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Used Cars for sale - Used Trucks for sale [3798658259] Buy Used Cars

IOD fuse draining battery

- Dodge-Grand Caravan

Forum Post
03/16/09 13:32

IOD fuse draining battery

The IOD fuse in my Grand Caravan is slowly draining my battery. Every so often the battery is dead and I have to jump it but then it's fine for a day or two. I have no idea where to start looking for the origin of the problem. Can anyone give me any ideas where to start?
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This post has a total of 8 replies. Your feedback, comments, opinions and questions are welcome and encouraged.

This forum post has messages dated from 03/16/09 through 09/26/11, please be sure to read all the messages. If you feel it is old or outdated, please follow up with a question or comment and someone may be able to update it, or reply with newer information if you have it.

05/01/09 15:51

how do you know its the iod fuse?

my battery has died 3 times since purchasing my 2005 GC seven months ago. wonder if we have the same problem?

05/12/09 11:48
Jeff Briggs

I am an ASE Certified Mechanic and have ran into this problem more than once. The IOD fuse (Ignition off draw)on the vehicle I'm working on now only lowers the draw from 18ma to 8ma. Both are well within the spec of 50ma. Still, if the van sits for more than a couple days, the battery goes dead. I've read that some vehicles have been fixed by replacing the Front Control Module. I can't verify that is the problem but should be considered.The IOD, from the way I understand it, can take up to an hour to shut down all that can drain a battery. I think it is an intermittant problem with the IOD.
01/08/10 16:52
Johnny Angel

I installed a new Battery last year. Last week we found the battery to weak to start our 2005 Dodge Grand Caravan. All of the lights worked, but it just made a fast clicking sound when the ignition was turned. I removed the battery and put it on a charger for 3 hours at 40 amps. I tested the battery and it was good. I reinstalled the battery and the van started immediately. Each morning we found the battery weak and we had to jump start it. I disconnected the negative cable and ran a test light from the cable to the negative terminal and found that I had a 12 volt draw with the ignition in the off position. I pulled the IOD fuse and the test light went off. I know the IOD controls at least the door locks and the radio, television with DVD. I'm at a sticking point. Does anyone have any suggestions? What else is on the IOD fuse?



01/12/10 10:03

The IOD fuse(#28) in my 98 Caravan is slowly draining my battery.

I took it out (#28)and C relay. My van was running fine. But the problem should be BCM at the bottom left side fuse location. (Driver Side)I will fix it late.

11/11/10 15:28

the battrey in my grand caravan 89 is dead and the altanater is good and putting out 90 amps i dont know what else to try any ideas?
01/01/11 22:22

When will Dodge engineers smarten up and put separate fuses on each thing that draws through the IOD fuse? As time has passed the size of the IOD fuse has increased to the point where for some vehicles it must handle 90 amps. Everything that needs power (even standby power) when the ignition is off goes through it. This includes every open and close door module, electric seats, sliding door openers, window open and close motors (so you can remotely open the windows to cool off the car before you get in), gps equipment, clock, remote key receiver, remote engine start module and heater fan on warm engine detect, security system and alert (which includes lights and horns), and much more. Right now the only way to fix such problems is to cut all wires coming off the IOD in inserting a shunt with a place for a fuse. After turning off the car remove the fuse bypass on the shunt and watch. Eventually, a fuse will blow. That tells you the culprit causing the battery drain. In some cases it has been shown to be a open door module that is shorting internally. At other times it can be wiring. Regardless, it all comes to lousy engineers at Dodge. The problem has existed in every Dodge and many Chryslers since the early 90's and will continue to be more of a problem as vehicle electronics increase.
05/08/11 07:42

09/26/11 21:42
Thank author of this post/comment"IOD fuses killing battery ??"

We have a 2009 PT Cruiser with the 2.4L auto trans. It has 61, 000 kms on it. Car was not starting just after the warranty was up @ 60, 000 kms - Go figure. So same as previous - had to boost to start. I am a heavy duty Mechanic trying to figure this out & to help others as well. Also, it sparks when the pos or neg cable attached back to battery. Alternator & starter/solenoid seem to function correctly. Test light hooked between neg post & cable lights up when doing a Parasitic draw test. The draw is lessened considerably when the double IOD fuse holder we have in our fuse box is disconnected. I am thinking I need to individualize the various circuits that feed off these fuses #7 & #8 - that are paired together. Someone have a schematic to share - need this to help everyone else also. thank you, John.
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    Dodge Grand Caravan 'IOD fuse draining battery'