Requirements:
R
ACR20323Vcell battery
Mercedes-Benzrecommends that youhave the
batteryreplaced by aqualified specialistwork‐
shop.
#
Remove theemergency key(/page43).
Example image
#
Press release button 2 down fullyand slide
cover 1 forward.
#
Remove batterycompartment 3 and remove
thedischargedbattery.
#
Insertthe newbatteryintobatterycompart‐
ment 3.Observe thepositivepole marking
in thebatterycompartmentand on thebat‐
tery.
#
Insertbatterycompartment 3.
#
Replace cover 1 so that it engages.
#
Slidethe emergency keyincompletely until it
engages(/page43).
Problems with thekey
Problem
Possible causes/consequences and MM Solutions
Youcannotlockorunlock
thevehicle anymore.
Possible causes:
R
thekey battery is weak or discharged
R
thereisinterference from apowerful source of radio waves
R
thekey is defective
#
Checkthe batteryusing thebatterychecklampand replace if neces‐
sary(/page43).
#
Use theemergency keytounlock and lockthe vehicle (/ page43).
#
Have thekey checkedataqualified specialistworkshop.
Youhave lostakey.
#
Have thekey deactivatedataqualified specialistworkshop.
#
If necessary, have themechanical locks replaced.
44
Opening and closing