Mercedes-Benz A Series 2015 Owner's Manual page 90

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Problems with the key
Problem
You cannot lock or
unlock the vehicle
using the key.
You can no longer lock
or unlock the vehicle
using KEYLESS-GO.
Possible causes/consequences and M M Solutions
The key battery is discharged or nearly discharged.
Vehicles without KEYLESS-GO or KEYLESS-GO start func-
X
tion: try again to lock/unlock the vehicle using the remote con-
trol function of the key. Point the tip of the key at the driver's
door handle from close range and press the % or & but-
ton.
If this does not work:
Check the key battery (
X
(
page 86).
Y
Lock (
page 91) or unlock (
X
Y
emergency key element.
There is interference from a powerful source of radio waves.
Vehicles without KEYLESS-GO or KEYLESS-GO start func-
X
tion: try again to lock/unlock the vehicle using the remote con-
trol function of the key. Point the tip of the key at the driver's
door handle from close range and press the % or & but-
ton.
If this does not work:
Lock (
page 91) or unlock (
X
Y
emergency key element.
The key is faulty.
Lock (
page 91) or unlock (
X
Y
emergency key element.
Have the key checked at a qualified specialist workshop.
X
The key battery is discharged or nearly discharged.
Check the key battery (
X
(
page 86).
Y
If this does not work:
Lock (
page 91) or unlock (
X
Y
emergency key element.
There is interference from a powerful source of radio waves.
Lock (
page 91) or unlock (
X
Y
emergency key element.
page 86) and replace it if necessary
Y
page 92) the vehicle using the
Y
page 92) the vehicle using the
Y
page 92) the vehicle using the
Y
page 86) and replace it if necessary
Y
page 92) the vehicle using the
Y
page 92) the vehicle using the
Y
Key
87
Z

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