SwordMistress
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We have the Haynes repair manual (which is a sad shadow of having all the information you might be looking for in it). Does anyone have the wiring diagram for the horn?
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2008 Wiring Diagrams
- Thread starter SwordMistress
- Start date
The horn circuit should be fairly easy to diagnose without the diagram. What's going on with your horn?
If you absolutely need or want the diagram I suggest purchasing a subscription for your vehicle through ALLdata. It's probably the same cost as the Haynes manual and blows it out of the water in regard to information for your specific vehicle. You can purchase monthly or yearly subscriptions. I believe a month is only like $8 and well worth the cost.
I'm not positive with your car but most cars will have the horn switch connected to an input on the body control module. The BCM then controls the horn relay which powers the horn. It's pretty simple. It usually takes me more time to look up a schematic or diagram than it does to just troubleshoot the circuit. First pull the horn switch connector and also the BCM connector and see if you have continuity between the two. Next is the output of the BCM to the horn relay. You can also work backwards, find the horn relay and jump see if you have power on the switch side. If you don't have power then check the fuse. If you have power jump the switch side out with a jumper and see if the horn sounds. You can also test the control/coil side of the relay from the relay socket, one side of the coil should have power and the BCM usually grounds the other side to close the relay. If you have power to one side of the control/coil side then place your meter on the other side of the coil and push the horn switch, while the DVM is in continuity mode see if the other side grounds when pushing the switch. Rarely it's the other way around where the control/coil side of the relay has a constant ground and the BCM sends power to it to engage the relay.
If you absolutely need or want the diagram I suggest purchasing a subscription for your vehicle through ALLdata. It's probably the same cost as the Haynes manual and blows it out of the water in regard to information for your specific vehicle. You can purchase monthly or yearly subscriptions. I believe a month is only like $8 and well worth the cost.
I'm not positive with your car but most cars will have the horn switch connected to an input on the body control module. The BCM then controls the horn relay which powers the horn. It's pretty simple. It usually takes me more time to look up a schematic or diagram than it does to just troubleshoot the circuit. First pull the horn switch connector and also the BCM connector and see if you have continuity between the two. Next is the output of the BCM to the horn relay. You can also work backwards, find the horn relay and jump see if you have power on the switch side. If you don't have power then check the fuse. If you have power jump the switch side out with a jumper and see if the horn sounds. You can also test the control/coil side of the relay from the relay socket, one side of the coil should have power and the BCM usually grounds the other side to close the relay. If you have power to one side of the control/coil side then place your meter on the other side of the coil and push the horn switch, while the DVM is in continuity mode see if the other side grounds when pushing the switch. Rarely it's the other way around where the control/coil side of the relay has a constant ground and the BCM sends power to it to engage the relay.
SwordMistress
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I'll pass that info along to him. With some of the other intermittent issues we are starting to suspect the coil might be the issue...