Zero Voltage at the Rear Defroster - 2009 Expy

[R0am3r]

My 2009 Expedition XLT rear defroster no longer works. I checked the voltage at the plug to the heating strip on the rear window (with the engine running & rear defroster engaged) and it reads zero volts. The light to the rear defroster button works, but there is still zero volts at the rear window. I can't seem to find a wiring diagram of this Expedition model/version. I also have no idea which fuse to check. The owner's manual lacks to details on this issue. Can anyone help?

 

[Bedrck47]

Check fuse 51 and 52 in the under hood fuse block
also fuse 59 is for the heated mirrors.

Do you have automatic controls or manual controls for the heater/ac system

 

[R0am3r]

Thanks for the quick reply! When I looked in the manual at the block diagram for the fuses, I didn't realize what "Heated backlite/mirror relay" meant. So this is the rear defroster? I will check these fuses in the AM to see if this is the problem.

Please note that I have manual controls for the heater and A/C systems.

 

[Bedrck47]

Attached are the prints for both manual and auto controls

 

[R0am3r]

Thank you Bedrck47. The schematic helps me better understand the circuit and how this system works.

 

[Bedrck47]

Your welcome Let us know what you find