Electrical issues
 

2004 Dodge ram 2500- This has been to the dealer twice and its getting so I can't afford it anymore! A while back the pdp was replaced and reprogrammed and I still have several issues that seem to be related. 1) wipers turn on for no reason with the switch off. Then the wipers just stop in any position and don't park. If my cruise is on and I turn on the wipers all hell breaks loose and the speedometer gets eratic and causes the truck to surge.

Sometimes after startup and pulling out on to the road all the lights on my 2/4 wheel switch monentaly light- 2 wheel drive/4 wheel lo/4 wheel hi/ neutral. All the lighst flash on for a few seconds and then go off. The book tells me if a position has an issue it will flash. The is no answer if all the light come on.

On start up the volmeter reads 12 volts, not 14. The interier light are dim and even reving the engine has no effect. After about a block the voltmeter read 14 plus and the lights are normal.

I could go on and on but I think you get the idea. dealer replaced the abs module at $900, 3 months later it was the $1100 pdp. The pdp was replaced because all my light started acting funny and the end result was no brake light and one right low beam on low and on hi one left hi beam. I'll try and be more clear but this electrical issue is not that easy to explain.

Just today I don't have any defrost. Seems like one of the mixing doors are stuck. i do have a bully dog programmer on it and go a code of p0032 ( h023 heater control circuit high) does me a lot of good because I don't know what check for this. I'll clean up this post in the next day or two after I have had some time to figure out what really going on. One thing is that it never seem to be the same.

short circuits
 

sounds like you need to find a good auto electric shop.Someone that will actually diagnose the problem before needlessly replacing items that do not need to be replaced. If you are having issues between the cruise control and wipers somewhere in those two circuits there is a problem.If the issue is a short in the pcm what is causing it? I have an open sensor ground
on my 98 1/2 2500 . I am bringing it in to the dodge dealer monday but will talk to the tech
before he works on it just to make sure he knows more than I already do ! Nothing worse than a parts changer.

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One other idea with auto electric techs usually start with vehicle history has truck been in an accident ? If no has truck had aftermarket electrical equipment added ? radios,navigation etc. sometimes a mistake is made in when something is added causing an imbalance in one or more circuits.

Im voting failed bcm. But i think i would start by verifying powers and grounds at the bcm. Would also look at the pids for the wipers and other affected circuits while the issue is occurring. If all the items (wiper motor and another affected component) share a ground its a good possibility that the ground is bad and would actually show voltage (over 100mV), causing your issues. I would consider finding someone with a lab scope, it will make a job like this much easier.

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My 04 3500 just started something similar. One day I go out ad it is dead. I jump it ok. It ran all day and showed good charging. The passenger side battery does nothing. I had the batteries load tested and replaced both ( just one showed bad). Both my low beams are out,my lamp light trouble lamp is on and the batteries only show charging at 10-12 volts. My passenger battery ( although new) won't turn over the truck.

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You mean PCM?

No, bcm-body control module

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Could be strictly coincidental, but, your HVAC doors are vacuum-actuated. If there's a loose or broken hose under the hood, that thing will default to "defrost". If it's stuck in some other position, it might just be electrical, and that gremlin will die when you fix the other stuff.

Thanks, Did not think we had one. Manual doesn't show one. I' ll check again.

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Thanks, I'll check it out this morning.

It may be called a front control module or a integrated power module. It serves the same function. All lighting is controlled via the module, wiper function is also controlled by it. Ive actually seen them cause communication failures.

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I'll have to check my repair record but I think it was the front control module that was replaced. What ever it was it had to be reprogrammed. There was a 50 amp fuse under it and the fuse was good but the wire to it was open. Thats when I took it to the dealer. For that problem I think I caused it by reading out the brake light bulb wiring and leaving the batteries connected. I disconnected one but forgot the second one.

Update:
I was looking up my wiring and the wipers, transfer case control module, and speed servo control are all on the same ground. G104 in the left front engine compartment. My book tell me where it is but also lists the ground and not being shown. I did find G103 so I'll look and see if I can find G104. Because this ground is related to all the circuits I'm having issues with I beginning to think its a ground problem. Once I hit a bump and the wipers turned on.

Check your ground circuit in mV anything over 100mV on a loaded (operating circuit) is to high. So i would put a volt meter at the wiper motor ground and turn them on and watch. You might set your meter on max/min to catch something quick.

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