Originally Posted by
Brian P
I haven’t pulled the trigger on getting the cylinders rebuilt as we had some other things come up. I hope to pull them soon and I guess send them off and then buy a new top. The glass hasn’t fallen out, but, it’s probably just a matter of time. Thanks!
Brian, Find and make sure the fuse is not blown (check carefully). Then find the wires leading to the rear defroster grid at the rear window. Clip a voltmeter onto the two sides where the wires attach to the window and turn on the defroster. IF your getting the 12v, then your grid has an open. Come back here and tell us the results of this test. DON'T use any other testing point than the two places where the wires attach to the grid! A 'no voltage' would be helpful in moving on to another possible source to the issue.
The section in the service manual (8G in the 2008 manual), covers the rear defroster. By eliminating the fuse and the grid, you have to then delve into the central locking module, the Bode Control Module, or the actual switch on the A/C control head (with all associated wiring throughout). Testing the fuse and the grid is a start, beyond that the service manual has a step by step solution to find/fix the problem. Good luck!
.