79
MicroController Control System Troubleshooting
PROBLEM 26
Horn does not function correctly. Lift and drive
operation normal.
POSSIBLE CAUSE
Open fuse; Faulty wiring; Defective horn switch;
Horn defect.
CHECKS
With the faulty horn circuit activated, check for
voltage on the load side of the horn fuse.
Battery voltage No voltage
Check for voltage on the load side of
the horn switch.
Battery voltage 0 volt
Repair or replace open wire going to battery
negative.
Replace horn.
Check for short circuits;
Replace horn fuse.
Check for continuity of wire #1
from horn.
Continuity No continuity
Repair or replace open wire from fuse
or replace defective switch.
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