Can someone tell me how to unlock the storage compartments in the doors and behind the seats? My jumper cables and owner's manual are in the rear storage compartments but I can't get them to unlock.

Try locking/unlocking the car a few times. On a 129, the door pockets, glove box, eyeglass compartment, center console, and rear compartments are all part of the central locking system. It's possible that one of the actuators is stuck. This feature allows some measure of security if the car is left unattended with the top open.

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ILUVMILS
MB Shop Foreman
MB Master Technician
MB Master Guild Tehnician 2007
Factory trained in NJ, PA, AL, CA, FLA,
and Germany
29 years and counting!

1994 E320 (wrecked)
2001 E320
2005 C240 4Matic Wagon
2000 E320
2000 ML320