Code 21 - Beacon - Disconnected; Code 22 - Horn - Short Circuit - JLG 15MVL Series Service Maintenance Manual

Code 21 - Beacon - Disconnected

Check For These Obvious Conditions First:
• Is machine equipped with flashing amber beacon light.
STEP
1. Is machine equipped with a flashing amber beacon light.
2. At the Ground Control Module enter the programming mode, check if the
Beacon light open circuit detection is enabled.
3. Check voltage at the P1 connector on the Ground Control Module between
pin-12 and pin-5. Is reading within specification?
4. 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.

Code 22 - Horn - Short Circuit

Check For These Obvious Conditions First:
• Damaged wiring in the horn wiring harness or a damaged horn unit.
STEP
1. At the Ground Control Module, P1 connector, check the voltage across
pins-14 and 7 to the horn. Is reading within specification?
2. Remove the wire terminals at the horn, check continuity of each of the wires
from pins-14 and 7 on the P1 connector to the horn end.
3121231
Table 6-25. Code 21 - Beacon - Short Disconnected
ACTION
Table 6-26. Code 22 - Horn - Short Circuit
ACTION
– JLG Lift –
SECTION 6 - TROUBLESHOOTING
SPEC YES
— Go to Step 3
— Disable It
2 - 4 V DC Replace Ground
Control Module
— Replace the
Beacon
SPEC YES
0 - 2V DC Go to Step 2
— Replace the
Horn
NO
Got to Step 2
Replace Ground
Control Module
Go to Step 4
Repair or
Replace Wiring
NO
Replace Ground
Control Module
Repair or
Replace Wiring
6-27