Volvo 740 1990 Owner's Manual page 54

Volvo 1990 740 Model
To avoid battery drain
The interior light and the warning lights in the rear of the doors come on when a door is opened.
To avoid battery drain when the doors are opened for prolonged periods, these lights can be switched off
by pushing in and turning the door light switches slightly clockwise. When the door is closed the switch
will return to its normal position.
pg. 37 Child safety locks, Trunk lid (sedan)
The buttons are located on the rear door jambs.
A The door lock functions normally.
B The door cannot be opened from the inside.
Normal operation from outside.
WARNING!
Remember, in the event of an accident, the rear seat passengers cannot open the doors from the inside
with the buttons in position B .
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Child safety locks