Mercedes-Benz S 320 CDI, Owner'S Manual, Page: 510 / 588

488
Practical advice
Troubleshooting
Key
Problem Possible cause/consequence Suggested solutions
You cannot lock or unlock the vehicle us-
ing the key.
The key batteries are discharged or nearly
discharged.
왘
Point the tip of the key at the driver’s
door handle at close range and try to
open the vehicle again.
If this does not work:
왘
Unlock or lock the vehicle using the
emergency key element (
컄
page 495).
왘
Check the key batteries (
컄
page 251)
and change them if necessary
(
컄
page 499).
The key is faulty.
왘
Unlock or lock the vehicle using the
emergency key element (
컄
page 495).
왘
Have the key checked at a qualified spe-
cialist workshop.