Hi there, 1986 560SEL, my door locks act like the following:


Use the key in the trunk to unlock and lock everything, all the other doors unlock and lock fine except the driver's door stays locked.

Use the key in the passenger door to unlock and lock everything, all the other doors unlock and lock fine except the driver's door stays locked.

Use an aftermarket keyless entry (which was installed for years and worked for years and still does), it unlocks and locks the trunk and all other doors except the driver's door stays locked.

Use the key in the driver's door to unlock and lock everything, all the other doors unlock and lock fine as does the driver's door.


What say you?