Hello All!

I have a 1985 500 SEC. The rear window defroster is not working.

Diagnosis:

When I push the button on the center tower, the light comes on and I can hear the relay click under the driver side dash. The interior light does not dim. Does this mean I have power to the switch and in turn to the relay.

When I release my finger from the dash button, the button returns to the neutral position and the light goes out. Does this mean that the relay isn't "holding"? I suspect that the relay has a timer where it latches (holds) the circuit closed for 15 minutes or so before releasing.

I have tried holding the button in manually for a few minutes. The rear window does not defrost.

Anyone been there and done this?

Thanks for any suggestions.

Dave in Ontario, Canada. -5C and snowing.

on my 84 I was able to check to see if I was getting "power" at the rear window (using a meter) . YOu shoud be able to see the connection. If your good there then the window unit is probably bad, if you have no power to the elements then probably looking at short somewhere else in system.

If the circuit is not completed, the switch will return to the neutral position?

Has a similar problem on my 380SE