How do you reset alarm on 85 Mercedes 500 sel?

To reset the alarm on a 1985 Mercedes 500 SEL, first, unlock the vehicle using the key in the driver's door. Then, insert the key into the ignition and turn it to the "On" position without starting the engine. If the alarm is still active, disconnect the battery for a few minutes before reconnecting it, which should reset the alarm system. Finally, ensure all doors are closed properly to prevent the alarm from reactivating.