Suzuki DL650K5 Service Manual page 393

ELECTRICAL SYSTEM 8-31
ODOMETER
The odometer indicates "------" when the odometer is faulty.
Replace the combination meter unit with a new one.
TRIP METER
The trip meter indicates "----.-" when the trip meter is faulty.
In case the odometer works normaly, perform the trip meter
reset. If the trip meter isn't restored after above reset, replace
the combination meter unit with a new one.
TRIP METER RESET PROCEDURE
1. Turn the ignition "ON".
2. Select the trip meter by pushing the SEL switch A.
3. Push the ADJ switch B for 2 seconds.