Troubleshooting
296
Key
Problem
Possible cause/consequence Suggested solutions
You cannot lock or unlock the
vehicle using the key.
The key batteries are discharged
or nearly discharged.
X
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:
X
Unlock the vehicle using the emergency key element
(
Y
page 302).
X
Check the key batteries (
Y
page 305) and replace them if neces-
sary (
Y
page 305).
The key is faulty.
X
Unlock the vehicle using the emergency key element
(
Y
page 302).
X
Have the key checked at a qualified specialist workshop.
The battery charge indicator lamp
of the key does not go on during
the test.
The key batteries are discharged.
X
Change the batteries (
Y
page 305).
You have lost a key.
X
Have the key cancelled at a Mercedes-Benz Service Centre.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the manual locks changed too.
You have lost the emergency key
element.
X
Report the loss immediately to the vehicle insurers.
X
If necessary, have the manual locks changed too.
Practical advice
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