JLG 400S Operation Manual page 51

7. System Distress Indicator
The light indicates that the JLG Control System
has detected an abnormal condition and a
Diagnostic Trouble Code has been set in the
system memory. Refer to the Service Manual for instructions
concerning the trouble codes and trouble code retrieval.
The system distress indicator light will illuminate for 2-3 sec-
onds when the key is positioned to the on position to act as
a self test.
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SECTION 3 - MACHINE CONTROLS AND INDICATORS
8. Platform Overload Indicator (If Equipped)
Indicates the platform has been overloaded.
9. Drive and Steer Disable Indicator (If Equipped)
Indicates the Drive and Steer Disable function
has been activated.
– JLG Lift – 3-11