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Home >> Mercedes Benz >> 1993 >> 300SL Automatic >> Repair and Diagnosis >> Body & Frame >> Sun Roof/T-Top/Convertible Top >> Power Convertible Soft/Hard Tops & Roll Bar - 300SL, 500SL & 600SL >> Electrical Diagnostic Tests (Section 23) >> Soft Top Electrical Tests (Section 23.1) >> Valve Actuation (SECTION 25)

Valve Actuation (SECTION 25)

WARNING: Injury hazard from pinching and crushing, in extreme cases extremities can even be severed when caught in the mechanism. DO NOT allow any body parts to be in the general area of the moving components. DO NOT reach into the moving mechanism at any time during any tests. Keep away from the moving mechanism of components which are being activated using the Hand Held Tester (HHT) and or directly via circuit 30. Ensure that all test cables are of sufficient length.

For aid in testing and identifying valve blocks Y55, Y56 & Y57 refer to illustrations. See Fig 1 -Fig 7 .

Fig 1: Operational Sequence Valve Actuation Soft Top Opening
G00287516Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 2: Operational Sequence Valve Actuation Soft Top Closing
G00287517Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 3: Operational Sequence Valve Actuation Hard Top Locking (1 Of 2)
G00287518Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 4: Operational Sequence Valve Actuation Hard Top Locking (2 Of 2)
G00287519Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 5: Operational Sequence Valve Actuation Hard Top Unlocking
G00287520Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 6: Identifying Soft Top Left Side Valve Block (Y55)
G00287521Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig 7: Identifying Soft Top Right Side Valve Block (Y56) & Roll Bar Valve Block (Y57)
G00287522Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
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