horn wiring

Post Fri Mar 28, 2014 11:03 pm

my horn is about the only thing thats not working, where does it connect to on the loom ? is the bit on the loom that just connects to the horn ? can anyone tell me what im looking for and to go about this please

thanks

Post Fri Mar 28, 2014 11:14 pm

First thing to do is to listen to relay K2 in the fusebox while someone presses the horn button with the ignition on.
Does it click?

Post Fri Mar 28, 2014 11:19 pm

thanks brian, il have a look tomorrow , im presuming so as it always worked before , but i know the actual horn isnt connected at the moment , so im hoping it just needs connecting, which is where/how please ? , and what to do if its not/cant find it there ?

Post Fri Mar 28, 2014 11:26 pm

Where and how depends on the spec. of your car. It will either have a single horn mounted behind the top of the kidney grill with two single spade connectors on wires connected to it, or it will have two horns, one each side, mounted BELOW the panels below the headlamps. These horns will have two pin plugs of a similar style to those connecting the headlamps, washer pump, etc.

Post Fri Mar 28, 2014 11:37 pm

Yes I've got the 2 under head lamp ones thanks il check for the connectors tomrrow I can't remember if I've got spare connectors there but must have, all the lights and indicators are working and still need to put the plastic panels in but il do that after the mot as the headlamps need adjusting and lining up still

Also need to fit the obc horn and air temp sensor and air ducts etc (tech 1) ,gonna try get it all done tomorrow

Post Fri Mar 28, 2014 11:45 pm

Another thing Brian - up by the fuse box I have 2 of the black L shaped push on connectors, (same as what go in them plugs for the lights/sensors) not very long wires , what are they for or are they spares or for something I don't have ?

Post Sat Mar 29, 2014 9:05 am

Just having a look now , the horn has 2 spade type connectors at the top about an inch apart , but no spare bits on loom , only soare things are the black push/pull connectors that have the line .|. Sort of thing in the middle , with a brown/green and grey/yellow wire ?

Post Sat Mar 29, 2014 12:47 pm

Local garage has looked at my none-working horn and advised there is an earth fault where it connects to the steering rack.....

Does that make sense to you Brian?

Post Sun Mar 30, 2014 7:03 pm

right i found the 2 spade connectors (1 for each horn) the relay is clicking , so just need to get them working, how do they earth ? do i connect an earth cable with a spade connector to the other socket ? then where do i earth it ?

1 of my horns, 1 of the connector spades is totaly rusted away

Post Sun Mar 30, 2014 8:15 pm

baur320 wrote:Local garage has looked at my none-working horn and advised there is an earth fault where it connects to the steering rack.....

Does that make sense to you Brian?

Horn switch eventually earths through the lower steering column, and dirt builds up on the balls insulating the column.
The test is to rotate the steering wheel while keeping the button pressed.
A good squirt of switch cleaner up the column from under the bonnet, followed by some spray grease will sort it.

Post Sun Mar 30, 2014 8:17 pm

Horns themselves connect to earth at a stud on the LH inner wing, below the headlamps.

Post Sun Mar 30, 2014 9:41 pm

ok thanks brian i know the stud, does that mean i have to run a wire right across from the RH horn ? is there no easier way nearer that horn ?

to be clear..i just need to make a wire, with a flat hoop connector on one end, and a spade connector on the other , and go from that stud to the other terminal on the horn, correct ?

Post Sun Mar 30, 2014 10:15 pm

What's wrong with the wire that's there already?

Post Mon Mar 31, 2014 12:49 am

The only wires I have - is 1 wire to each horn from the loom with 1 spade connector in the rubber cover , which I presume is the live, no other wires, and each horn has 2 terminals- so I presume I need the wire in the negative/earth wire to each horn ?

Post Mon Mar 31, 2014 10:12 am

This must be pre face lift stuff? I'm not over familiar with the finer details of their wiring, but if there's only one wire, then I presume it was intended to be used with single terminal horns that earth through their own mounting brackets.
If you have single terminal wiring and two wire horns, then a short wire from the neg. terminal to a ring terminal under the fixing nut would do the job.