I have a lincoln ls and my horn dont work but all the fuses are fine, I bought this car from an individual but I need to get it inspected

it is the horn itself faulty.

Check the horn relay.

Put 12 volts to horn. If it works
then the horn button

There is a horn switch in the steering wheel,not the clock spring. Check that out Sounds as though you pressed the horn to get your readings. Unplug to horn and put 12v to it!!

Clock spring or the horn itself.

it is doubtful the horn fuse is the problem, it is more likely the clock spring contact under the steering wheel, the fuse for the horn is located in the underhood fuse box,
Fuse #4 15A* Horn

I may have a Ford Wiring Diagram Manual for $10 if you are interested, I will look and see if I have it.
The fuses are identified by individual circuits versus a layout of the entire panel on one page. I prefer the latter myself.

it may be your clock spring. if your fuses aren't blown try the clock spring. you can get the directions online and buy the part from the dealership. it takes maybe thirty minutes but saves you lots of money. another easy way to tell if it is the clock spring.....does your cruise control work? if not the clock spring is bad.

Principles of Operation
When the horn switch is depressed, a message is sent from the instrument cluster via the network communication link to the front electronic module (FEM). The FEM acknowledges the message and energizes the horn relay by grounding the horn relay coil which allows the dual note horn to sound.
Inspection and Verification
NOTE: The FEM and instrument cluster must be reconfigured upon replacement. Refer to Section 418-01 .

1. Verify the customer concern by operating the horn.

1. Visually inspect for obvious signs of mechanical and electrical damage.

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Visual Inspection Chart

MECHANICAL

Damaged horn

Damaged horn switch

Damaged horn relay

Damaged air bag sliding contact (14A664) C2

ELECTRICAL

• Battery junction box (BJB) Fuses:
  • 425 (40A)
  • 422 (20A)
• Central junction box (CJB) Fuses:
  • 202 (5A)
  • 213 (5A)
  • 217 (5A)
  • 220 (10A)
• Auxiliary junction box (AJB) Fuse(s):
  • 104 (15A)
• Damaged circuitry
• Damaged horn relay
• Loose or corroded connections
• Damaged air bag sliding contact (14A664)

Need a dealer for this part

If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

• check that the program card is correctly installed.

• check the connections to the vehicle.

• check the ignition switch position.

did you check the fuse box? take the cover off on fuse box and look what fuse correspond the to the horn and check if is good, if doesnt work also take your horn off and check it