1999 Plymouth Truck Voyager V6-3.8L Horn Will Not Sound Inspection

Check horn fuse 6 in the Power Distribution Center and fuse 7 in the Junction Block. If
fuse is blown refer to FUSE BLOWN. If fuse is OK, refer to FUSE OK.
Fuse Blown
1. Verify condition of battery terminals and voltage, refer to Battery If battery
connections and battery charge is OK proceed to Step 2.
2. Using a voltmeter, test for battery voltage at both sides of horn fuse 7. If voltage is
OK, on both sides of fuse, proceed to Fuse OK. If voltage is OK, on one side of
fuse, the fuse is blown, proceed to Step 3.
3. Using a suitable ammeter in place of the fuse, test amperage draw of the horn
circuit. If amperage draw is greater than 20 amps without the horn switch
depressed, a grounded circuit exists between the fuse and the horn relay Proceed to
Step 4. If amperage draw is greater than 20 amps with the horn switch depressed,
a grounded circuit exists between the horn relay and the horn. Proceed to step
Step 5.
4. Remove the horn relay from the Junction Block. If the amperage draw drops to 0
amps , the horn switch or circuit is shorted. If the amperage draw does not drop to 0
amps , repair short at the Junction Block.
5. Disengage a wire connector from one of the horns. If amperage drops and the
connected horn sounds, replace the faulty horn. If amperage does not drop with
both horns disconnected and the horn switch depressed, proceed to Step 6.
6. Using a continuity tester, with the horns disconnected test continuity of the X2
cavity of the horn relay to ground. If continuity is detected, the circuit is grounded
between the Junction Block and the horns. Locate and repair pinched harness.
Fuse OK
1. Remove the horn relay from the Junction Block.
2. Using a continuity tester, Depress horn switch and test continuity from the X3 cavity
of the horn relay to ground.
a. If continuity is detected, proceed to Step 3.
b. If NO continuity, proceed to Step 4.

Source