radio wires cut now alarm/cent lock not working

[sarahnic123]

hi all,

my brother offered to fit my new stereo in my car, cut the old wires from the old stereo and now the central locking and alarm wont work. he's fitted car stereos before and trusted him, but obviously there is a wire for the alarm/central locking that also goes to the radio wiring. can it be fixed? he's checked all the fuses and none seem to have blown. is there anything else he can check? luckily i can still lock my car with the key in the door. the light on my car key still flashes when pressed but nothing happens to the alarm/central locking.

hope someone can help before i kill him for messing it all up


thanks very much

sarah and a poorly alfa

x

[GialloEvo94]

I think it may just be an unfortunate coincidence. The remote locking and arming/disarming of the alarm is done by the remote receiver unit that is mounted in the roof (has two volumetric sensors in and is located just in front of the rear view mirror). The wires for that don't go anywhere near the stereo so I don't believe your brother has cut any wires for it by mistake.

The things you need to do first are:-

1. Do you have another remote key for your car? If so then check to see if that remotely operates the central locking and alarm.
2. Check whether or not the red LED on your remote key flashes at least twice per second when you hold the button in. If it does then the key itself is working correctly.
3. Press and hold the pen-tip button in that is on the bottom of the remote receiver unit and see if the green LED on the bottom of it flashes on and off while you're holding in that button. If it is does then the receiver unit itself is working correctly.
4. When pressing the button on the key, check to see if the green LED on the remote receiver unit comes on briefly. If it doesn't then the remote receiver unit isn't accepting the signal being transmitted by your remote key.

Report back with what you find for each of the above and we can then advise you further

[sarahnic123]

hi gaillo,

got it working, well the bloke over the road saw me messing with it and heard the alarm :/ he's wired my new radio up ok and there was a 25amp yellow fuse gone which hes changed. thank you so much for replying with help and info it was much appreciated and i'll have to keep upto speed with the events you post on here.

just a thought, the unit light is solid green and didnt flash even on re-set and my key fob led light only flashed once??? :/ not sure what it did before, genuinely can't remember, but its all working as it did before so i'm happy ..

thank you from a happy bunny

sarah n me little alfa

[GialloEvo94]

The red LED on some remote keys does only flash once and then go out but I've yet to discover why this is because the normal operation is that is should flash constantly at a rate of twice per second. The LED on one of my own keys flashes on and off when you hold the button in while on the other (spare) key it just flashes on once but both keys work the central locking and alarm absolutely fine.

If the red LED comes on and just stays lit with the button pressed then it indicates that the batteries are about to run out and need replacing. If the LED flashes at a slower rate of once per second then this indicates a faulty remote circuit inside the key.

The green LED on the remote receiver in the roof will come on solid green for about 1 second when you press the button on the remote if it's successfully receiving (and accepting) a signal from that remote. That green LED will only actually flash if you press and hold the pen-tip button in on the bottom of it. This isn't actually a reset button but is used to enter (tap in) the 4-digit code from one of your existing keys into the receiver unit in order to enable an additional key to be programmed in if you ever need to.

Anyway, I'm glad you got it all working in the end without too much fuss

[Loknar]

Maybe playing with the wires blew up a fuse? I did the exact same thing and got the exact same issue...

[drummer742]

hi
I have the same problem however no fuse blown there is no power to the radio,interior lights central locking getting a bit frustrated now anybody have any ideas i would be very grateful by the way my car is a 1999 145 2.0 ltr
look forward to hearing from someone
many thanks Russ Young