Horn Wiring - Troubleshooting non working horn

[joshik]

I'm troubleshooting my horn as the horn does not work when pushing the horn pad on the steering wheel. I know the horn itself works because when the alarm goes off the horn goes off.

I am trying to read through the wiring diagram and all i can find is that the horn to the horn switch is a green/red wire and that it seems to be a switched ground.

Questions:
1. The yellow cables with the black and orange connectors are strictly for the airbags, right? Does that mean the ground wire that connects to the lower portion of the back of the airbag is for the horn?

2. Is there a way to test the horn with the airbag pad off? I'm am trying to find which wires to short to enable the horn. Would I just ground that black wire with the spade clip?

I'm trying to rule out the clock spring.

Everything else on the steering wheel works. Radio controls, no airbag lights, cruise control....

Thoughts?

 

[OopsIBrokeIt]

Alarm horn/chirp is a separate horn attached to the side of the engine bay.

Your actual horns are up front on the driver's side and you need to start by verifying they're getting power + do actually function.


Once you've verified good hardware and actually checked the system is/isn't sending the expected signal you can start diagnosing it properly.

 

[joshik]

Alarm horn/chirp is a separate horn attached to the side of the engine bay.

Your actual horns are up front on the driver's side and you need to start by verifying they're getting power + do actually function.


Once you've verified good hardware and actually checked the system is/isn't sending the expected signal you can start diagnosing it properly.

ok cool. Yeh, I've been reading that lately in my searching around. I will test the horns themselves first and check all the relays and fuses.

If that is all good, would grounding the ground wire from the clock spring make the horn go off?

 

[OopsIBrokeIt]

Not a clue on the wheel wiring.

Personally I'd do things in the order of use and/or odds of failure.

Test the horns to make sure they work. That's probably doable with just a couple loose wires and a 12v source like your battery.

If horns are good, stick a multimeter probe into the connector and have somebody hit the horn button for you. If that's no good, I'd check for wire damage or bad fuses.

If the wiring+fuses look good I'd see about testing the horn button independently? Maybe get a multimeter on the connector and see if pressing it closes the circuit? As long as you're not actually applying power and just checking continuity you probably won't set off the airbag lol.


Oh and random dumb idea, try turning the wheel to lock both ways and hitting the horn as you rotate. I've seen clockspring issues where the wheel position impacted function, like volume buttons not working after a left turn then coming back after turning right tightly enough.

 

[MrTom]

Be sure to check the little fuse box on the lower left side of the dash panel.
Door has the fuse locations indicated.
Check fuse and connection plugs .

 

[AuSeeker]

Check horn relay.

https://youtu.be/gD60aS9D1ys?si=PIoYXCoz0YlE3CkS