Honda GL1800 2004 Owner's Manual page 153

Suspension
Each MEMO button stores only one pre-load position. Storing a new position
erases the previous setting stored in that button's memory. If you want to add a
new position while retaining the current one, use the other memory button.
All stored pre-load positions will be lost if your motorcycle's battery goes dead
or is disconnected.
When ''SUS ADJ ERROR'' blinks on the display, contact your Honda dealer.
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Servicing Your Honda