew relays and after that to "15".What is 15?
I do not know how a factory alarm works.It has one.
Pin 27 should get 12v when ignition is on.That can be direct from ignition swich or ignition swich could power a relay that will get 12v to ecu.The only relay described as "ignition" is nr 1 under steering wheel.He changed that and after that a feature that was dead started to work(beep with open dor and stationary lights on).It is hard to diagnose a car by phone.The thing that he should do is go with the wire.

[newsh]

"15", I think, is the 15Amp bus in the fuse box.

[Val]

newsh, you should read http://www.s2central.net/S2_Schemati...tic_Primer.pdf page #4 a couple of times before posting ^^^

[marius555]

Hello to all ,

I asked a friend who installs aftermarket alarm systems to come and see the car . He laughed because i've managed to burn the relay from the a.m. car alarm, and it was placed before the ignition switch. I have disconected the alarm's relay and everything is back to normal.

Many thanks to all of you who gave me advices . Also , i have to thank Bogdan for his time and calls.

Have a nice weekend !!!

[pasbogdan]

So the car had aftermarket alarm....

[UrS4boy]

I asked a friend who installs aftermarket alarm systems to come and see the car . He laughed because i've managed to burn the relay from the a.m. car alarm, and it was placed before the ignition switch. I have disconected the alarm's relay and everything is back to normal.

Lesson learned: Next time there is a strange C4 UrS AAN no start problem, the first question will be "Do you have an aftermarket alarm system?"

Second question will be "Is your aftermarket alarm system b*ggered?"

[UrS4boy]

newsh, you should read http://www.s2central.net/S2_Schemati...tic_Primer.pdf page #4 a couple of times before posting ^^^

To be fair, Marius's car is a C4 UrS6 not a B3 or B4.