Mercedes-Benz B-Class, Owner'S Manual

Page: 87 / 537

#
Press release knob 2 down fully and slide
cover 1 in the direction of the arrow.
#
Fold out cover 1 in the direction of the arrow
and remove.
#
Remove battery compartment 3 and take
out the discharged battery.
#
Insert the new battery into battery compart-
ment 3 . Observe the positive pole marking in
the battery compartment and on the battery
when doing this.
#
Push in battery compartment 3 .
#
Re-attach cover 1 and push it until it
engages.
Pr Problems wit oblems with t h the key he key, tr , troubleshoo oubleshooting ting
YYou can no long ou can no longer loc er lock or unloc k or unlock t k the v he vehicle ehicle
Possible causes:
R
The key battery is weak or discharged.
#
Check the battery using the indicator lamp
(
/
page 81).
#
Replace the key battery, if necessary
(
/
page 83).
#
Use the replacement key.
#
Use the emergency key to lock or unlock
(
/
page 88).
#
Have the key checked at a quali ed specialist
workshop.
Ther There is int e is interf erfer erence fr ence from a pow om a power erful r ful radio signal adio signal
sour source ce
Possible causes if the function of the key is
impaired:
R
high voltage power lines
R
mobile phones
R
electronic devices (notebooks, tablets)
R
shielding due to metal objects or induction
loops for electrical gate systems or automatic
barriers
#
Make sure that there is su cient distance
between the key and the potential source of
interference.
YYou hav ou have los e lost a key t a key
#
Have the key deactivated at a quali ed spe-
cialist workshop.
#
If necessary, have the mechanical lock
replaced as well.
Doors Doors
NNoottes on t es on the additional door lock he additional door lock
The additional door lock is only available for vehi-
cles for the United Kingdom.
84 84 Opening and closing