No horn. Help
Record Breaker
Joined: Feb 2011
Posts: 2,256
Likes: 2
From: SoCal
C7 is a connector/plug on the bottom of the IPM. You have to remove the IPM then turn it upside down to see it. With it held upside down and with the FCM end closest to you, connector/plug C7 is at the lower left and is colored black when the wire harness connector is disconnected. ( all according to the diagram link)
joex statement -"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"
You may be confused because joex only tells us the connector number (C7) and doesn't tell us the contact/pin number or the wire he spliced at the connector. Going by his description of "horn wire at C7" that would have to be the wire connected to contact/pin 19 on connector C7. That wire color is dark green with a violet stripe.
If you try joex's fix you will be splicing a wire to that dark green wire on the wire harness connector you disconnected from C7 on the IPM
In reality all joex did was bypass the FCM. Instead of letting the FCM ground the relay coil he provides an external ground to bypass it. That would lead me to believe the FCM was bad. Could be but could also be a poor connection between the FCM and IPM or something internal to the IPM. As I said previously, you may want to remove the FCM and inspect that connection.
MANY EDITS
joex statement -"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"
You may be confused because joex only tells us the connector number (C7) and doesn't tell us the contact/pin number or the wire he spliced at the connector. Going by his description of "horn wire at C7" that would have to be the wire connected to contact/pin 19 on connector C7. That wire color is dark green with a violet stripe.
If you try joex's fix you will be splicing a wire to that dark green wire on the wire harness connector you disconnected from C7 on the IPM
In reality all joex did was bypass the FCM. Instead of letting the FCM ground the relay coil he provides an external ground to bypass it. That would lead me to believe the FCM was bad. Could be but could also be a poor connection between the FCM and IPM or something internal to the IPM. As I said previously, you may want to remove the FCM and inspect that connection.
MANY EDITS
Last edited by Cougar41; Aug 14, 2014 at 03:27 PM.
Registered User
Joined: Aug 2014
Posts: 9
Likes: 0
Thanks for all the help Cougar41.
I jumpered pin 19 of connector C7 to pin 85 of the horn relay. Horn is working fine.
In doing all this I didn't remove the FCM from the IPM but maybe a good idea to see if there is corrosion.
Thanks again.
I jumpered pin 19 of connector C7 to pin 85 of the horn relay. Horn is working fine.
In doing all this I didn't remove the FCM from the IPM but maybe a good idea to see if there is corrosion.
Thanks again.
Record Breaker
Joined: Feb 2011
Posts: 2,256
Likes: 2
From: SoCal
Well it's working. That's the important thing. Makes you wonder why in the H Chrysler routed it through the FCM in the first place. Anyway, if the FCM connection looks good maybe some day you can get an FCM from a salvage yard and try it. Happy to help and hey, nice work. Any chance you could post some pics of it so others have a better idea of how to make the fix?
Last edited by Cougar41; Aug 15, 2014 at 07:57 PM.
Registered User
Joined: Aug 2014
Posts: 9
Likes: 0
Hey Cougar41,
Again, thanks for the help. I expect more problems with the IPM and/or FCM as time goes on.
I will remove the FCM to see if there are any corrosive pins or bad spots.
Regarding pics, I'm not much of a picture person. Never come out right and I don't have a good camera. Sorry.
I hope this thread helps other.
Again, thanks for the help. I expect more problems with the IPM and/or FCM as time goes on.
I will remove the FCM to see if there are any corrosive pins or bad spots.
Regarding pics, I'm not much of a picture person. Never come out right and I don't have a good camera. Sorry.
I hope this thread helps other.
Veteran
Joined: May 2013
Posts: 256
Likes: 5
Ho yea, most definitely 
Living out in the sticks, I literally never use the horn - don't even remember when the last time was. But the van is up for inspection this month, so I went through the checklist of items to be inspected. Everything good, until - no horn. When I jumped 86 and 87 the horn sounded, so at that point I'm thinking clockspring - ugh.
Then, as for any undiagnosed problem, I searched the forums and came upon this extremely helpful thread (one which for whatever reason I hadn't noticed before). Although I'm well aware of the numerous problems with corrosion in the IPM being posted on the forums, I've never had any problem related to it, so I've never messed around in there. But this thread looked to be dead on, so I removed the battery (with the typical badly rusted bolts to dremel out), and then spliced in the jumper wire from connector C7/pin 19 to horn relay pin 85. Buttoned it back up, and just like for the other guys, the horn lives to blow one more (inspection) day!
Just a couple of things to add from my turn at this. First, I did remove and check connector C7, and there was no visible corrosion. In fact no corrosion anywhere in the IPM (that I could see on the outside). Just a fairly good sized field mouse nest that's now history. Second, I had also read someone else's suggestion of disconnecting the battery, pulling the horn relay, reconnecting the battery, and finally reinstalling the horn relay (they believed it "reset" something). That was an easy enough thing to try, but did not correct this problem.
So here's many thanks to the 3 folks who posted on this thread and shared all of their findings. I probably would have blundered on a solution eventually, but this thread had it all wrapped up in a single package and certainly saved me hours of stumbling around. As so many times before, the forums come through again!
THANK YOU
Living out in the sticks, I literally never use the horn - don't even remember when the last time was. But the van is up for inspection this month, so I went through the checklist of items to be inspected. Everything good, until - no horn. When I jumped 86 and 87 the horn sounded, so at that point I'm thinking clockspring - ugh.
Then, as for any undiagnosed problem, I searched the forums and came upon this extremely helpful thread (one which for whatever reason I hadn't noticed before). Although I'm well aware of the numerous problems with corrosion in the IPM being posted on the forums, I've never had any problem related to it, so I've never messed around in there. But this thread looked to be dead on, so I removed the battery (with the typical badly rusted bolts to dremel out), and then spliced in the jumper wire from connector C7/pin 19 to horn relay pin 85. Buttoned it back up, and just like for the other guys, the horn lives to blow one more (inspection) day!
Just a couple of things to add from my turn at this. First, I did remove and check connector C7, and there was no visible corrosion. In fact no corrosion anywhere in the IPM (that I could see on the outside). Just a fairly good sized field mouse nest that's now history. Second, I had also read someone else's suggestion of disconnecting the battery, pulling the horn relay, reconnecting the battery, and finally reinstalling the horn relay (they believed it "reset" something). That was an easy enough thing to try, but did not correct this problem.
So here's many thanks to the 3 folks who posted on this thread and shared all of their findings. I probably would have blundered on a solution eventually, but this thread had it all wrapped up in a single package and certainly saved me hours of stumbling around. As so many times before, the forums come through again!
THANK YOU
