E320 Yr 2000, S430 YR 2002
My trunk lid on S430 MY 2002 has been playing up -- sometimes staying locked, other times not locking completely. I was able to open the lid with the mechanical key ( with considerable difficulty ). But I noticed a hissing sound.The doors do not self-close anymore but can be closed and opened with the remote key -- unlike the trunk. Once I remove the trunk lining, I can see the vacuum pump and locking mechanism. How can I tell if the central locking vacuum pump is faulty or just something to do with the trunk locking mechanism ? Are there any DIY with pictures for diagnosing and fixing the trunk lock mechanism ?