If it starts and runs for about a half second or appears to run for that long then you probably just lost your key sync. Also happens when the remote battery dies on you. Look in your owners manual near the back or in the index for resyncing your key. It is easy to do and takes a few minutes or a few tries. Or you can spend about oh $200 for the Benz stealership to do it for you ;-]
SOURCE: Mercedes slk roof problem
hi,seem only adjustment of micro switch,but you need a tester(handheld tster) only a dealer have,
SOURCE: 1999 mercedes benz slk hard top some times wont
Most likely the relay, located beside the motor is faulty. The contacts get sticky. The relay is about 30.00. Take the plastic cover off the motor and you will see the relay. Its a standard type so most decent shops will have them.
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