The rear defrost in my E36 only seems to work for the lower half of the window. Took off the pillar covers and see that on the driver's side there are two connections for the radio and one for the defrost. The Passenger side has a lead coming from the grid in the window, but it isn't connected to anything. I've searched all over, can't find anything to plug it into. Looked under the headliner (without complete removal) too.

Is this normal? Any idea where the connection has gone to or where it comes from?

I've got the Bentley... but ain't too good at deciphering the electrical diagram.