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1990 325i Convertible Rear Window Defroster

4220 Views 3 Replies 4 Participants Last post by  Nathan - Canada
My Defroster is not working on my 1990 325i Convertible. What are some possible causes?
It has a separate hard top, installed with 2 wires connected, dash switch light is only illuminated when head light switch is in middle position. Button goes out when pressed.
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Put an Ohm meter on the two lugs where the wires attach. Positive on one and negative on the other. You are checking to see if you have a break in the circuit of the defroster element. That may be why it wont work.
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