E2006 e350 19k
battery dead, trunk will not open for battery in trunk, used the long metal key in key fob, its in the big key where the key fob battery, move side on end pull out, and push in key lock at lic plate turn pull up trunk open replace battery, no radio code have
aux battery in engine right side rear, under a/c filter

FIND YOUR VACUUM PUMP AND MAY HAVE TO REPLACE THE VACUUM PUMP
OR PULL PUMP OUT AND MAY NEED JUST OIL ON THE SHAFT BEARING, USE
12 VOLTS FOR TEST, WHAT YEAR GO TO THIS SITE FOR PRICE

MOVE THE TRUNK LID UP AND DOWN, HARD MAY OPEN, LOW VACUUM FROM
PUMP, GO TO PUMP CHECK VACUUM OUTPUT USE HAND VACUUM PUMP TO
OPEN, MAY HAVE VACUUM LEAK IN LOCKING OF ALL DOORS , I HAD A LEAK
AT FUEL DOOR COVER LOCK, OVER NIGHT , REPLACE VACUUM VALVE AT
FUEL COVER THIS IS ON A 300D