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Iod circuit problems

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6 years 5 months ago - 6 years 5 months ago #14990 by Ken.e.wilcox
Iod circuit problems was created by Ken.e.wilcox
I have a 2003 dodge ram 1500. 5.7l engine rwd.

I have no communication with the scan tool. Also, interior lighting, radio, door locks/Windows rke do not function when the key is off. They do function with the key one.

At the switches I have 5v ref with key on but not key off

Fuse 51 has power on both sides. Ground at pin 4 and 5 on dlc are good (test light connected to b+) no power on pin 16 ever.

Right now I am leaning towards a bad cluster but need to do more checks.

Anyone else have any idea on direction from here? (I have all data and diagrams available)
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Last edit: 6 years 5 months ago by Ken.e.wilcox. Reason: Adding information

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6 years 5 months ago #14991 by Chad
Replied by Chad on topic Iod circuit problems
Does the UNDERHOOD LAMP work?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)
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6 years 5 months ago #14992 by Ken.e.wilcox
Replied by Ken.e.wilcox on topic Iod circuit problems
My truck is not equipped with an underhood lamp.

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6 years 5 months ago #14993 by borntoroll
Replied by borntoroll on topic Iod circuit problems
Check if you have a short to ground from pin 16 of the DLC and if not just supply it with 12v through a lightbulb, a 12v 21watt one (it will supply 1.7A at max) or a 55 watt one (4.5 amps maxx) or a fuse. Why do you suspect instrument cluster?

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6 years 5 months ago #14994 by Ken.e.wilcox
Replied by Ken.e.wilcox on topic Iod circuit problems
Iod Fuse feeds to the cluster 1st then the radio and dlc. No problems with the clusters operation. That's why I suspect it. Maybe a inter 5am short or bad connector.

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6 years 5 months ago #14995 by borntoroll
Replied by borntoroll on topic Iod circuit problems
Electricity doesn't work this way. It supplies every module at the same time as diagram is showing.

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6 years 5 months ago #14999 by Chad
Replied by Chad on topic Iod circuit problems

Ken.e.wilcox wrote: No problems with the clusters operation.


Then, your problem is AFTER splice S204. But, it is not the cluster.
"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right. :-)

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