Having access to the biggest USA workshop live hotline databases, I will publish them here and might help some.

Customer Concern: Hard top does not function
Average Reported Mileage: 75673

Tests/Procedures:
1. Inspect for obvious damage to trunk hinges, luggage coverings, latches, and misalignments. Repair as needed. If side flaps are stuck or out of time, perform bulletin LI77.33-P-053085. Bulletin and pictures are attached under Related Documents.

2. Connect factory compatible scan tool and perform a complete system test. It is possible that faults in other control units not directly connected to the hard top to prevent operation.

3. Depending on Diagnostic Trouble Codes (DTC) found in control unit for the hard top. Perform testing per guided tests via scan tool. See the Diag information attached under Related Documents.

4. Without scan tool, perform operation of roof. If top goes into fault mode right away, you need a scan tool. If the top does not go into fault mode, listen for pump operation.

5. Pump is located in lower left corner of trunk. Check for bypass valve on pump being open. If pump does not run, inspect for blown fuse or faulty relay to pump. Tech Tips: Always check for updated service bulletins. New pumps come with bypass valve in the open position. Close valve before functioning roof. See Related Documents for manual operation for closing roof.

Tech Tips: Always check for updated service bulletins. New pumps come with bypass valve in the open position. Close valve before functioning roof. See Related Documents for manual operation for closing roof.


Confirmed Fix
7 - Replaced Convertible Top Hydraulic Pump
5 - Replaced Convertible Top Hydraulic Cylinder(s)
2 - Replaced Convertible Top Flap Assembly
2 - Replaced/Repaired Side Flaps Motor
2 - Replaced Convertible Top Micro Switch S117
2 - Replaced Load Compartment Limit Switch
1 - Replaced Hard Top Latch
1 - Replaced Convertible Top Hydraulic Pump Relay
1 - Repaired Convertible Top Flap Assembly and Replaced Convertible Top Hydraulic Pump Relay
1 - Aligned Convertible Top
1 - Repaired Roll Bar Hydraulic Cylinder

Confirmed Fix Details

Tech Reported Fix Details Confirmed Fix

1
October 23, 2019 2004 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump Replaced Convertible Top Hydraulic Pump

2
September 15, 2016 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump Replaced Convertible Top Hydraulic Pump

3
June 7, 2016 2005 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump Replaced Convertible Top Hydraulic Pump

4
April 2, 2016 2005 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump
- Pump was blowing the fuse.

27,500 miles Replaced Convertible Top Hydraulic Pump

5
May 28, 2014 2004 Mercedes-Benz SL600, 5.5L, V12, MFI, USA *
Convertible Top Hydraulic Pump
53,237 miles Replaced Convertible Top Hydraulic Pump

6
January 17, 2014 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump
132,000 miles Replaced Convertible Top Hydraulic Pump

7
October 10, 2013 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Pump
130,000 miles Replaced Convertible Top Hydraulic Pump

1
October 3, 2016 2004 Mercedes-Benz CLK500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Cylinder(s)
- Found leak at top actuating hydraulic cylinder. Do not try any fluid besides Mercedes top fluid, as further leaks will result. Replaced cylinders, top operating normal.
Replaced Convertible Top Hydraulic Cylinder(s)

2
May 31, 2015 2005 Mercedes-Benz CLK500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Cylinder(s)
- LEft main actuator leaking. Replaced.
Replaced Convertible Top Hydraulic Cylinder(s)

3
September 20, 2019 2005 Mercedes-Benz SL600, 5.5L, V12, MFI, USA *
Convertible Top Hydraulic Cylinder(s)
38,500 miles Replaced Convertible Top Hydraulic Cylinder(s)

4
January 20, 2019 2005 Mercedes-Benz CLK500, 5.0L, V8, MFI, USA *
Convertible Top Hydraulic Cylinder(s) Replaced Convertible Top Hydraulic Cylinder(s)

5
September 6, 2016 2006 Mercedes-Benz SL500, 5.0L, V8, Des 113.963, USA *
Convertible Top Hydraulic Cylinder(s) Replaced Convertible Top Hydraulic Cylinder(s)

1
December 20, 2015 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Flap Assembly Replaced Convertible Top Flap Assembly

2
October 17, 2015 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Flap Assembly
138,000 miles Replaced Convertible Top Flap Assembly

1
November 29, 2017 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Micro Switch S117
88,000 miles Replaced Convertible Top Micro Switch S117

2
December 10, 2016 2004 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Micro Switch S117
50,000 miles Replaced Convertible Top Micro Switch S117

1
March 21, 2018 2005 Mercedes-Benz SL600, 5.5L, V12, MFI, USA *
Load Compartment Limit Switch Replaced Load Compartment Limit Switch

2
October 18, 2016 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Load Compartment Limit Switch Replaced Load Compartment Limit Switch

1
February 12, 2016 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Side Flaps Motor
61,000 miles Replaced Side Flaps Motor

2
August 27, 2014 2005 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Side Flaps Motor
- One of the flaps was up and the other was stuck down.
62,000 miles Repaired Side Flaps Motor

1
February 16, 2016 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top
- The frame was bent. Repositioned the top frame and the top functioned.
77,000 miles Aligned Convertible Top

1
December 28, 2015 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Convertible Top Flap Assembly
Convertible Top Hydraulic Pump Relay
Convertible Top Hydraulic Pump Relay Repaired Convertible Top Flap Assembly and Replaced Convertible Top Hydraulic Pump Relay

1
April 27, 2015 2009 Mercedes-Benz SL550, 5.5L, V8, USA
Convertible Top Hydraulic Pump Relay
Convertible Top Hydraulic Pump Relay
30,250 miles Replaced Convertible Top Hydraulic Pump Relay

1
May 1, 2018 2003 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Hard Top Latch
- the convertible top latch was leaking
Replaced Hard Top Latch

1
March 17, 2018 2005 Mercedes-Benz SL500, 5.0L, V8, MFI, USA *
Roll Bar Hydraulic Cylinder
- Roll bar hydraulic ram was disconnected

 

It's my experience that if the roof was in motion and quit due to an anomaly, then a code will be stored in the roof controller. But otherwise there are no codes, and that encompasses most cases. With no codes you look at the state of the limit switch inputs to the roof controller and look for one in the wrong position. If those are fine, you might check for a faulty cylinder having an internal leak. Both of these procedures have been detailed thoroughly in the recent past and will not be repeated here.