Hello, I have a 1989 560sl. The seat belt light will not exstinguish. I have checked the wiring to the seats and found them in good condition. The only time is turns off is when the door is open. Does anyone know where the relay is located? Any ideas as to the problem? Thanks

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1989 560SL
1986 300SDL
1983 300D (Burning Jet-A)
1982 240D
1995 S600