Red security light on dash and nothing else?

2002 DODGE RAM
165,000 MILES • 5.9L • V8 • 4WD • AUTOMATIC
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The red security light is on my dash. The truck runs fine but nothing on the dash works. Headlights are on all time switch doesn't respond. No brake lights, blinkers or hazards. Has a new front control module batt cables ignition switch fuse box. I'm at a loss.
Mar 28, 2025 at 6:58 PM
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Yep, I have seen this problem before, the instrument cluster needs to be replaced/rebuilt. The lighting system you have motioned go through the cluster. You can get a preprogrammed unit by searching Google or Ebay. Let us know how it goes.
Mar 29, 2025 at 4:30 PM
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The cluster can control all these different functions? And is there a way to test the cluster?
Mar 30, 2025 at 3:58 PM
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Sure, you can test the input and outputs of the cluster, here is a guide to help you and the wiring diagrams for the headlamps and exterior lights.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Check out the images (below). Please let us know what happens.
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Mar 31, 2025 at 12:03 PM
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Can you tell what the this black box on the back of the cluster is? When you go to buy a new one most don't come with this.
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Apr 4, 2025 at 3:10 PM
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STRAILER
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Good question, it looks like a cover, can you remove it?
Apr 5, 2025 at 10:43 AM
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Looked it up says it's for remote keyless entry... got a new cluster on the way.
Apr 5, 2025 at 11:06 AM
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Sounds good, let me know what happens and have a good weekend!!
Apr 5, 2025 at 11:52 AM
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Thank you. I wish I would have talked to you first! Sir you saved the day, it worked.
Apr 13, 2025 at 3:31 PM
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You are welcome, glad you could get it fixed, thanks for letting us know.
Apr 14, 2025 at 9:30 AM