2003 lincoln navigator reverse sensor no longer working, is this a fuse? the sensor use to work when backing up, now it just stopped working.

Question edited for clarity.
Question moved to Yes, Model category.

It is one of the most complex electrical systems on a modern vehicle. You will only get the full wiring in a service manual or from a subscription with AllData. You can however usually bring up part wiring diagrams. The search query is

year make model (the part) wiring diagram

Fuse 32
https://fuse-box.info/lincoln/lincoln-navigator-2003-2006-fuses-and-relay
32 15 A* CMS, Transmission solenoids
https://www.google.com/search?q=2006+lincoln+navigator+wiring+diagram

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may be flasher relay, links which may help

(5) Navigator flasher relay replacement - YouTube

2003 Lincoln Navigator - Turn signal blinks just a few times (repairpal.com)

SOLVED: 04 navigator flasher relay location - Fixya

Fuse Box Diagram Lincoln Navigator (2003-2006) (fuse-box.info)

Condenser? What type of condenser? The AC condenser is in front of the radiator. Condensers don't have fuses, they are like a radiator for AC refrigerant gas to cool it, before going to the compressor.

Lincoln Navigator (2003-2006) fuses and relays - Fuse-Box.info

https://fuse-box.info > lincoln > lincoln-navigator-2003...

The Power distribution box is located under the right-hand side of the instrument panel. ... To remove the trim panel for access to the fusebox, pull the panel ...

2003-2006 Lincoln Navigator Fuse Box Diagram

https://knigaproavto.ru > shemy > 585-2003-2006-linc...

Jun. 21, 2018 - Fuse Box Diagram Lincoln Navigator (U228; 2002, 2003, 2004, 2005, 2006)

Condensers and Evaporators, no fuses, it is all to do with plumbing and liquid or gaseous gas.

https://www.ebay.com/b/Condensers-Evaporators-for-2003-for-Lincoln-Navigator/33547/bn_87489186

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Fix your car right away, by clicking the link https://www.reliable-store.com/products/lincoln-navigator-2003-2006-workshop-service-repair-manual-download

You're shifter indicator appears to need attention. The PRNDL = Park - Reverse = Neutral - Drive - Low
These are the gears. You need to have a high end electronic pc test and see what error code it is 'throwing'

check the switch with a meter it is located on the transmission

check to see if any of the bumper sensors are damaged also make sure the speaker is audible when put in reverse

yes it would cause the check engine light to come on.But just find the bleeper and remove it it want affect the cencer.The bleeper is separate from the censer..

The navi has leveling sensors on both axles that are switches and are adjustable. Most likely these are out of calibration. DO NOT attempt to move or adjust these with the vehicle on jack stands. Vehicle could shift and fall resulting in serious injury.

Here is a link to your owners manual, check section marked Roadside Emergence's (PAGE 257) for fuse box diagram.

http://www.motorcraftservice.com/pubs/content/~WO3NAV/~MUS~LEN/41/03navog3e.pdf