2003 chevy blazer security light on and won't start

Asked by Guru9Q5YV Jul 08, 2017 at 08:22 AM about the 2003 Chevrolet Blazer LS 4-Door 4WD

Question type: Maintenance & Repair

Car tries to start, but the security light comes on and it won't start.  Can I
disconnect the passcode somehow?  

2 Answers
510

lord00 answered 7 years ago

the security light indicate an error with the NATS communication line and you will need to diagonise it to.know what.exactly is wrong.with.the car.

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130

Jim answered 5 years ago

I had this problem. After trying every trick in the book. The Chevy dealer said I needed a new Body Control Module. In the 2500 Silverado there is a fusebox under the hood on top of the left front fender. The fuse was marked TBC and was the closest to the fender in the back corner toward the firewall. Mine is a little 10 amp fuse. Hope it helps.

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