Mercedes-Benz R-Class Owner's Manual page 301

Practical advice
Troubleshooting
KEYLESS GO*
Problem
You cannot lock or unlock the
vehicle using the KEYLESS GO
key.
The battery check lamp in the
KEYLESS GO key does not light
up when tested.
298
Possible cause/consequence
The KEYLESS GO key batteries
are discharged or nearly dis-
charged.
There is a fault with KEYLESS GO.
There is interference from a pow-
erful source of radio waves.
The KEYLESS GO key batteries
are discharged.
Suggested solutions
Lock or unlock the vehicle using the remote control function of the
X
key. To do this, point the tip of the key at the driver's door handle
from close range and try to unlock or lock the vehicle again.
If this does not work:
Unlock the vehicle using the emergency key element
X
( page 302).
Y
Check the KEYLESS GO key batteries (
X
them if necessary ( page 305).
Y
Lock or unlock the vehicle using the remote control function of the
X
key. To do this, point the tip of the key at the driver's door handle
from close range and try to open the vehicle again.
Have the KEYLESS GO key checked at a qualified specialist work-
X
shop.
Unlock the vehicle using the emergency key element
X
( page 302).
Y
Change the batteries ( page 305).
X
Y
page 305) and replace
Y
* optional