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R129 SL Soft Top Problem Overview

R129 SL Soft Top Problem Overview

Posted by Carl Burgess on 1st Aug 2018

Are you having R129 soft top problems? It may be stuck, or it won't close, won't reset, needs manually opening, or you think your controller needs fixing? Soft Top Mayhem! Problems with raising and lowering soft top roofs can be frustrating and feel illogical at times. It is one of our most requested diagnoses for the R129. The hydraulic and electrical system to achieve this is beautifully engineered (in my view) and, as such, any issues can be addressed using a methodical approach. A set of micro switches, locks and hydraulic valves must all function well in turn to allow the next process of motion. It's not always immediately obvious whether the roof control unit is at fault, or one of the above components. The first step Look at fault codes if present. Early models will need a flash code reader. On later models, STAR diagnosis may be required. Next steps It's fairly simple to test the switch function with a meter, by manually opening and closing the locks indiv
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