andrewc Posted December 18, 2017 Share Posted December 18, 2017 1) Hi, my horn has stoped working. Horn works when supplied with 12v (purple/black) and 12v arrives at Fuse 10 fom the switch (purple/black). Supply lost somewhere between the horn switch/fuse 10 and the horn itself. I can't find the horn on the RAVE wiring diagram for this car but surprisingly the switch is shown on the Engine Immobilisation schematic. It feeds Fuse 10 then the alarm relay (R200). The horn is not shown. Any clues as to how the supply gets to the horn would be appreciated. 2. I have checked the alarm relay and it is fine but not as shown on the schematic. The schematic shows 87A connected to 87 internally, I do not believe this to be correct. I understood that if the relay has 87A it should be a changeover, normally made contact with 30 as the common. My relay doesn't have 87A but has 87B which is a double pole single throw relay with 30 as the common. I have had the vehicle for 14 years and never changed a relay and the horn worked until recently. Can anyone throw any light on this? 3) I checked the alarm function and it flashes the indicators but makes no sound. I do not have a sounder shown as D110 on the schematic but have a battery backed unit shown as D154. I assume this to be faulty. I did (long after having no horn, so unconnected) let the vehicle's battery go flat a few days ago and wondered how long it takes to charge the sounder battery. I not that the manual says it charges from the generator so presumably needs the ignition on to do so. I guess, if that is the case, it is to stop the vehicke battery being discharged by charging the sounder battery. Any info appreciated. Quote Link to comment Share on other sites More sharing options...
Mutley Posted December 20, 2017 Share Posted December 20, 2017 Had simular issue on my 300Tdi few years back.Took it to a car sparky turned out a bad/damaged wire at the back of near side wheel arch. They couldnt get to it so pushed a length of sleeveing over it and all was fine. Dont help much i know but thought I'd share 😉 Quote Link to comment Share on other sites More sharing options...
western Posted December 20, 2017 Share Posted December 20, 2017 also have a look at the wire as it goes into the left stalk, horn wire is inside the stalk & may have broken, mine did a few years ago, managed to extract the broken wire & fit a new piece to restore operation or it could be broken at the stalk base under the column surrounds Quote Link to comment Share on other sites More sharing options...
andrewc Posted January 4, 2018 Author Share Posted January 4, 2018 Thanks for the responses. Found dirty corroded contacts in the end. I also worked out where the "missing" horn should be on the wiring diagram. I believe it comes off A134 on the Engine Immobilisation circuit which I assume to be a splice in the loom. Strange Landrover never added it to the diagram. Quote Link to comment Share on other sites More sharing options...
dailysleaze Posted January 4, 2018 Share Posted January 4, 2018 I was intrigued by this. Looks like the horn is fed from fuse 2 through the horn switch or fuse 10 from the alarm. Fuse 2 doesn't show in the electric library that it includes the horn, but in the owners manual it does. The A134 splice then sends whichever positive to the horn. Red arrows to show positive flow: Quote Link to comment Share on other sites More sharing options...
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