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VEHICLE RELAYS Operation Diagnosis Find the horn relay an test the circuit !
Center rear of the engine compartment, below the RH maxifuse?® block
Horn Component Views in Horns
Left front of the passenger compartment, on the steering wheel
Do you know how to do electrical trouble shooting ?
Switch is in the steering wheel. The horn itself is in the engine compartment to one side of the radiator, between the radiator and front grill. Usually on the drivers side.
More likely to be the horn that is faulty as it is in a pretty hostile place with water and salt spray. Test it by putting a wire from the battery to the horn contact. The one to earth will cause a spark, the other one should make it sound.
You have all the informations to find your problem. jump a wire on connector X4 G1 tan wire to ground and check X1 E5 with a test light or multimeter to see if there is a output, you should have 12 volts. If you dont have any voltage the horn relay is defective. I check in the shop manual and the relay come with the underhood fuse block.
I believe it is the fourth relay from the left passenger side in the engine compartment against the firewall. I am assuming your horn intermittently goes off by itself. It's a interior heat related issue. The horn pad cover on the steering wheel has a membrane layer. It's basically a switch that has one wire that goes to the horn relay to activate the horn. The Buick GM logo embossed on this plastic cover is where I found it most sensitive to any light touch. Unhook the battery. If you carefully cut the right edge of the the steering wheel horn pad and carefully pry it out a little, it will fix this issue and still be able to use the horn. It's another GM defect. I hope this helps! Let me know.
I don't have a diagram, but if I understand what you're saying, there is a copper ring at the top of the steering column, visible before you install the steering wheel. The copper pin is connected to the horn button. The intent being that when you press the horn button, it completes the ground from the steering wheel through the horn button, through the pin, to the copper ring.
If this is correct, there should be no contact between the steering wheel and the copper ring other than the pin. Check to see if there may have been a spacer (washer, etc) below the steering wheel on the steering shaft that holds it just far enough away from the copper ring so that only the copper pin makes contact.
LOOK UNDER THE LOWER AIR DEFLECTOR FROM BELOW THE RADIATOR. IF YOU HOT WIRE CAR HORN AND IT WORKS.YOU HAVE TO REPLACE THE WHOLE AIRBAG IN STEERING WITH HORN CONTROL BUTTONS.YOU NEED TO DISABLE AIRBAG IN STEERING WHEEL WHEN REPLACING AIRBAG AND HORN CONTROL BUTTON PAD.JUST TURN OFF RADIO FIRST, THEN DISCONNECT REMOVE THE NEGATIVE BATTERY CABLE.WAIT 20 MINUTES BEFORE WORKING ON AIRBAG AND HORN PAD IN THE STEERING WHEEL.
I have or should say had same issue on 1996 cirrus quick fix just remove the HORN RELAY located on the left side of dash relay only controls horn. To really solve the issue at hand you must replace the clock spring on the steering wheel dis-arm air bag before messing with steering wheel to avoid activation of air bag disconnect battery for 10 min then its safe to fiddle with steering wheel safely. Chino S.G.V