Do check the system voltage. It's easy and quick. If you have a faulty voltage regulator which can display any number of symptoms, it will disable the SRS. Eliminate the easy stuff first, then dig into seat belt connectors and the like with a multimeter. Your basic troubleshooting conundrum.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.