Honda GL1800 2004 Owner's Manual page 23

Gauges & Indicators
Lamp Check
Most of the indicator lights come on when you turn the ignition switch ON so
you can check that they are working. Some indicators turn off after a few
seconds; other remain on until or after the engine is started. The ABS indicator
remains on until your motorcycle begins moving. All indicators are identified on
the following pages with the words: Lamp Check.
If one of these indicators does not come on when it should, have your Honda
dealer check for burned-out bulbs or other problems.
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Instruments & Controls