i have a mb 230 ce (124c) '1988 and have a problem with the cenral lock device when a use the key it works fine on the trunk and both doors but the remote doesn't work,i replace the battery but still the same
Unless I'm wrong, I don't think ANY 124 came with a remote or keyless entry... so that must have been put in aftermarket. Would be really hard to diagnose from here. You'll need to find the keyless entry "brain" to diagnose.
I don't know about your wiper problem.