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Td5 horn won't stop.

PeterH

Shifting Up
Help!

The horn on my Td5 90 just started sounding continuously for no reason, the engine was off and the keys removed it doesn't have an alarm. After much fighting with fuses and relays i've discovered that if I remove a brown relay in the main fuse box marked sounder the horn stops (much to the happiness of my neighbours). as soon as I try to replace it it starts clicking like mad and sets the horn off again.

Whats happened? anyone else experienced this? how do I fix it?
With the relay out everything still seems to work including the horn using the stalk switch, do I need the relay? whats it do?
Any help much appreciated

Thanks.
Peter
 
Sounds like bad earthing to me; This often causes things to go a bit damn crazy for no reason. Or a short of course.. Have you done anything to the car recently?
 
You can usually tell if its a earthing problem because other things go strange too.. but I'd actually be more inclined to thinking it was a short somewhere as power is going to the horn for some reason. Either way it might be a good idea to disconnect the battery!
I guess you'd be able to tell because the battery would be going flat.

Hopefully someone who knows a bit more will be along soon to help me!
 
Sounder? Could that be the Alarm relay for the Horn?

If it works on the stalk, it's another system.

JONV8 is the Man to ask.

Chris
 
Hi,
Yes thats what I thought, it says sounder on the inside of the fuse cover. The horn works fine on the stalk, and everything else works ok with the relay removed I've checked all the horn and alarm fuses which are fitted. As far as I'm aware the vehicle has never had an alarm, its a 2001 and i'm the 2nd owner.

Thanks
 
Ah, I assumed it really wasn't the alarm, do you have a red light on the dash? (All this fancy TD5 stuff is new to me ;))
 
Hi, no I don't have a red light on the dash. A friend once told me that all Td5's were wired for an alarm but then only made operational if requested by option don't know if thats true?

Peter
 
Hi, no I don't have a red light on the dash. A friend once told me that all Td5's were wired for an alarm but then only made operational if requested by option don't know if thats true?

Peter
Yes it is.

Thats the relay for the alarm sounder [which uses the vehicles own horn]
If your vehicle has no alarm fitted, just remove it.
 
Brilliant, finally someone who knows what they're talking about! Problem solved!

But why...
God knows !
All controlled via the ecu, so could be a number of things causing it to "think" non exsistant alarm needs to sound ! :rolleyes:
 
Thanks for the help, is it as easy as leaving the relay disconnected? although everything seems to work ok will it cause any other problems?
Other than the ecu is there anything else I can check for faults?

Thanks
Peter.
 
Had the same problem before Cristmas - we were in the middle of a sleepy village at the end of a long days laning - caused a lot of curtain twictching:eek: - had to pull all the fuses to get it to stop. All now back apart from 10Amp fuse to bottom left in cab fuse box... I'd been going through loads of water that day so it must have been a short:eek:
 
Hi,

Just spent a cold afternoon with a test light. I have found that there is constant power on 2 terminals getting to the relay in question and therfore making it operate. I tried disconnecting numerous fuses but the power still remained also tried un plugging the ecu but still power.
I assume this is a short but i'm not very electrically minded any further thoughts on how to proceed
Thanks.
 
Brilliant, finally someone who knows what they're talking about! Problem solved!

But why...
Had the same problem albeit intermittently took it back to Guy Salmon and wait for it, apparently some of the alarms fitted have a setting known as 'terrorist mode', that they enter when it (the alarm thinks it has been interfered with) To fix it they just disconnected the battery and reset the ECU seemed to work (fingers crossed).
 
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