I have a 06 Grand Caravan. The horn does not work at horn pad or panic button
I applied voltage directly to the horn and it blew. Fuse and relay are good.
Placed a wire from 86 to 87 at horn on the ICP and horn blew. I replaced the FCM without success. I looked under the ICP and nothing jumped out as looking bad. What would prevent control voltage from reaching the relay?
Any help will be appreciated.
Thanks

 

clock spring? correction typed fast.

 

Looking at a wiring digram the key fob signal is received by the BCM. The signal travels from the BCM to the FCM over the PCI data bus. The FCM supplies a ground to the horn relay coil completing a power circuit from the battery bus to the relay coil. The now powered relay pulls it's output contacts closed supplying power to the horns from the battery bus.

When you hit the horn pad the horn switch contacts close completing a circuit through the clock spring and on to the FCM. The FCM supplies a ground to the horn relay coil and so on.

Since the output side of the relay (you jumped the relay output contacts) is working you have a problem on the control side. Since it's not even working with the key fob I would say it's not a clockspring issue but the portion of the circuit that controls the ground output from the FCM. That is the common denominator between both modes - key fob and horn pad. You've changed the FCM. The major component left is the IPM. It's had a history of corrosion problems. If you're so inclined, take it apart and inspect the circuit boards for any sign of corrosion. If it's there change the IPM. Be sure to disconnect the negative battery cable first to prevent any module damage.

Sounds like your ICP (???) is my IPM - the fuse relay panel/box.

Course there's always the possibility you have a separate problem with your key fob or the BCM which makes much of this moot. Do you have a second fob?

 

Thanks. Ill keep digging and let everyone know how it turns out. Cougar41 I have 3 wire diagrams none of them are that detailed. Where did you find yours?
Again, Thanks.

 

After screwing around for awhile. I determined the problem was in the IPM. I took a wire and went from the horn wire at C7 and jumped it to pin 85 at the horn relay. Horn works so I'm happy.

 

Hello, I have the same problem. I bought a used 2002 Grand Caravan. The horn would work on and off. It worked with the remote key entry a couple times but now it doesn't. It also worked at the steering wheel but now doesn't.

I checked the fuse and it is good.
I checked the relay by removing a different one and putting it where the horn relay goes. Still no horn.

Can someone give me a little more info on where these pins are on the IPM or ICP?

I don't think it is a spring problem in the steering wheel because it did work at one time. I would like to check the pin 85 and C7.
Thanks in advance.

 

Hello Again,

I've been looking at this and made progress.
I did jumper 86 and 87 and the horn blew. Good.

Now I'd like to find where C7 is.
Can anyone tell me where? Is it under the IPM?
I need to take the FCM off first?

Thanks.

 

C7 is a connection on the bottom of the IPM (fuse box). Which one I don't know**. No need to remove the FCM first though you might want to anyway just to check it's connection to the IPM. It can corrode and cause problems. The FCM provides the ground to the horn relay coil. Before you disconnect/reconnect anything make sure the battery is disconnected. Want the wire diagram? I'll need an email address to send it to.

** Found this: http://ww2.justanswer.com/uploads/do..._CONN_VIEW.png

 

This is helpful to have more info on C7.
Using the link you sent, the diagram doesn't make sense to me. I don't see how it relates to the IPM. It doesn't seem to be the diagram of the IPM at the top view.
It says "Rear View". Is that the bottom view?
You say I don't need to remove the FCM. But then how do I expose C7?
I'll look at this diagram more.
thx.

 

Hello Again,

Looking at the diagram, from the link you sent - it looks like the blocks such as C7 C8 C3 and so on, are connectors not pins.

Is this correct? If so I'm comfused at what Joex said about jumping 87 to C7.
Still searching.