560SL (107.048) V8-5.6L (117.967) (1989)
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Switch on ignition.
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Press the start button for between 2 and 4 s.
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Display 1 means no fault in the system. If another number appears, rectify the fault in accordance with the fault-finding flow diagram. See:
Restraint Systems/Testing and Inspection/Component Tests and General Diagnostics