There is a "red fische" bulletin to MB dealers on this subject!! The combination relay can have a mind of it's own & keep the lamp on.
The topic number is 82A92111 on the old red fische!
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)