Komatsu PC200-8M0 Shop Manual page 869

400 Troubleshooting of electrical system (E-mode)
E-24 Horn does not sound or does not stop
Cause
Defective horn
8
(internal defect)
Failure 2) Horn does not stop sounding.
Related infor-
mation
Cause
Defective horn relay (R08)
1
(internal open or short circuit)
Hot short circuit in wiring harness
2
(contact with 24 V circuit)
Circuit diagram related to horn
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
If no failure is found by above checks, horn may be defective.
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Remove horn relay (connector R08).
3. Turn starting switch to ON position.
If horn stops sounding, original horn relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect connectors M07 and M08, and connect T-adapters to each
female side.
3. Turn starting switch to ON position.
Between M07 (female) (2) and (1)
Between M08 (female) (2) and (1)
SEN06138-00
Voltage Max. 1 V
Voltage Max. 1 V
47
40-400