Margarite Posted October 21, 2022 Share Posted October 21, 2022 Horn is not functioning. Please describe how to trouble shoot and repair. Would be helpful to get a wiring diagram. Please indicate part/s needed. Need detail directions on how to disassemble, repair and reassemble. Thank you! Quote Link to comment Share on other sites More sharing options...
Mark92131 Posted October 22, 2022 Share Posted October 22, 2022 Run a 2 wires from the positive side and negative battery terminals directly to the 2 connections on the horn(s) and see if honks. If yes, your horn is good, if no, replace the horn. Do you have 1 or 2? The horn power runs through a relay on the driver's side of the engine compartment near the battery. Most likely your ground at the horn button isn't triggering the relay. Here's a 6 fuse wiring diagram to get you started. Mark92131 Wiring_Diagrams_6 fuse 2002.pdf 1 Quote Link to comment Share on other sites More sharing options...
Margarite Posted October 22, 2022 Author Share Posted October 22, 2022 Thank you, Mark. Some time ago, I talked to the the parts manager at a dealer who knew a lot about 2002s. I told him about the horn not working, he sold me a horn contact carbon pin. If that needs to be replaced, how do I remove the cover on the steering wheel to access and remove the old pin and install the new one. Margarite Quote Link to comment Share on other sites More sharing options...
popovm Posted October 22, 2022 Share Posted October 22, 2022 My horn was "broken" when I bought my car. Turns out the horn buttons on the steering wheel were stuck and they had unhooked the horn. ha. Cleaned up the horn buttons so the moved freely and then hooked up the horn again and now I have the added weapon of horn noise when fighting Seattle traffic. I imagine your horn is connected but testing with 12 volts from the battery is a great first step. I believe you need to remove the steering wheel to replace a horn contact pin. Quote Link to comment Share on other sites More sharing options...
kiva667 Posted October 22, 2022 Share Posted October 22, 2022 10 hours ago, popovm said: now I have the added weapon of horn noise when fighting Seattle traffic. Here's a better way... 1 3 Quote Link to comment Share on other sites More sharing options...
thehackmechanic Posted October 22, 2022 Share Posted October 22, 2022 Odds are that either: The horn itself is bad The contact behind the steering wheel is bad The relay is bad or a connector has pulled off it If, when you hit the horn button, you hear the relay clicking, then the button and the relay are working, and the problem is likely the horn itself. These old horns DO go bad. As Mark said, you can test the horn directly by running a pair of wires (positive and ground) directly to the battery. The horn contact behind the steering wheel has two parts--the little spring-loaded plunger that's part of the steering wheel (see Making Contact Is A Good Thing - BimmerLife BIMMERLIFE.COM A few years ago, I wrote a series of articles about the Turkey, a rusty, long-dead 1973 2002 that followed me home. Rust had eaten away not only the rockers, but also the mounting point for the right rear subframe bushing, so, absent a major bodywork commitment that the car didn’t... ) and the circular contact ring that's held in place by the steering column trim pieces. It's not unusual for the plastic holding the spring-loaded contact to crack with age and the little sprung plunger to pop out. You can usually see if it's there simply by looking in the gap behind the steering wheel (or its hub if it's an aftermarket wheel). You can pull the steering wheel off by pulling off the center pad with your fingernails or a plastic pry, then undoing the 19mm or 22mm nut in the center of the wheel. Regarding the relay, this article here ( Understanding Relays, part 3: Troubleshooting - Hagerty Media WWW.HAGERTY.COM Before we discuss troubleshooting relay-related wiring, let’s review. Last week we talked about the standard DIN numbers used on relays and the incredible utility they represent. In any circuit with a DIN relay, without looking at a wiring diagram, you know that: Terminal 86 supplies... ) details general relay troubleshooting. The relay should be fed 12V on pins 30 and 86. Hitting the horn button should complete the path from pin 85 to ground, which energizes the electromagnet in the relay, which pulls the switch closed, which connects the voltage on pin 30 to pin 87, which goes to the horn. 2 Quote Link to comment Share on other sites More sharing options...
Dick R Posted October 22, 2022 Share Posted October 22, 2022 The horns on my 71 didn’t work when I acquired it. Neither worked by trying a direct 12v power source, so the relay, nor the steering wheel didn't seem to be the problem. With nothing to lose, I took one of the horns apart and found that it was very easy to fix. It’s a pretty simple set up with a make and break set of contact “points” much like what you have in a distributor. In the horn, they make and break quickly enough to cause the vibration-producing sound. They were oxidized/burned so that they didn’t conduct any electricity. I filed them clean, put it back together and the horn worked just fine. Repeated the process on the other horn and that worked too. 1 Quote Link to comment Share on other sites More sharing options...
SydneyTii Posted October 22, 2022 Share Posted October 22, 2022 My horn had a corroded and broken contact at the back of the horn behind the grill, mines a 74. Have a feel at the back of the horn which you can reach from the space above the headlight and see if it’s still attached. Quote Link to comment Share on other sites More sharing options...
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