...re. the sunroof again, there should be a nut-like thing right at the motor which is used with a socket to manually open or close the sunroof in the event the motor fails. If the tool kit is still there, it should have the right connector, or find a socket, then see if the roof can be opened/closed manually. This will tell you if there is a broken drive gear or cable (if there is, you'd be better off leaving that job to the last!)

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1986 560SL
2002 Toyota Camry
1993 Lexus