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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'90 Corvette, Air Bag Fuse

Q: I’m having to deal with a short of some kind that is located on the Air Bag circuit of my ‘90 Chevy Corvette. I have eliminated all air bag connections except the main one from the DERM. If this connection is not made , the car will not run. The car will start and you can drive it about a quarter mile and it will blow the air bag fuse. I think there’s something else on this circuit that is really causing the problem, but I do not have an electrical schematic that details the air bag fuse circuit. Anyway , when the fuse blows, the engine cuts out. I put a new fuse in and it starts up , I go a short distance and it blows another fuse. Hope you can help.

A: The Air Bag fuse on you vehicle just happens to be tied in with the vehicle’s engine computer and a relay or two. After reviewing the wiring diagrams for your Vette it was easy to see that GM did not intend to make it easy for someone to disable their vehicle’s Air Bag system. Here are a couple of items you should check for possible causes for fuse failure. The canister purge solenoid and the electric air pump relay; both units are powered by the Air Bag fuse. A shorted electrical winding in either unit would be cause for fuse failure. The Diagnostic Energy Reserve Module (DERM) which is the operational and in/during crash recorder for the Air Bag system is not known for ripping fuses but it is possible. There is an isolation/diagnostic procedure of all the systems that the Air Bag fuse powers. But they should be performed, by a technician that is knowledgeable. Why? Because if you jump the wrong wires, you’ll let the costly magic smoke out of the vehicle’s computer..

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