Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hi. I assumed you would have mentioned it but I'm going to ask anyway because the symptoms go together, is your instrument cluster dead too? If it is working, do the gauges work normally? Do you get a temperature reading on the overhead console (if you have one)?
Ok. It sounds like you may have a dead fcm or an internal problem in the ipm, the fuse box that it bolts to. There are mulitple printed circuit boards in there and they're prone to corrosion that can open up circuits on the board. I got burned on one of these yesterday. I replaced an fcm and it ended up being the ipm. You might have a dead communication bus too, the network all the modules talk on.
On a hunch, go out and pull the connector off the abs module. its on the driver's side next to the fender, you can't miss it. Unplug it and see if the problem goes away. If not, pull the fcm off.
Look at the ipm where the fcm was. You'll notice the top row of pins are flat and the lower ones are all round. Counting from the top right pin on the ipm, this is pin 1. With the key on check for power at pins 3 and 4, 6 and 7. Let me know what you find for all of this. We may have to break out the voltmeter on this one.
Thanks, XXXXX XXXXX has me baffled. I will perform as instructed but unfortunately it will have to be later, possibly in the morning. Will you be available for discussion and my findings on Wednesday?
Oh sure. I'm at work during the day but I do get to check in a couple times. I'm on all evening. I'll look for your reply, and if I don't get back to you right away its because I'm at work, but I'll respond to you as quick as I can.
Ok. With all of this going on together I really think you have a bad fcm. You've got all the power feeds. This is best diagnosed with a scan tool but we can try and go as far as we can with a volt meter or test light and some jumper wires. the bad thing is I don't have access to wiring diagrams for your truck until morning. The closest thing I have is 2005 until I get back to work. I can round up the wiring info for you and get back to you with some tests tomorrow if that's ok.
I wish I had access to Alldata, I've been trying to get that set up for a few days. Finally got a call back tonight...
Make sure all your grounds to the fcm are ok. Pull it off and check right at the ipm to fcm connector. I think you'll find them ok. Put it back together. check the voltage on the PCI bus wire at the data link connector under the dash with the key on and see where its at. Unplug the fcm (turn key off to unplug it, then back on) and recheck the voltage to see if it comes up or goes down at all. Let me know what you see there.
You can power up all of your light circuits right from the fcm to ipm connector. Power up the ones that you can do-headlamps, turn signals, brake lights. You can also ground the pins that turn on the relays for the horn, wipers, etc with the key on and those things should run.
Let me know what you find for everything and we'll go from there.
Sounds great. Good luck!
I bought a FCM. Everything leads me there, as well. Have not installed yet. Do I have to take to dealer for VIN data input before unit will work correctly? I am not too knowledgeable on Dodge systems, VW is more my bag...Jimmy
The fcm is where I was leaning too but I didn't want to pull that trigger with your $220 without at least checking powers and grounds. The IPM's do give some trouble on these too, there are some corrosion problems on the circuit boards.
You don't have to do anything but screw the thing on. There is no programming or anything like that, screw it on and its ready to go. No scan tool necessary. Have the key turned off when you plug it in. Let me know how it goes...
Sounds great. I'll be tied up for a little bit here but it shouldn't be long and I'll be back for the rest of the evening.
Beautiful! Glad to hear it. Thank you for the accept, and thank you for using JustAnswer!