Mercedes-Benz R-Class Owner's Manual page 302

Problem
The vehicle cannot be started
using the KEYLESS GO key and
the KEYLESS GO button. The KEY-
LESS GO key is in the vehicle.
You have lost the KEYLESS GO
key.
Trailer towing*
Problem
The ball coupling cannot be
locked.
The key cannot be removed from
the ball coupling.
* optional
Possible cause/consequence
A door is open. The key can there-
fore not be detected as easily.
You did not depress the brake
when starting the engine.
There is interference from a pow-
erful source of radio waves.
Possible cause/consequence
G Risk of accident
The ball coupling is dirty.
The trailer coupling is damaged.
Suggested solutions
Close the door and try to start the vehicle again.
X
Depress the brake and press the KEYLESS GO button.
X
Start your vehicle using the KEYLESS GO key in the ignition lock.
X
Have the KEYLESS GO key cancelled at a Mercedes-Benz Service
X
Centre.
Report the loss immediately to the vehicle insurers.
X
If necessary, have the manual locks changed too.
X
Suggested solutions
Remove the ball coupling and clean it (
X
pling still cannot be locked, remove the ball coupling. It must no
longer be used to tow a trailer, as safe operation is not guaranteed.
Have the entire trailer coupling checked at a qualified specialist
X
workshop.
Practical advice
Troubleshooting
page 248). If the ball cou-
Y
299
Z