Code 19 - Alarm - Disconnected; Code 20 - Beacon - Short Circuit - JLG 15MVL Series Service Maintenance Manual

SECTION 6 - TROUBLESHOOTING

Code 19 - Alarm - Disconnected

Check For These Obvious Conditions First:
• Damaged wiring in the alarm wiring harness or a damaged alarm.
• Activate a function to check if alarm beeps.
STEP
1. Check voltage at the P1 connector on the Ground Control Module between
pin-13 and pin-6. Is reading within specification?
2. Remove the wire terminals at the alarm, check continuity of each of the
wires from pins 13 and 6 on the P1 connector to the alarm end.

Code 20 - Beacon - Short Circuit

Check For These Obvious Conditions First:
• Damaged wiring in the beacon wiring harness or a damaged beacon unit.
STEP
1. At the Ground Control Module, P1 connector, check the voltage across
pins-12 and 5 to the beacon. Is reading within specification?
2. Remove the wire terminals at the beacon, check continuity of each of the
wires from pins 12 and 5 on the P1 connector to the beacon end.
6-26
Table 6-23. Code 19 - Alarm - Disconnected
ACTION
Table 6-24. Code 20 - Beacon - Short Circuit
ACTION
– JLG Lift –
SPEC YES
2 - 4V DC Replace Ground
Control Module
— Replace the Alarm
SPEC YES
0 - 2V DC Go to Step 2
— Replace the
Beacon
NO
Go to Step 2
Repair or
Replace Wiring
NO
Replace Ground
Control Module
Repair or
Replace Wiring
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