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Originally Posted by jrmoen
What would cause the car to die when this comes on?
Why would the RD light come on with the fuse pulled or come on by itself at all?
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THe fuse will not disconnect the RWD: it just disconnects the feed to the button. This button trigs a relay and the power feed to the relay is through a separate circuit breaker. ALso, the feed to this button is on same circuit as ignition.
The "RWD relay" is in fact a solid state timer and an electromechanical relay packed together. I think this unit (located in the "convenience center" probably under the glove box...not sure for this model) is the culprit, and possibbly has an internal short that sends erratic commands to the relay and that shorts the ignition circuit at same time. I'm just surprised the fuse does not blow out!
I'd pull the RWD relay off and see what's next.
THis circuit is "typical" of pontiac.
www.avigex.ca/xport/reardefogger.jpg