Mercedes-Benz R-Class Owner's Manual page 308

Key or KEYLESS GO key*
Checking the batteries
Press the j or k button.
X
The batteries are in order if the battery
charge indicator lamp lights up briefly.
Changing the batteries
You require two CR 2025 3 V cell batteries.
Remove the emergency key element from
X
the key ( page 302).
Y
Emergency key element
1
Battery tray
2
* optional
Insert emergency key element
X
opening in the key and push in the direction
of the arrow.
Battery tray 2 is released.
Pull battery tray 2 out of the key.
X
Batteries
1
Remove old batteries 1 from the battery
X
tray.
Insert the new batteries beneath the con-
X
tact spring with the positive terminal facing
upwards. Use a lint-free cloth to do so.
Push the battery tray back into the key
X
housing until the battery tray engages.
Check the function of all key buttons on the
X
vehicle.
1 into the
Auxiliary heating* remote control
One 6V pin battery, type 2CR11108 is
required.
Battery
1
Battery cover
2
Prise apart the side arms of battery cover
X
2 and slide off battery cover 2.
Remove old battery 1.
X
Insert the new battery. Observe the polarity
X
signs on the back of the remote control
when doing so.
Slide battery cover
X
remote control.
Use the remote control to check the vehi-
X
cle's auxiliary heating functions.
Practical advice
Changing the batteries
2 back onto the
305
Z